Adding upstream version 6.4.3+dfsg1.upstream/6.4.3+dfsg1

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 4344 insertions, 0 deletions

diff --git a/wp-includes/theme.php b/wp-includes/theme.php
new file mode 100644
index 0000000..89fccdd
--- /dev/null
+++ b/wp-includes/theme.php
@@ -0,0 +1,4344 @@
+<?php
+/**
+ * Theme, template, and stylesheet functions.
+ *
+ * @package WordPress
+ * @subpackage Theme
+ */
+
+/**
+ * Returns an array of WP_Theme objects based on the arguments.
+ *
+ * Despite advances over get_themes(), this function is quite expensive, and grows
+ * linearly with additional themes. Stick to wp_get_theme() if possible.
+ *
+ * @since 3.4.0
+ *
+ * @global array $wp_theme_directories
+ *
+ * @param array $args {
+ *     Optional. The search arguments.
+ *
+ *     @type mixed $errors  True to return themes with errors, false to return
+ *                          themes without errors, null to return all themes.
+ *                          Default false.
+ *     @type mixed $allowed (Multisite) True to return only allowed themes for a site.
+ *                          False to return only disallowed themes for a site.
+ *                          'site' to return only site-allowed themes.
+ *                          'network' to return only network-allowed themes.
+ *                          Null to return all themes. Default null.
+ *     @type int   $blog_id (Multisite) The blog ID used to calculate which themes
+ *                          are allowed. Default 0, synonymous for the current blog.
+ * }
+ * @return WP_Theme[] Array of WP_Theme objects.
+ */
+function wp_get_themes( $args = array() ) {
+	global $wp_theme_directories;
+
+	$defaults = array(
+		'errors'  => false,
+		'allowed' => null,
+		'blog_id' => 0,
+	);
+	$args     = wp_parse_args( $args, $defaults );
+
+	$theme_directories = search_theme_directories();
+
+	if ( is_array( $wp_theme_directories ) && count( $wp_theme_directories ) > 1 ) {
+		/*
+		 * Make sure the active theme wins out, in case search_theme_directories() picks the wrong
+		 * one in the case of a conflict. (Normally, last registered theme root wins.)
+		 */
+		$current_theme = get_stylesheet();
+		if ( isset( $theme_directories[ $current_theme ] ) ) {
+			$root_of_current_theme = get_raw_theme_root( $current_theme );
+			if ( ! in_array( $root_of_current_theme, $wp_theme_directories, true ) ) {
+				$root_of_current_theme = WP_CONTENT_DIR . $root_of_current_theme;
+			}
+			$theme_directories[ $current_theme ]['theme_root'] = $root_of_current_theme;
+		}
+	}
+
+	if ( empty( $theme_directories ) ) {
+		return array();
+	}
+
+	if ( is_multisite() && null !== $args['allowed'] ) {
+		$allowed = $args['allowed'];
+		if ( 'network' === $allowed ) {
+			$theme_directories = array_intersect_key( $theme_directories, WP_Theme::get_allowed_on_network() );
+		} elseif ( 'site' === $allowed ) {
+			$theme_directories = array_intersect_key( $theme_directories, WP_Theme::get_allowed_on_site( $args['blog_id'] ) );
+		} elseif ( $allowed ) {
+			$theme_directories = array_intersect_key( $theme_directories, WP_Theme::get_allowed( $args['blog_id'] ) );
+		} else {
+			$theme_directories = array_diff_key( $theme_directories, WP_Theme::get_allowed( $args['blog_id'] ) );
+		}
+	}
+
+	$themes         = array();
+	static $_themes = array();
+
+	foreach ( $theme_directories as $theme => $theme_root ) {
+		if ( isset( $_themes[ $theme_root['theme_root'] . '/' . $theme ] ) ) {
+			$themes[ $theme ] = $_themes[ $theme_root['theme_root'] . '/' . $theme ];
+		} else {
+			$themes[ $theme ] = new WP_Theme( $theme, $theme_root['theme_root'] );
+
+			$_themes[ $theme_root['theme_root'] . '/' . $theme ] = $themes[ $theme ];
+		}
+	}
+
+	if ( null !== $args['errors'] ) {
+		foreach ( $themes as $theme => $wp_theme ) {
+			if ( $wp_theme->errors() != $args['errors'] ) {
+				unset( $themes[ $theme ] );
+			}
+		}
+	}
+
+	return $themes;
+}
+
+/**
+ * Gets a WP_Theme object for a theme.
+ *
+ * @since 3.4.0
+ *
+ * @global array $wp_theme_directories
+ *
+ * @param string $stylesheet Optional. Directory name for the theme. Defaults to active theme.
+ * @param string $theme_root Optional. Absolute path of the theme root to look in.
+ *                           If not specified, get_raw_theme_root() is used to calculate
+ *                           the theme root for the $stylesheet provided (or active theme).
+ * @return WP_Theme Theme object. Be sure to check the object's exists() method
+ *                  if you need to confirm the theme's existence.
+ */
+function wp_get_theme( $stylesheet = '', $theme_root = '' ) {
+	global $wp_theme_directories;
+
+	if ( empty( $stylesheet ) ) {
+		$stylesheet = get_stylesheet();
+	}
+
+	if ( empty( $theme_root ) ) {
+		$theme_root = get_raw_theme_root( $stylesheet );
+		if ( false === $theme_root ) {
+			$theme_root = WP_CONTENT_DIR . '/themes';
+		} elseif ( ! in_array( $theme_root, (array) $wp_theme_directories, true ) ) {
+			$theme_root = WP_CONTENT_DIR . $theme_root;
+		}
+	}
+
+	return new WP_Theme( $stylesheet, $theme_root );
+}
+
+/**
+ * Clears the cache held by get_theme_roots() and WP_Theme.
+ *
+ * @since 3.5.0
+ * @param bool $clear_update_cache Whether to clear the theme updates cache.
+ */
+function wp_clean_themes_cache( $clear_update_cache = true ) {
+	if ( $clear_update_cache ) {
+		delete_site_transient( 'update_themes' );
+	}
+	search_theme_directories( true );
+	foreach ( wp_get_themes( array( 'errors' => null ) ) as $theme ) {
+		$theme->cache_delete();
+	}
+}
+
+/**
+ * Whether a child theme is in use.
+ *
+ * @since 3.0.0
+ *
+ * @return bool True if a child theme is in use, false otherwise.
+ */
+function is_child_theme() {
+	return get_template_directory() !== get_stylesheet_directory();
+}
+
+/**
+ * Retrieves name of the current stylesheet.
+ *
+ * The theme name that is currently set as the front end theme.
+ *
+ * For all intents and purposes, the template name and the stylesheet name
+ * are going to be the same for most cases.
+ *
+ * @since 1.5.0
+ *
+ * @return string Stylesheet name.
+ */
+function get_stylesheet() {
+	/**
+	 * Filters the name of current stylesheet.
+	 *
+	 * @since 1.5.0
+	 *
+	 * @param string $stylesheet Name of the current stylesheet.
+	 */
+	return apply_filters( 'stylesheet', get_option( 'stylesheet' ) );
+}
+
+/**
+ * Retrieves stylesheet directory path for the active theme.
+ *
+ * @since 1.5.0
+ * @since 6.4.0 Memoizes filter execution so that it only runs once for the current theme.
+ * @since 6.4.2 Memoization removed.
+ *
+ * @return string Path to active theme's stylesheet directory.
+ */
+function get_stylesheet_directory() {
+	$stylesheet     = get_stylesheet();
+	$theme_root     = get_theme_root( $stylesheet );
+	$stylesheet_dir = "$theme_root/$stylesheet";
+
+	/**
+	 * Filters the stylesheet directory path for the active theme.
+	 *
+	 * @since 1.5.0
+	 *
+	 * @param string $stylesheet_dir Absolute path to the active theme.
+	 * @param string $stylesheet     Directory name of the active theme.
+	 * @param string $theme_root     Absolute path to themes directory.
+	 */
+	return apply_filters( 'stylesheet_directory', $stylesheet_dir, $stylesheet, $theme_root );
+}
+
+/**
+ * Retrieves stylesheet directory URI for the active theme.
+ *
+ * @since 1.5.0
+ *
+ * @return string URI to active theme's stylesheet directory.
+ */
+function get_stylesheet_directory_uri() {
+	$stylesheet         = str_replace( '%2F', '/', rawurlencode( get_stylesheet() ) );
+	$theme_root_uri     = get_theme_root_uri( $stylesheet );
+	$stylesheet_dir_uri = "$theme_root_uri/$stylesheet";
+
+	/**
+	 * Filters the stylesheet directory URI.
+	 *
+	 * @since 1.5.0
+	 *
+	 * @param string $stylesheet_dir_uri Stylesheet directory URI.
+	 * @param string $stylesheet         Name of the activated theme's directory.
+	 * @param string $theme_root_uri     Themes root URI.
+	 */
+	return apply_filters( 'stylesheet_directory_uri', $stylesheet_dir_uri, $stylesheet, $theme_root_uri );
+}
+
+/**
+ * Retrieves stylesheet URI for the active theme.
+ *
+ * The stylesheet file name is 'style.css' which is appended to the stylesheet directory URI path.
+ * See get_stylesheet_directory_uri().
+ *
+ * @since 1.5.0
+ *
+ * @return string URI to active theme's stylesheet.
+ */
+function get_stylesheet_uri() {
+	$stylesheet_dir_uri = get_stylesheet_directory_uri();
+	$stylesheet_uri     = $stylesheet_dir_uri . '/style.css';
+	/**
+	 * Filters the URI of the active theme stylesheet.
+	 *
+	 * @since 1.5.0
+	 *
+	 * @param string $stylesheet_uri     Stylesheet URI for the active theme/child theme.
+	 * @param string $stylesheet_dir_uri Stylesheet directory URI for the active theme/child theme.
+	 */
+	return apply_filters( 'stylesheet_uri', $stylesheet_uri, $stylesheet_dir_uri );
+}
+
+/**
+ * Retrieves the localized stylesheet URI.
+ *
+ * The stylesheet directory for the localized stylesheet files are located, by
+ * default, in the base theme directory. The name of the locale file will be the
+ * locale followed by '.css'. If that does not exist, then the text direction
+ * stylesheet will be checked for existence, for example 'ltr.css'.
+ *
+ * The theme may change the location of the stylesheet directory by either using
+ * the {@see 'stylesheet_directory_uri'} or {@see 'locale_stylesheet_uri'} filters.
+ *
+ * If you want to change the location of the stylesheet files for the entire
+ * WordPress workflow, then change the former. If you just have the locale in a
+ * separate folder, then change the latter.
+ *
+ * @since 2.1.0
+ *
+ * @global WP_Locale $wp_locale WordPress date and time locale object.
+ *
+ * @return string URI to active theme's localized stylesheet.
+ */
+function get_locale_stylesheet_uri() {
+	global $wp_locale;
+	$stylesheet_dir_uri = get_stylesheet_directory_uri();
+	$dir                = get_stylesheet_directory();
+	$locale             = get_locale();
+	if ( file_exists( "$dir/$locale.css" ) ) {
+		$stylesheet_uri = "$stylesheet_dir_uri/$locale.css";
+	} elseif ( ! empty( $wp_locale->text_direction ) && file_exists( "$dir/{$wp_locale->text_direction}.css" ) ) {
+		$stylesheet_uri = "$stylesheet_dir_uri/{$wp_locale->text_direction}.css";
+	} else {
+		$stylesheet_uri = '';
+	}
+	/**
+	 * Filters the localized stylesheet URI.
+	 *
+	 * @since 2.1.0
+	 *
+	 * @param string $stylesheet_uri     Localized stylesheet URI.
+	 * @param string $stylesheet_dir_uri Stylesheet directory URI.
+	 */
+	return apply_filters( 'locale_stylesheet_uri', $stylesheet_uri, $stylesheet_dir_uri );
+}
+
+/**
+ * Retrieves name of the active theme.
+ *
+ * @since 1.5.0
+ *
+ * @return string Template name.
+ */
+function get_template() {
+	/**
+	 * Filters the name of the active theme.
+	 *
+	 * @since 1.5.0
+	 *
+	 * @param string $template active theme's directory name.
+	 */
+	return apply_filters( 'template', get_option( 'template' ) );
+}
+
+/**
+ * Retrieves template directory path for the active theme.
+ *
+ * @since 1.5.0
+ * @since 6.4.0 Memoizes filter execution so that it only runs once for the current theme.
+ * @since 6.4.1 Memoization removed.
+ *
+ * @return string Path to active theme's template directory.
+ */
+function get_template_directory() {
+	$template     = get_template();
+	$theme_root   = get_theme_root( $template );
+	$template_dir = "$theme_root/$template";
+
+	/**
+	 * Filters the active theme directory path.
+	 *
+	 * @since 1.5.0
+	 *
+	 * @param string $template_dir The path of the active theme directory.
+	 * @param string $template     Directory name of the active theme.
+	 * @param string $theme_root   Absolute path to the themes directory.
+	 */
+	return apply_filters( 'template_directory', $template_dir, $template, $theme_root );
+}
+
+/**
+ * Retrieves template directory URI for the active theme.
+ *
+ * @since 1.5.0
+ *
+ * @return string URI to active theme's template directory.
+ */
+function get_template_directory_uri() {
+	$template         = str_replace( '%2F', '/', rawurlencode( get_template() ) );
+	$theme_root_uri   = get_theme_root_uri( $template );
+	$template_dir_uri = "$theme_root_uri/$template";
+
+	/**
+	 * Filters the active theme directory URI.
+	 *
+	 * @since 1.5.0
+	 *
+	 * @param string $template_dir_uri The URI of the active theme directory.
+	 * @param string $template         Directory name of the active theme.
+	 * @param string $theme_root_uri   The themes root URI.
+	 */
+	return apply_filters( 'template_directory_uri', $template_dir_uri, $template, $theme_root_uri );
+}
+
+/**
+ * Retrieves theme roots.
+ *
+ * @since 2.9.0
+ *
+ * @global array $wp_theme_directories
+ *
+ * @return array|string An array of theme roots keyed by template/stylesheet
+ *                      or a single theme root if all themes have the same root.
+ */
+function get_theme_roots() {
+	global $wp_theme_directories;
+
+	if ( ! is_array( $wp_theme_directories ) || count( $wp_theme_directories ) <= 1 ) {
+		return '/themes';
+	}
+
+	$theme_roots = get_site_transient( 'theme_roots' );
+	if ( false === $theme_roots ) {
+		search_theme_directories( true ); // Regenerate the transient.
+		$theme_roots = get_site_transient( 'theme_roots' );
+	}
+	return $theme_roots;
+}
+
+/**
+ * Registers a directory that contains themes.
+ *
+ * @since 2.9.0
+ *
+ * @global array $wp_theme_directories
+ *
+ * @param string $directory Either the full filesystem path to a theme folder
+ *                          or a folder within WP_CONTENT_DIR.
+ * @return bool True if successfully registered a directory that contains themes,
+ *              false if the directory does not exist.
+ */
+function register_theme_directory( $directory ) {
+	global $wp_theme_directories;
+
+	if ( ! file_exists( $directory ) ) {
+		// Try prepending as the theme directory could be relative to the content directory.
+		$directory = WP_CONTENT_DIR . '/' . $directory;
+		// If this directory does not exist, return and do not register.
+		if ( ! file_exists( $directory ) ) {
+			return false;
+		}
+	}
+
+	if ( ! is_array( $wp_theme_directories ) ) {
+		$wp_theme_directories = array();
+	}
+
+	$untrailed = untrailingslashit( $directory );
+	if ( ! empty( $untrailed ) && ! in_array( $untrailed, $wp_theme_directories, true ) ) {
+		$wp_theme_directories[] = $untrailed;
+	}
+
+	return true;
+}
+
+/**
+ * Searches all registered theme directories for complete and valid themes.
+ *
+ * @since 2.9.0
+ *
+ * @global array $wp_theme_directories
+ *
+ * @param bool $force Optional. Whether to force a new directory scan. Default false.
+ * @return array|false Valid themes found on success, false on failure.
+ */
+function search_theme_directories( $force = false ) {
+	global $wp_theme_directories;
+	static $found_themes = null;
+
+	if ( empty( $wp_theme_directories ) ) {
+		return false;
+	}
+
+	if ( ! $force && isset( $found_themes ) ) {
+		return $found_themes;
+	}
+
+	$found_themes = array();
+
+	$wp_theme_directories = (array) $wp_theme_directories;
+	$relative_theme_roots = array();
+
+	/*
+	 * Set up maybe-relative, maybe-absolute array of theme directories.
+	 * We always want to return absolute, but we need to cache relative
+	 * to use in get_theme_root().
+	 */
+	foreach ( $wp_theme_directories as $theme_root ) {
+		if ( str_starts_with( $theme_root, WP_CONTENT_DIR ) ) {
+			$relative_theme_roots[ str_replace( WP_CONTENT_DIR, '', $theme_root ) ] = $theme_root;
+		} else {
+			$relative_theme_roots[ $theme_root ] = $theme_root;
+		}
+	}
+
+	/**
+	 * Filters whether to get the cache of the registered theme directories.
+	 *
+	 * @since 3.4.0
+	 *
+	 * @param bool   $cache_expiration Whether to get the cache of the theme directories. Default false.
+	 * @param string $context          The class or function name calling the filter.
+	 */
+	$cache_expiration = apply_filters( 'wp_cache_themes_persistently', false, 'search_theme_directories' );
+
+	if ( $cache_expiration ) {
+		$cached_roots = get_site_transient( 'theme_roots' );
+		if ( is_array( $cached_roots ) ) {
+			foreach ( $cached_roots as $theme_dir => $theme_root ) {
+				// A cached theme root is no longer around, so skip it.
+				if ( ! isset( $relative_theme_roots[ $theme_root ] ) ) {
+					continue;
+				}
+				$found_themes[ $theme_dir ] = array(
+					'theme_file' => $theme_dir . '/style.css',
+					'theme_root' => $relative_theme_roots[ $theme_root ], // Convert relative to absolute.
+				);
+			}
+			return $found_themes;
+		}
+		if ( ! is_int( $cache_expiration ) ) {
+			$cache_expiration = 30 * MINUTE_IN_SECONDS;
+		}
+	} else {
+		$cache_expiration = 30 * MINUTE_IN_SECONDS;
+	}
+
+	/* Loop the registered theme directories and extract all themes */
+	foreach ( $wp_theme_directories as $theme_root ) {
+
+		// Start with directories in the root of the active theme directory.
+		$dirs = @ scandir( $theme_root );
+		if ( ! $dirs ) {
+			trigger_error( "$theme_root is not readable", E_USER_NOTICE );
+			continue;
+		}
+		foreach ( $dirs as $dir ) {
+			if ( ! is_dir( $theme_root . '/' . $dir ) || '.' === $dir[0] || 'CVS' === $dir ) {
+				continue;
+			}
+			if ( file_exists( $theme_root . '/' . $dir . '/style.css' ) ) {
+				/*
+				 * wp-content/themes/a-single-theme
+				 * wp-content/themes is $theme_root, a-single-theme is $dir.
+				 */
+				$found_themes[ $dir ] = array(
+					'theme_file' => $dir . '/style.css',
+					'theme_root' => $theme_root,
+				);
+			} else {
+				$found_theme = false;
+				/*
+				 * wp-content/themes/a-folder-of-themes/*
+				 * wp-content/themes is $theme_root, a-folder-of-themes is $dir, then themes are $sub_dirs.
+				 */
+				$sub_dirs = @ scandir( $theme_root . '/' . $dir );
+				if ( ! $sub_dirs ) {
+					trigger_error( "$theme_root/$dir is not readable", E_USER_NOTICE );
+					continue;
+				}
+				foreach ( $sub_dirs as $sub_dir ) {
+					if ( ! is_dir( $theme_root . '/' . $dir . '/' . $sub_dir ) || '.' === $dir[0] || 'CVS' === $dir ) {
+						continue;
+					}
+					if ( ! file_exists( $theme_root . '/' . $dir . '/' . $sub_dir . '/style.css' ) ) {
+						continue;
+					}
+					$found_themes[ $dir . '/' . $sub_dir ] = array(
+						'theme_file' => $dir . '/' . $sub_dir . '/style.css',
+						'theme_root' => $theme_root,
+					);
+					$found_theme                           = true;
+				}
+				/*
+				 * Never mind the above, it's just a theme missing a style.css.
+				 * Return it; WP_Theme will catch the error.
+				 */
+				if ( ! $found_theme ) {
+					$found_themes[ $dir ] = array(
+						'theme_file' => $dir . '/style.css',
+						'theme_root' => $theme_root,
+					);
+				}
+			}
+		}
+	}
+
+	asort( $found_themes );
+
+	$theme_roots          = array();
+	$relative_theme_roots = array_flip( $relative_theme_roots );
+
+	foreach ( $found_themes as $theme_dir => $theme_data ) {
+		$theme_roots[ $theme_dir ] = $relative_theme_roots[ $theme_data['theme_root'] ]; // Convert absolute to relative.
+	}
+
+	if ( get_site_transient( 'theme_roots' ) != $theme_roots ) {
+		set_site_transient( 'theme_roots', $theme_roots, $cache_expiration );
+	}
+
+	return $found_themes;
+}
+
+/**
+ * Retrieves path to themes directory.
+ *
+ * Does not have trailing slash.
+ *
+ * @since 1.5.0
+ *
+ * @global array $wp_theme_directories
+ *
+ * @param string $stylesheet_or_template Optional. The stylesheet or template name of the theme.
+ *                                       Default is to leverage the main theme root.
+ * @return string Themes directory path.
+ */
+function get_theme_root( $stylesheet_or_template = '' ) {
+	global $wp_theme_directories;
+
+	$theme_root = '';
+
+	if ( $stylesheet_or_template ) {
+		$theme_root = get_raw_theme_root( $stylesheet_or_template );
+		if ( $theme_root ) {
+			/*
+			 * Always prepend WP_CONTENT_DIR unless the root currently registered as a theme directory.
+			 * This gives relative theme roots the benefit of the doubt when things go haywire.
+			 */
+			if ( ! in_array( $theme_root, (array) $wp_theme_directories, true ) ) {
+				$theme_root = WP_CONTENT_DIR . $theme_root;
+			}
+		}
+	}
+
+	if ( ! $theme_root ) {
+		$theme_root = WP_CONTENT_DIR . '/themes';
+	}
+
+	/**
+	 * Filters the absolute path to the themes directory.
+	 *
+	 * @since 1.5.0
+	 *
+	 * @param string $theme_root Absolute path to themes directory.
+	 */
+	return apply_filters( 'theme_root', $theme_root );
+}
+
+/**
+ * Retrieves URI for themes directory.
+ *
+ * Does not have trailing slash.
+ *
+ * @since 1.5.0
+ *
+ * @global array $wp_theme_directories
+ *
+ * @param string $stylesheet_or_template Optional. The stylesheet or template name of the theme.
+ *                                       Default is to leverage the main theme root.
+ * @param string $theme_root             Optional. The theme root for which calculations will be based,
+ *                                       preventing the need for a get_raw_theme_root() call. Default empty.
+ * @return string Themes directory URI.
+ */
+function get_theme_root_uri( $stylesheet_or_template = '', $theme_root = '' ) {
+	global $wp_theme_directories;
+
+	if ( $stylesheet_or_template && ! $theme_root ) {
+		$theme_root = get_raw_theme_root( $stylesheet_or_template );
+	}
+
+	if ( $stylesheet_or_template && $theme_root ) {
+		if ( in_array( $theme_root, (array) $wp_theme_directories, true ) ) {
+			// Absolute path. Make an educated guess. YMMV -- but note the filter below.
+			if ( str_starts_with( $theme_root, WP_CONTENT_DIR ) ) {
+				$theme_root_uri = content_url( str_replace( WP_CONTENT_DIR, '', $theme_root ) );
+			} elseif ( str_starts_with( $theme_root, ABSPATH ) ) {
+				$theme_root_uri = site_url( str_replace( ABSPATH, '', $theme_root ) );
+			} elseif ( str_starts_with( $theme_root, WP_PLUGIN_DIR ) || str_starts_with( $theme_root, WPMU_PLUGIN_DIR ) ) {
+				$theme_root_uri = plugins_url( basename( $theme_root ), $theme_root );
+			} else {
+				$theme_root_uri = $theme_root;
+			}
+		} else {
+			$theme_root_uri = content_url( $theme_root );
+		}
+	} else {
+		$theme_root_uri = content_url( 'themes' );
+	}
+
+	/**
+	 * Filters the URI for themes directory.
+	 *
+	 * @since 1.5.0
+	 *
+	 * @param string $theme_root_uri         The URI for themes directory.
+	 * @param string $siteurl                WordPress web address which is set in General Options.
+	 * @param string $stylesheet_or_template The stylesheet or template name of the theme.
+	 */
+	return apply_filters( 'theme_root_uri', $theme_root_uri, get_option( 'siteurl' ), $stylesheet_or_template );
+}
+
+/**
+ * Gets the raw theme root relative to the content directory with no filters applied.
+ *
+ * @since 3.1.0
+ *
+ * @global array $wp_theme_directories
+ *
+ * @param string $stylesheet_or_template The stylesheet or template name of the theme.
+ * @param bool   $skip_cache             Optional. Whether to skip the cache.
+ *                                       Defaults to false, meaning the cache is used.
+ * @return string Theme root.
+ */
+function get_raw_theme_root( $stylesheet_or_template, $skip_cache = false ) {
+	global $wp_theme_directories;
+
+	if ( ! is_array( $wp_theme_directories ) || count( $wp_theme_directories ) <= 1 ) {
+		return '/themes';
+	}
+
+	$theme_root = false;
+
+	// If requesting the root for the active theme, consult options to avoid calling get_theme_roots().
+	if ( ! $skip_cache ) {
+		if ( get_option( 'stylesheet' ) == $stylesheet_or_template ) {
+			$theme_root = get_option( 'stylesheet_root' );
+		} elseif ( get_option( 'template' ) == $stylesheet_or_template ) {
+			$theme_root = get_option( 'template_root' );
+		}
+	}
+
+	if ( empty( $theme_root ) ) {
+		$theme_roots = get_theme_roots();
+		if ( ! empty( $theme_roots[ $stylesheet_or_template ] ) ) {
+			$theme_root = $theme_roots[ $stylesheet_or_template ];
+		}
+	}
+
+	return $theme_root;
+}
+
+/**
+ * Displays localized stylesheet link element.
+ *
+ * @since 2.1.0
+ */
+function locale_stylesheet() {
+	$stylesheet = get_locale_stylesheet_uri();
+	if ( empty( $stylesheet ) ) {
+		return;
+	}
+
+	$type_attr = current_theme_supports( 'html5', 'style' ) ? '' : ' type="text/css"';
+
+	printf(
+		'<link rel="stylesheet" href="%s"%s media="screen" />',
+		$stylesheet,
+		$type_attr
+	);
+}
+
+/**
+ * Switches the theme.
+ *
+ * Accepts one argument: $stylesheet of the theme. It also accepts an additional function signature
+ * of two arguments: $template then $stylesheet. This is for backward compatibility.
+ *
+ * @since 2.5.0
+ *
+ * @global array                $wp_theme_directories
+ * @global WP_Customize_Manager $wp_customize
+ * @global array                $sidebars_widgets
+ * @global array                $wp_registered_sidebars
+ *
+ * @param string $stylesheet Stylesheet name.
+ */
+function switch_theme( $stylesheet ) {
+	global $wp_theme_directories, $wp_customize, $sidebars_widgets, $wp_registered_sidebars;
+
+	$requirements = validate_theme_requirements( $stylesheet );
+	if ( is_wp_error( $requirements ) ) {
+		wp_die( $requirements );
+	}
+
+	$_sidebars_widgets = null;
+	if ( 'wp_ajax_customize_save' === current_action() ) {
+		$old_sidebars_widgets_data_setting = $wp_customize->get_setting( 'old_sidebars_widgets_data' );
+		if ( $old_sidebars_widgets_data_setting ) {
+			$_sidebars_widgets = $wp_customize->post_value( $old_sidebars_widgets_data_setting );
+		}
+	} elseif ( is_array( $sidebars_widgets ) ) {
+		$_sidebars_widgets = $sidebars_widgets;
+	}
+
+	if ( is_array( $_sidebars_widgets ) ) {
+		set_theme_mod(
+			'sidebars_widgets',
+			array(
+				'time' => time(),
+				'data' => $_sidebars_widgets,
+			)
+		);
+	}
+
+	$nav_menu_locations = get_theme_mod( 'nav_menu_locations' );
+	update_option( 'theme_switch_menu_locations', $nav_menu_locations );
+
+	if ( func_num_args() > 1 ) {
+		$stylesheet = func_get_arg( 1 );
+	}
+
+	$old_theme = wp_get_theme();
+	$new_theme = wp_get_theme( $stylesheet );
+	$template  = $new_theme->get_template();
+
+	if ( wp_is_recovery_mode() ) {
+		$paused_themes = wp_paused_themes();
+		$paused_themes->delete( $old_theme->get_stylesheet() );
+		$paused_themes->delete( $old_theme->get_template() );
+	}
+
+	update_option( 'template', $template );
+	update_option( 'stylesheet', $stylesheet );
+
+	if ( count( $wp_theme_directories ) > 1 ) {
+		update_option( 'template_root', get_raw_theme_root( $template, true ) );
+		update_option( 'stylesheet_root', get_raw_theme_root( $stylesheet, true ) );
+	} else {
+		delete_option( 'template_root' );
+		delete_option( 'stylesheet_root' );
+	}
+
+	$new_name = $new_theme->get( 'Name' );
+
+	update_option( 'current_theme', $new_name );
+
+	// Migrate from the old mods_{name} option to theme_mods_{slug}.
+	if ( is_admin() && false === get_option( 'theme_mods_' . $stylesheet ) ) {
+		$default_theme_mods = (array) get_option( 'mods_' . $new_name );
+		if ( ! empty( $nav_menu_locations ) && empty( $default_theme_mods['nav_menu_locations'] ) ) {
+			$default_theme_mods['nav_menu_locations'] = $nav_menu_locations;
+		}
+		add_option( "theme_mods_$stylesheet", $default_theme_mods );
+	} else {
+		/*
+		 * Since retrieve_widgets() is called when initializing a theme in the Customizer,
+		 * we need to remove the theme mods to avoid overwriting changes made via
+		 * the Customizer when accessing wp-admin/widgets.php.
+		 */
+		if ( 'wp_ajax_customize_save' === current_action() ) {
+			remove_theme_mod( 'sidebars_widgets' );
+		}
+	}
+
+	// Stores classic sidebars for later use by block themes.
+	if ( $new_theme->is_block_theme() ) {
+		set_theme_mod( 'wp_classic_sidebars', $wp_registered_sidebars );
+	}
+
+	update_option( 'theme_switched', $old_theme->get_stylesheet() );
+
+	// Clear pattern caches.
+	$new_theme->delete_pattern_cache();
+	$old_theme->delete_pattern_cache();
+
+	/**
+	 * Fires after the theme is switched.
+	 *
+	 * See {@see 'after_switch_theme'}.
+	 *
+	 * @since 1.5.0
+	 * @since 4.5.0 Introduced the `$old_theme` parameter.
+	 *
+	 * @param string   $new_name  Name of the new theme.
+	 * @param WP_Theme $new_theme WP_Theme instance of the new theme.
+	 * @param WP_Theme $old_theme WP_Theme instance of the old theme.
+	 */
+	do_action( 'switch_theme', $new_name, $new_theme, $old_theme );
+}
+
+/**
+ * Checks that the active theme has the required files.
+ *
+ * Standalone themes need to have a `templates/index.html` or `index.php` template file.
+ * Child themes need to have a `Template` header in the `style.css` stylesheet.
+ *
+ * Does not initially check the default theme, which is the fallback and should always exist.
+ * But if it doesn't exist, it'll fall back to the latest core default theme that does exist.
+ * Will switch theme to the fallback theme if active theme does not validate.
+ *
+ * You can use the {@see 'validate_current_theme'} filter to return false to disable
+ * this functionality.
+ *
+ * @since 1.5.0
+ * @since 6.0.0 Removed the requirement for block themes to have an `index.php` template.
+ *
+ * @see WP_DEFAULT_THEME
+ *
+ * @return bool
+ */
+function validate_current_theme() {
+	/**
+	 * Filters whether to validate the active theme.
+	 *
+	 * @since 2.7.0
+	 *
+	 * @param bool $validate Whether to validate the active theme. Default true.
+	 */
+	if ( wp_installing() || ! apply_filters( 'validate_current_theme', true ) ) {
+		return true;
+	}
+
+	if (
+		! file_exists( get_template_directory() . '/templates/index.html' )
+		&& ! file_exists( get_template_directory() . '/block-templates/index.html' ) // Deprecated path support since 5.9.0.
+		&& ! file_exists( get_template_directory() . '/index.php' )
+	) {
+		// Invalid.
+	} elseif ( ! file_exists( get_template_directory() . '/style.css' ) ) {
+		// Invalid.
+	} elseif ( is_child_theme() && ! file_exists( get_stylesheet_directory() . '/style.css' ) ) {
+		// Invalid.
+	} else {
+		// Valid.
+		return true;
+	}
+
+	$default = wp_get_theme( WP_DEFAULT_THEME );
+	if ( $default->exists() ) {
+		switch_theme( WP_DEFAULT_THEME );
+		return false;
+	}
+
+	/**
+	 * If we're in an invalid state but WP_DEFAULT_THEME doesn't exist,
+	 * switch to the latest core default theme that's installed.
+	 *
+	 * If it turns out that this latest core default theme is our current
+	 * theme, then there's nothing we can do about that, so we have to bail,
+	 * rather than going into an infinite loop. (This is why there are
+	 * checks against WP_DEFAULT_THEME above, also.) We also can't do anything
+	 * if it turns out there is no default theme installed. (That's `false`.)
+	 */
+	$default = WP_Theme::get_core_default_theme();
+	if ( false === $default || get_stylesheet() == $default->get_stylesheet() ) {
+		return true;
+	}
+
+	switch_theme( $default->get_stylesheet() );
+	return false;
+}
+
+/**
+ * Validates the theme requirements for WordPress version and PHP version.
+ *
+ * Uses the information from `Requires at least` and `Requires PHP` headers
+ * defined in the theme's `style.css` file.
+ *
+ * @since 5.5.0
+ * @since 5.8.0 Removed support for using `readme.txt` as a fallback.
+ *
+ * @param string $stylesheet Directory name for the theme.
+ * @return true|WP_Error True if requirements are met, WP_Error on failure.
+ */
+function validate_theme_requirements( $stylesheet ) {
+	$theme = wp_get_theme( $stylesheet );
+
+	$requirements = array(
+		'requires'     => ! empty( $theme->get( 'RequiresWP' ) ) ? $theme->get( 'RequiresWP' ) : '',
+		'requires_php' => ! empty( $theme->get( 'RequiresPHP' ) ) ? $theme->get( 'RequiresPHP' ) : '',
+	);
+
+	$compatible_wp  = is_wp_version_compatible( $requirements['requires'] );
+	$compatible_php = is_php_version_compatible( $requirements['requires_php'] );
+
+	if ( ! $compatible_wp && ! $compatible_php ) {
+		return new WP_Error(
+			'theme_wp_php_incompatible',
+			sprintf(
+				/* translators: %s: Theme name. */
+				_x( '<strong>Error:</strong> Current WordPress and PHP versions do not meet minimum requirements for %s.', 'theme' ),
+				$theme->display( 'Name' )
+			)
+		);
+	} elseif ( ! $compatible_php ) {
+		return new WP_Error(
+			'theme_php_incompatible',
+			sprintf(
+				/* translators: %s: Theme name. */
+				_x( '<strong>Error:</strong> Current PHP version does not meet minimum requirements for %s.', 'theme' ),
+				$theme->display( 'Name' )
+			)
+		);
+	} elseif ( ! $compatible_wp ) {
+		return new WP_Error(
+			'theme_wp_incompatible',
+			sprintf(
+				/* translators: %s: Theme name. */
+				_x( '<strong>Error:</strong> Current WordPress version does not meet minimum requirements for %s.', 'theme' ),
+				$theme->display( 'Name' )
+			)
+		);
+	}
+
+	return true;
+}
+
+/**
+ * Retrieves all theme modifications.
+ *
+ * @since 3.1.0
+ * @since 5.9.0 The return value is always an array.
+ *
+ * @return array Theme modifications.
+ */
+function get_theme_mods() {
+	$theme_slug = get_option( 'stylesheet' );
+	$mods       = get_option( "theme_mods_$theme_slug" );
+
+	if ( false === $mods ) {
+		$theme_name = get_option( 'current_theme' );
+		if ( false === $theme_name ) {
+			$theme_name = wp_get_theme()->get( 'Name' );
+		}
+
+		$mods = get_option( "mods_$theme_name" ); // Deprecated location.
+		if ( is_admin() && false !== $mods ) {
+			update_option( "theme_mods_$theme_slug", $mods );
+			delete_option( "mods_$theme_name" );
+		}
+	}
+
+	if ( ! is_array( $mods ) ) {
+		$mods = array();
+	}
+
+	return $mods;
+}
+
+/**
+ * Retrieves theme modification value for the active theme.
+ *
+ * If the modification name does not exist and `$default_value` is a string, then the
+ * default will be passed through the {@link https://www.php.net/sprintf sprintf()}
+ * PHP function with the template directory URI as the first value and the
+ * stylesheet directory URI as the second value.
+ *
+ * @since 2.1.0
+ *
+ * @param string $name          Theme modification name.
+ * @param mixed  $default_value Optional. Theme modification default value. Default false.
+ * @return mixed Theme modification value.
+ */
+function get_theme_mod( $name, $default_value = false ) {
+	$mods = get_theme_mods();
+
+	if ( isset( $mods[ $name ] ) ) {
+		/**
+		 * Filters the theme modification, or 'theme_mod', value.
+		 *
+		 * The dynamic portion of the hook name, `$name`, refers to the key name
+		 * of the modification array. For example, 'header_textcolor', 'header_image',
+		 * and so on depending on the theme options.
+		 *
+		 * @since 2.2.0
+		 *
+		 * @param mixed $current_mod The value of the active theme modification.
+		 */
+		return apply_filters( "theme_mod_{$name}", $mods[ $name ] );
+	}
+
+	if ( is_string( $default_value ) ) {
+		// Only run the replacement if an sprintf() string format pattern was found.
+		if ( preg_match( '#(?<!%)%(?:\d+\$?)?s#', $default_value ) ) {
+			// Remove a single trailing percent sign.
+			$default_value = preg_replace( '#(?<!%)%$#', '', $default_value );
+			$default_value = sprintf( $default_value, get_template_directory_uri(), get_stylesheet_directory_uri() );
+		}
+	}
+
+	/** This filter is documented in wp-includes/theme.php */
+	return apply_filters( "theme_mod_{$name}", $default_value );
+}
+
+/**
+ * Updates theme modification value for the active theme.
+ *
+ * @since 2.1.0
+ * @since 5.6.0 A return value was added.
+ *
+ * @param string $name  Theme modification name.
+ * @param mixed  $value Theme modification value.
+ * @return bool True if the value was updated, false otherwise.
+ */
+function set_theme_mod( $name, $value ) {
+	$mods      = get_theme_mods();
+	$old_value = isset( $mods[ $name ] ) ? $mods[ $name ] : false;
+
+	/**
+	 * Filters the theme modification, or 'theme_mod', value on save.
+	 *
+	 * The dynamic portion of the hook name, `$name`, refers to the key name
+	 * of the modification array. For example, 'header_textcolor', 'header_image',
+	 * and so on depending on the theme options.
+	 *
+	 * @since 3.9.0
+	 *
+	 * @param mixed $value     The new value of the theme modification.
+	 * @param mixed $old_value The current value of the theme modification.
+	 */
+	$mods[ $name ] = apply_filters( "pre_set_theme_mod_{$name}", $value, $old_value );
+
+	$theme = get_option( 'stylesheet' );
+
+	return update_option( "theme_mods_$theme", $mods );
+}
+
+/**
+ * Removes theme modification name from active theme list.
+ *
+ * If removing the name also removes all elements, then the entire option
+ * will be removed.
+ *
+ * @since 2.1.0
+ *
+ * @param string $name Theme modification name.
+ */
+function remove_theme_mod( $name ) {
+	$mods = get_theme_mods();
+
+	if ( ! isset( $mods[ $name ] ) ) {
+		return;
+	}
+
+	unset( $mods[ $name ] );
+
+	if ( empty( $mods ) ) {
+		remove_theme_mods();
+		return;
+	}
+
+	$theme = get_option( 'stylesheet' );
+
+	update_option( "theme_mods_$theme", $mods );
+}
+
+/**
+ * Removes theme modifications option for the active theme.
+ *
+ * @since 2.1.0
+ */
+function remove_theme_mods() {
+	delete_option( 'theme_mods_' . get_option( 'stylesheet' ) );
+
+	// Old style.
+	$theme_name = get_option( 'current_theme' );
+	if ( false === $theme_name ) {
+		$theme_name = wp_get_theme()->get( 'Name' );
+	}
+
+	delete_option( 'mods_' . $theme_name );
+}
+
+/**
+ * Retrieves the custom header text color in 3- or 6-digit hexadecimal form.
+ *
+ * @since 2.1.0
+ *
+ * @return string Header text color in 3- or 6-digit hexadecimal form (minus the hash symbol).
+ */
+function get_header_textcolor() {
+	return get_theme_mod( 'header_textcolor', get_theme_support( 'custom-header', 'default-text-color' ) );
+}
+
+/**
+ * Displays the custom header text color in 3- or 6-digit hexadecimal form (minus the hash symbol).
+ *
+ * @since 2.1.0
+ */
+function header_textcolor() {
+	echo get_header_textcolor();
+}
+
+/**
+ * Whether to display the header text.
+ *
+ * @since 3.4.0
+ *
+ * @return bool
+ */
+function display_header_text() {
+	if ( ! current_theme_supports( 'custom-header', 'header-text' ) ) {
+		return false;
+	}
+
+	$text_color = get_theme_mod( 'header_textcolor', get_theme_support( 'custom-header', 'default-text-color' ) );
+	return 'blank' !== $text_color;
+}
+
+/**
+ * Checks whether a header image is set or not.
+ *
+ * @since 4.2.0
+ *
+ * @see get_header_image()
+ *
+ * @return bool Whether a header image is set or not.
+ */
+function has_header_image() {
+	return (bool) get_header_image();
+}
+
+/**
+ * Retrieves header image for custom header.
+ *
+ * @since 2.1.0
+ *
+ * @return string|false
+ */
+function get_header_image() {
+	$url = get_theme_mod( 'header_image', get_theme_support( 'custom-header', 'default-image' ) );
+
+	if ( 'remove-header' === $url ) {
+		return false;
+	}
+
+	if ( is_random_header_image() ) {
+		$url = get_random_header_image();
+	}
+
+	/**
+	 * Filters the header image URL.
+	 *
+	 * @since 6.1.0
+	 *
+	 * @param string $url Header image URL.
+	 */
+	$url = apply_filters( 'get_header_image', $url );
+
+	if ( ! is_string( $url ) ) {
+		return false;
+	}
+
+	$url = trim( $url );
+	return sanitize_url( set_url_scheme( $url ) );
+}
+
+/**
+ * Creates image tag markup for a custom header image.
+ *
+ * @since 4.4.0
+ *
+ * @param array $attr Optional. Additional attributes for the image tag. Can be used
+ *                              to override the default attributes. Default empty.
+ * @return string HTML image element markup or empty string on failure.
+ */
+function get_header_image_tag( $attr = array() ) {
+	$header      = get_custom_header();
+	$header->url = get_header_image();
+
+	if ( ! $header->url ) {
+		return '';
+	}
+
+	$width  = absint( $header->width );
+	$height = absint( $header->height );
+	$alt    = '';
+
+	// Use alternative text assigned to the image, if available. Otherwise, leave it empty.
+	if ( ! empty( $header->attachment_id ) ) {
+		$image_alt = get_post_meta( $header->attachment_id, '_wp_attachment_image_alt', true );
+
+		if ( is_string( $image_alt ) ) {
+			$alt = $image_alt;
+		}
+	}
+
+	$attr = wp_parse_args(
+		$attr,
+		array(
+			'src'    => $header->url,
+			'width'  => $width,
+			'height' => $height,
+			'alt'    => $alt,
+		)
+	);
+
+	// Generate 'srcset' and 'sizes' if not already present.
+	if ( empty( $attr['srcset'] ) && ! empty( $header->attachment_id ) ) {
+		$image_meta = get_post_meta( $header->attachment_id, '_wp_attachment_metadata', true );
+		$size_array = array( $width, $height );
+
+		if ( is_array( $image_meta ) ) {
+			$srcset = wp_calculate_image_srcset( $size_array, $header->url, $image_meta, $header->attachment_id );
+
+			if ( ! empty( $attr['sizes'] ) ) {
+				$sizes = $attr['sizes'];
+			} else {
+				$sizes = wp_calculate_image_sizes( $size_array, $header->url, $image_meta, $header->attachment_id );
+			}
+
+			if ( $srcset && $sizes ) {
+				$attr['srcset'] = $srcset;
+				$attr['sizes']  = $sizes;
+			}
+		}
+	}
+
+	$attr = array_merge(
+		$attr,
+		wp_get_loading_optimization_attributes( 'img', $attr, 'get_header_image_tag' )
+	);
+
+	/*
+	 * If the default value of `lazy` for the `loading` attribute is overridden
+	 * to omit the attribute for this image, ensure it is not included.
+	 */
+	if ( isset( $attr['loading'] ) && ! $attr['loading'] ) {
+		unset( $attr['loading'] );
+	}
+
+	// If the `fetchpriority` attribute is overridden and set to false or an empty string.
+	if ( isset( $attr['fetchpriority'] ) && ! $attr['fetchpriority'] ) {
+		unset( $attr['fetchpriority'] );
+	}
+
+	// If the `decoding` attribute is overridden and set to false or an empty string.
+	if ( isset( $attr['decoding'] ) && ! $attr['decoding'] ) {
+		unset( $attr['decoding'] );
+	}
+
+	/**
+	 * Filters the list of header image attributes.
+	 *
+	 * @since 5.9.0
+	 *
+	 * @param array  $attr   Array of the attributes for the image tag.
+	 * @param object $header The custom header object returned by 'get_custom_header()'.
+	 */
+	$attr = apply_filters( 'get_header_image_tag_attributes', $attr, $header );
+
+	$attr = array_map( 'esc_attr', $attr );
+	$html = '<img';
+
+	foreach ( $attr as $name => $value ) {
+		$html .= ' ' . $name . '="' . $value . '"';
+	}
+
+	$html .= ' />';
+
+	/**
+	 * Filters the markup of header images.
+	 *
+	 * @since 4.4.0
+	 *
+	 * @param string $html   The HTML image tag markup being filtered.
+	 * @param object $header The custom header object returned by 'get_custom_header()'.
+	 * @param array  $attr   Array of the attributes for the image tag.
+	 */
+	return apply_filters( 'get_header_image_tag', $html, $header, $attr );
+}
+
+/**
+ * Displays the image markup for a custom header image.
+ *
+ * @since 4.4.0
+ *
+ * @param array $attr Optional. Attributes for the image markup. Default empty.
+ */
+function the_header_image_tag( $attr = array() ) {
+	echo get_header_image_tag( $attr );
+}
+
+/**
+ * Gets random header image data from registered images in theme.
+ *
+ * @since 3.4.0
+ *
+ * @access private
+ *
+ * @global array $_wp_default_headers
+ *
+ * @return object
+ */
+function _get_random_header_data() {
+	global $_wp_default_headers;
+	static $_wp_random_header = null;
+
+	if ( empty( $_wp_random_header ) ) {
+		$header_image_mod = get_theme_mod( 'header_image', '' );
+		$headers          = array();
+
+		if ( 'random-uploaded-image' === $header_image_mod ) {
+			$headers = get_uploaded_header_images();
+		} elseif ( ! empty( $_wp_default_headers ) ) {
+			if ( 'random-default-image' === $header_image_mod ) {
+				$headers = $_wp_default_headers;
+			} else {
+				if ( current_theme_supports( 'custom-header', 'random-default' ) ) {
+					$headers = $_wp_default_headers;
+				}
+			}
+		}
+
+		if ( empty( $headers ) ) {
+			return new stdClass();
+		}
+
+		$_wp_random_header = (object) $headers[ array_rand( $headers ) ];
+
+		$_wp_random_header->url = sprintf(
+			$_wp_random_header->url,
+			get_template_directory_uri(),
+			get_stylesheet_directory_uri()
+		);
+
+		$_wp_random_header->thumbnail_url = sprintf(
+			$_wp_random_header->thumbnail_url,
+			get_template_directory_uri(),
+			get_stylesheet_directory_uri()
+		);
+	}
+
+	return $_wp_random_header;
+}
+
+/**
+ * Gets random header image URL from registered images in theme.
+ *
+ * @since 3.2.0
+ *
+ * @return string Path to header image.
+ */
+function get_random_header_image() {
+	$random_image = _get_random_header_data();
+
+	if ( empty( $random_image->url ) ) {
+		return '';
+	}
+
+	return $random_image->url;
+}
+
+/**
+ * Checks if random header image is in use.
+ *
+ * Always true if user expressly chooses the option in Appearance > Header.
+ * Also true if theme has multiple header images registered, no specific header image
+ * is chosen, and theme turns on random headers with add_theme_support().
+ *
+ * @since 3.2.0
+ *
+ * @param string $type The random pool to use. Possible values include 'any',
+ *                     'default', 'uploaded'. Default 'any'.
+ * @return bool
+ */
+function is_random_header_image( $type = 'any' ) {
+	$header_image_mod = get_theme_mod( 'header_image', get_theme_support( 'custom-header', 'default-image' ) );
+
+	if ( 'any' === $type ) {
+		if ( 'random-default-image' === $header_image_mod
+			|| 'random-uploaded-image' === $header_image_mod
+			|| ( '' !== get_random_header_image() && empty( $header_image_mod ) )
+		) {
+			return true;
+		}
+	} else {
+		if ( "random-$type-image" === $header_image_mod ) {
+			return true;
+		} elseif ( 'default' === $type && empty( $header_image_mod ) && '' !== get_random_header_image() ) {
+			return true;
+		}
+	}
+
+	return false;
+}
+
+/**
+ * Displays header image URL.
+ *
+ * @since 2.1.0
+ */
+function header_image() {
+	$image = get_header_image();
+
+	if ( $image ) {
+		echo esc_url( $image );
+	}
+}
+
+/**
+ * Gets the header images uploaded for the active theme.
+ *
+ * @since 3.2.0
+ *
+ * @return array
+ */
+function get_uploaded_header_images() {
+	$header_images = array();
+
+	// @todo Caching.
+	$headers = get_posts(
+		array(
+			'post_type'  => 'attachment',
+			'meta_key'   => '_wp_attachment_is_custom_header',
+			'meta_value' => get_option( 'stylesheet' ),
+			'orderby'    => 'none',
+			'nopaging'   => true,
+		)
+	);
+
+	if ( empty( $headers ) ) {
+		return array();
+	}
+
+	foreach ( (array) $headers as $header ) {
+		$url          = sanitize_url( wp_get_attachment_url( $header->ID ) );
+		$header_data  = wp_get_attachment_metadata( $header->ID );
+		$header_index = $header->ID;
+
+		$header_images[ $header_index ]                  = array();
+		$header_images[ $header_index ]['attachment_id'] = $header->ID;
+		$header_images[ $header_index ]['url']           = $url;
+		$header_images[ $header_index ]['thumbnail_url'] = $url;
+		$header_images[ $header_index ]['alt_text']      = get_post_meta( $header->ID, '_wp_attachment_image_alt', true );
+
+		if ( isset( $header_data['attachment_parent'] ) ) {
+			$header_images[ $header_index ]['attachment_parent'] = $header_data['attachment_parent'];
+		} else {
+			$header_images[ $header_index ]['attachment_parent'] = '';
+		}
+
+		if ( isset( $header_data['width'] ) ) {
+			$header_images[ $header_index ]['width'] = $header_data['width'];
+		}
+		if ( isset( $header_data['height'] ) ) {
+			$header_images[ $header_index ]['height'] = $header_data['height'];
+		}
+	}
+
+	return $header_images;
+}
+
+/**
+ * Gets the header image data.
+ *
+ * @since 3.4.0
+ *
+ * @global array $_wp_default_headers
+ *
+ * @return object
+ */
+function get_custom_header() {
+	global $_wp_default_headers;
+
+	if ( is_random_header_image() ) {
+		$data = _get_random_header_data();
+	} else {
+		$data = get_theme_mod( 'header_image_data' );
+		if ( ! $data && current_theme_supports( 'custom-header', 'default-image' ) ) {
+			$directory_args        = array( get_template_directory_uri(), get_stylesheet_directory_uri() );
+			$data                  = array();
+			$data['url']           = vsprintf( get_theme_support( 'custom-header', 'default-image' ), $directory_args );
+			$data['thumbnail_url'] = $data['url'];
+			if ( ! empty( $_wp_default_headers ) ) {
+				foreach ( (array) $_wp_default_headers as $default_header ) {
+					$url = vsprintf( $default_header['url'], $directory_args );
+					if ( $data['url'] == $url ) {
+						$data                  = $default_header;
+						$data['url']           = $url;
+						$data['thumbnail_url'] = vsprintf( $data['thumbnail_url'], $directory_args );
+						break;
+					}
+				}
+			}
+		}
+	}
+
+	$default = array(
+		'url'           => '',
+		'thumbnail_url' => '',
+		'width'         => get_theme_support( 'custom-header', 'width' ),
+		'height'        => get_theme_support( 'custom-header', 'height' ),
+		'video'         => get_theme_support( 'custom-header', 'video' ),
+	);
+	return (object) wp_parse_args( $data, $default );
+}
+
+/**
+ * Registers a selection of default headers to be displayed by the custom header admin UI.
+ *
+ * @since 3.0.0
+ *
+ * @global array $_wp_default_headers
+ *
+ * @param array $headers Array of headers keyed by a string ID. The IDs point to arrays
+ *                       containing 'url', 'thumbnail_url', and 'description' keys.
+ */
+function register_default_headers( $headers ) {
+	global $_wp_default_headers;
+
+	$_wp_default_headers = array_merge( (array) $_wp_default_headers, (array) $headers );
+}
+
+/**
+ * Unregisters default headers.
+ *
+ * This function must be called after register_default_headers() has already added the
+ * header you want to remove.
+ *
+ * @see register_default_headers()
+ * @since 3.0.0
+ *
+ * @global array $_wp_default_headers
+ *
+ * @param string|array $header The header string id (key of array) to remove, or an array thereof.
+ * @return bool|void A single header returns true on success, false on failure.
+ *                   There is currently no return value for multiple headers.
+ */
+function unregister_default_headers( $header ) {
+	global $_wp_default_headers;
+
+	if ( is_array( $header ) ) {
+		array_map( 'unregister_default_headers', $header );
+	} elseif ( isset( $_wp_default_headers[ $header ] ) ) {
+		unset( $_wp_default_headers[ $header ] );
+		return true;
+	} else {
+		return false;
+	}
+}
+
+/**
+ * Checks whether a header video is set or not.
+ *
+ * @since 4.7.0
+ *
+ * @see get_header_video_url()
+ *
+ * @return bool Whether a header video is set or not.
+ */
+function has_header_video() {
+	return (bool) get_header_video_url();
+}
+
+/**
+ * Retrieves header video URL for custom header.
+ *
+ * Uses a local video if present, or falls back to an external video.
+ *
+ * @since 4.7.0
+ *
+ * @return string|false Header video URL or false if there is no video.
+ */
+function get_header_video_url() {
+	$id = absint( get_theme_mod( 'header_video' ) );
+
+	if ( $id ) {
+		// Get the file URL from the attachment ID.
+		$url = wp_get_attachment_url( $id );
+	} else {
+		$url = get_theme_mod( 'external_header_video' );
+	}
+
+	/**
+	 * Filters the header video URL.
+	 *
+	 * @since 4.7.3
+	 *
+	 * @param string $url Header video URL, if available.
+	 */
+	$url = apply_filters( 'get_header_video_url', $url );
+
+	if ( ! $id && ! $url ) {
+		return false;
+	}
+
+	return sanitize_url( set_url_scheme( $url ) );
+}
+
+/**
+ * Displays header video URL.
+ *
+ * @since 4.7.0
+ */
+function the_header_video_url() {
+	$video = get_header_video_url();
+
+	if ( $video ) {
+		echo esc_url( $video );
+	}
+}
+
+/**
+ * Retrieves header video settings.
+ *
+ * @since 4.7.0
+ *
+ * @return array
+ */
+function get_header_video_settings() {
+	$header     = get_custom_header();
+	$video_url  = get_header_video_url();
+	$video_type = wp_check_filetype( $video_url, wp_get_mime_types() );
+
+	$settings = array(
+		'mimeType'  => '',
+		'posterUrl' => get_header_image(),
+		'videoUrl'  => $video_url,
+		'width'     => absint( $header->width ),
+		'height'    => absint( $header->height ),
+		'minWidth'  => 900,
+		'minHeight' => 500,
+		'l10n'      => array(
+			'pause'      => __( 'Pause' ),
+			'play'       => __( 'Play' ),
+			'pauseSpeak' => __( 'Video is paused.' ),
+			'playSpeak'  => __( 'Video is playing.' ),
+		),
+	);
+
+	if ( preg_match( '#^https?://(?:www\.)?(?:youtube\.com/watch|youtu\.be/)#', $video_url ) ) {
+		$settings['mimeType'] = 'video/x-youtube';
+	} elseif ( ! empty( $video_type['type'] ) ) {
+		$settings['mimeType'] = $video_type['type'];
+	}
+
+	/**
+	 * Filters header video settings.
+	 *
+	 * @since 4.7.0
+	 *
+	 * @param array $settings An array of header video settings.
+	 */
+	return apply_filters( 'header_video_settings', $settings );
+}
+
+/**
+ * Checks whether a custom header is set or not.
+ *
+ * @since 4.7.0
+ *
+ * @return bool True if a custom header is set. False if not.
+ */
+function has_custom_header() {
+	if ( has_header_image() || ( has_header_video() && is_header_video_active() ) ) {
+		return true;
+	}
+
+	return false;
+}
+
+/**
+ * Checks whether the custom header video is eligible to show on the current page.
+ *
+ * @since 4.7.0
+ *
+ * @return bool True if the custom header video should be shown. False if not.
+ */
+function is_header_video_active() {
+	if ( ! get_theme_support( 'custom-header', 'video' ) ) {
+		return false;
+	}
+
+	$video_active_cb = get_theme_support( 'custom-header', 'video-active-callback' );
+
+	if ( empty( $video_active_cb ) || ! is_callable( $video_active_cb ) ) {
+		$show_video = true;
+	} else {
+		$show_video = call_user_func( $video_active_cb );
+	}
+
+	/**
+	 * Filters whether the custom header video is eligible to show on the current page.
+	 *
+	 * @since 4.7.0
+	 *
+	 * @param bool $show_video Whether the custom header video should be shown. Returns the value
+	 *                         of the theme setting for the `custom-header`'s `video-active-callback`.
+	 *                         If no callback is set, the default value is that of `is_front_page()`.
+	 */
+	return apply_filters( 'is_header_video_active', $show_video );
+}
+
+/**
+ * Retrieves the markup for a custom header.
+ *
+ * The container div will always be returned in the Customizer preview.
+ *
+ * @since 4.7.0
+ *
+ * @return string The markup for a custom header on success.
+ */
+function get_custom_header_markup() {
+	if ( ! has_custom_header() && ! is_customize_preview() ) {
+		return '';
+	}
+
+	return sprintf(
+		'<div id="wp-custom-header" class="wp-custom-header">%s</div>',
+		get_header_image_tag()
+	);
+}
+
+/**
+ * Prints the markup for a custom header.
+ *
+ * A container div will always be printed in the Customizer preview.
+ *
+ * @since 4.7.0
+ */
+function the_custom_header_markup() {
+	$custom_header = get_custom_header_markup();
+	if ( empty( $custom_header ) ) {
+		return;
+	}
+
+	echo $custom_header;
+
+	if ( is_header_video_active() && ( has_header_video() || is_customize_preview() ) ) {
+		wp_enqueue_script( 'wp-custom-header' );
+		wp_localize_script( 'wp-custom-header', '_wpCustomHeaderSettings', get_header_video_settings() );
+	}
+}
+
+/**
+ * Retrieves background image for custom background.
+ *
+ * @since 3.0.0
+ *
+ * @return string
+ */
+function get_background_image() {
+	return get_theme_mod( 'background_image', get_theme_support( 'custom-background', 'default-image' ) );
+}
+
+/**
+ * Displays background image path.
+ *
+ * @since 3.0.0
+ */
+function background_image() {
+	echo get_background_image();
+}
+
+/**
+ * Retrieves value for custom background color.
+ *
+ * @since 3.0.0
+ *
+ * @return string
+ */
+function get_background_color() {
+	return get_theme_mod( 'background_color', get_theme_support( 'custom-background', 'default-color' ) );
+}
+
+/**
+ * Displays background color value.
+ *
+ * @since 3.0.0
+ */
+function background_color() {
+	echo get_background_color();
+}
+
+/**
+ * Default custom background callback.
+ *
+ * @since 3.0.0
+ */
+function _custom_background_cb() {
+	// $background is the saved custom image, or the default image.
+	$background = set_url_scheme( get_background_image() );
+
+	/*
+	 * $color is the saved custom color.
+	 * A default has to be specified in style.css. It will not be printed here.
+	 */
+	$color = get_background_color();
+
+	if ( get_theme_support( 'custom-background', 'default-color' ) === $color ) {
+		$color = false;
+	}
+
+	$type_attr = current_theme_supports( 'html5', 'style' ) ? '' : ' type="text/css"';
+
+	if ( ! $background && ! $color ) {
+		if ( is_customize_preview() ) {
+			printf( '<style%s id="custom-background-css"></style>', $type_attr );
+		}
+		return;
+	}
+
+	$style = $color ? "background-color: #$color;" : '';
+
+	if ( $background ) {
+		$image = ' background-image: url("' . sanitize_url( $background ) . '");';
+
+		// Background Position.
+		$position_x = get_theme_mod( 'background_position_x', get_theme_support( 'custom-background', 'default-position-x' ) );
+		$position_y = get_theme_mod( 'background_position_y', get_theme_support( 'custom-background', 'default-position-y' ) );
+
+		if ( ! in_array( $position_x, array( 'left', 'center', 'right' ), true ) ) {
+			$position_x = 'left';
+		}
+
+		if ( ! in_array( $position_y, array( 'top', 'center', 'bottom' ), true ) ) {
+			$position_y = 'top';
+		}
+
+		$position = " background-position: $position_x $position_y;";
+
+		// Background Size.
+		$size = get_theme_mod( 'background_size', get_theme_support( 'custom-background', 'default-size' ) );
+
+		if ( ! in_array( $size, array( 'auto', 'contain', 'cover' ), true ) ) {
+			$size = 'auto';
+		}
+
+		$size = " background-size: $size;";
+
+		// Background Repeat.
+		$repeat = get_theme_mod( 'background_repeat', get_theme_support( 'custom-background', 'default-repeat' ) );
+
+		if ( ! in_array( $repeat, array( 'repeat-x', 'repeat-y', 'repeat', 'no-repeat' ), true ) ) {
+			$repeat = 'repeat';
+		}
+
+		$repeat = " background-repeat: $repeat;";
+
+		// Background Scroll.
+		$attachment = get_theme_mod( 'background_attachment', get_theme_support( 'custom-background', 'default-attachment' ) );
+
+		if ( 'fixed' !== $attachment ) {
+			$attachment = 'scroll';
+		}
+
+		$attachment = " background-attachment: $attachment;";
+
+		$style .= $image . $position . $size . $repeat . $attachment;
+	}
+	?>
+<style<?php echo $type_attr; ?> id="custom-background-css">
+body.custom-background { <?php echo trim( $style ); ?> }
+</style>
+	<?php
+}
+
+/**
+ * Renders the Custom CSS style element.
+ *
+ * @since 4.7.0
+ */
+function wp_custom_css_cb() {
+	$styles = wp_get_custom_css();
+	if ( $styles || is_customize_preview() ) :
+		$type_attr = current_theme_supports( 'html5', 'style' ) ? '' : ' type="text/css"';
+		?>
+		<style<?php echo $type_attr; ?> id="wp-custom-css">
+			<?php
+			// Note that esc_html() cannot be used because `div &gt; span` is not interpreted properly.
+			echo strip_tags( $styles );
+			?>
+		</style>
+		<?php
+	endif;
+}
+
+/**
+ * Fetches the `custom_css` post for a given theme.
+ *
+ * @since 4.7.0
+ *
+ * @param string $stylesheet Optional. A theme object stylesheet name. Defaults to the active theme.
+ * @return WP_Post|null The custom_css post or null if none exists.
+ */
+function wp_get_custom_css_post( $stylesheet = '' ) {
+	if ( empty( $stylesheet ) ) {
+		$stylesheet = get_stylesheet();
+	}
+
+	$custom_css_query_vars = array(
+		'post_type'              => 'custom_css',
+		'post_status'            => get_post_stati(),
+		'name'                   => sanitize_title( $stylesheet ),
+		'posts_per_page'         => 1,
+		'no_found_rows'          => true,
+		'cache_results'          => true,
+		'update_post_meta_cache' => false,
+		'update_post_term_cache' => false,
+		'lazy_load_term_meta'    => false,
+	);
+
+	$post = null;
+	if ( get_stylesheet() === $stylesheet ) {
+		$post_id = get_theme_mod( 'custom_css_post_id' );
+
+		if ( $post_id > 0 && get_post( $post_id ) ) {
+			$post = get_post( $post_id );
+		}
+
+		// `-1` indicates no post exists; no query necessary.
+		if ( ! $post && -1 !== $post_id ) {
+			$query = new WP_Query( $custom_css_query_vars );
+			$post  = $query->post;
+			/*
+			 * Cache the lookup. See wp_update_custom_css_post().
+			 * @todo This should get cleared if a custom_css post is added/removed.
+			 */
+			set_theme_mod( 'custom_css_post_id', $post ? $post->ID : -1 );
+		}
+	} else {
+		$query = new WP_Query( $custom_css_query_vars );
+		$post  = $query->post;
+	}
+
+	return $post;
+}
+
+/**
+ * Fetches the saved Custom CSS content for rendering.
+ *
+ * @since 4.7.0
+ *
+ * @param string $stylesheet Optional. A theme object stylesheet name. Defaults to the active theme.
+ * @return string The Custom CSS Post content.
+ */
+function wp_get_custom_css( $stylesheet = '' ) {
+	$css = '';
+
+	if ( empty( $stylesheet ) ) {
+		$stylesheet = get_stylesheet();
+	}
+
+	$post = wp_get_custom_css_post( $stylesheet );
+	if ( $post ) {
+		$css = $post->post_content;
+	}
+
+	/**
+	 * Filters the custom CSS output into the head element.
+	 *
+	 * @since 4.7.0
+	 *
+	 * @param string $css        CSS pulled in from the Custom CSS post type.
+	 * @param string $stylesheet The theme stylesheet name.
+	 */
+	$css = apply_filters( 'wp_get_custom_css', $css, $stylesheet );
+
+	return $css;
+}
+
+/**
+ * Updates the `custom_css` post for a given theme.
+ *
+ * Inserts a `custom_css` post when one doesn't yet exist.
+ *
+ * @since 4.7.0
+ *
+ * @param string $css CSS, stored in `post_content`.
+ * @param array  $args {
+ *     Args.
+ *
+ *     @type string $preprocessed Optional. Pre-processed CSS, stored in `post_content_filtered`.
+ *                                Normally empty string.
+ *     @type string $stylesheet   Optional. Stylesheet (child theme) to update.
+ *                                Defaults to active theme/stylesheet.
+ * }
+ * @return WP_Post|WP_Error Post on success, error on failure.
+ */
+function wp_update_custom_css_post( $css, $args = array() ) {
+	$args = wp_parse_args(
+		$args,
+		array(
+			'preprocessed' => '',
+			'stylesheet'   => get_stylesheet(),
+		)
+	);
+
+	$data = array(
+		'css'          => $css,
+		'preprocessed' => $args['preprocessed'],
+	);
+
+	/**
+	 * Filters the `css` (`post_content`) and `preprocessed` (`post_content_filtered`) args
+	 * for a `custom_css` post being updated.
+	 *
+	 * This filter can be used by plugin that offer CSS pre-processors, to store the original
+	 * pre-processed CSS in `post_content_filtered` and then store processed CSS in `post_content`.
+	 * When used in this way, the `post_content_filtered` should be supplied as the setting value
+	 * instead of `post_content` via a the `customize_value_custom_css` filter, for example:
+	 *
+	 * <code>
+	 * add_filter( 'customize_value_custom_css', function( $value, $setting ) {
+	 *     $post = wp_get_custom_css_post( $setting->stylesheet );
+	 *     if ( $post && ! empty( $post->post_content_filtered ) ) {
+	 *         $css = $post->post_content_filtered;
+	 *     }
+	 *     return $css;
+	 * }, 10, 2 );
+	 * </code>
+	 *
+	 * @since 4.7.0
+	 * @param array $data {
+	 *     Custom CSS data.
+	 *
+	 *     @type string $css          CSS stored in `post_content`.
+	 *     @type string $preprocessed Pre-processed CSS stored in `post_content_filtered`.
+	 *                                Normally empty string.
+	 * }
+	 * @param array $args {
+	 *     The args passed into `wp_update_custom_css_post()` merged with defaults.
+	 *
+	 *     @type string $css          The original CSS passed in to be updated.
+	 *     @type string $preprocessed The original preprocessed CSS passed in to be updated.
+	 *     @type string $stylesheet   The stylesheet (theme) being updated.
+	 * }
+	 */
+	$data = apply_filters( 'update_custom_css_data', $data, array_merge( $args, compact( 'css' ) ) );
+
+	$post_data = array(
+		'post_title'            => $args['stylesheet'],
+		'post_name'             => sanitize_title( $args['stylesheet'] ),
+		'post_type'             => 'custom_css',
+		'post_status'           => 'publish',
+		'post_content'          => $data['css'],
+		'post_content_filtered' => $data['preprocessed'],
+	);
+
+	// Update post if it already exists, otherwise create a new one.
+	$post = wp_get_custom_css_post( $args['stylesheet'] );
+	if ( $post ) {
+		$post_data['ID'] = $post->ID;
+		$r               = wp_update_post( wp_slash( $post_data ), true );
+	} else {
+		$r = wp_insert_post( wp_slash( $post_data ), true );
+
+		if ( ! is_wp_error( $r ) ) {
+			if ( get_stylesheet() === $args['stylesheet'] ) {
+				set_theme_mod( 'custom_css_post_id', $r );
+			}
+
+			// Trigger creation of a revision. This should be removed once #30854 is resolved.
+			$revisions = wp_get_latest_revision_id_and_total_count( $r );
+			if ( ! is_wp_error( $revisions ) && 0 === $revisions['count'] ) {
+				wp_save_post_revision( $r );
+			}
+		}
+	}
+
+	if ( is_wp_error( $r ) ) {
+		return $r;
+	}
+	return get_post( $r );
+}
+
+/**
+ * Adds callback for custom TinyMCE editor stylesheets.
+ *
+ * The parameter $stylesheet is the name of the stylesheet, relative to
+ * the theme root. It also accepts an array of stylesheets.
+ * It is optional and defaults to 'editor-style.css'.
+ *
+ * This function automatically adds another stylesheet with -rtl prefix, e.g. editor-style-rtl.css.
+ * If that file doesn't exist, it is removed before adding the stylesheet(s) to TinyMCE.
+ * If an array of stylesheets is passed to add_editor_style(),
+ * RTL is only added for the first stylesheet.
+ *
+ * Since version 3.4 the TinyMCE body has .rtl CSS class.
+ * It is a better option to use that class and add any RTL styles to the main stylesheet.
+ *
+ * @since 3.0.0
+ *
+ * @global array $editor_styles
+ *
+ * @param array|string $stylesheet Optional. Stylesheet name or array thereof, relative to theme root.
+ *                                 Defaults to 'editor-style.css'
+ */
+function add_editor_style( $stylesheet = 'editor-style.css' ) {
+	global $editor_styles;
+
+	add_theme_support( 'editor-style' );
+
+	$editor_styles = (array) $editor_styles;
+	$stylesheet    = (array) $stylesheet;
+
+	if ( is_rtl() ) {
+		$rtl_stylesheet = str_replace( '.css', '-rtl.css', $stylesheet[0] );
+		$stylesheet[]   = $rtl_stylesheet;
+	}
+
+	$editor_styles = array_merge( $editor_styles, $stylesheet );
+}
+
+/**
+ * Removes all visual editor stylesheets.
+ *
+ * @since 3.1.0
+ *
+ * @global array $editor_styles
+ *
+ * @return bool True on success, false if there were no stylesheets to remove.
+ */
+function remove_editor_styles() {
+	if ( ! current_theme_supports( 'editor-style' ) ) {
+		return false;
+	}
+	_remove_theme_support( 'editor-style' );
+	if ( is_admin() ) {
+		$GLOBALS['editor_styles'] = array();
+	}
+	return true;
+}
+
+/**
+ * Retrieves any registered editor stylesheet URLs.
+ *
+ * @since 4.0.0
+ *
+ * @global array $editor_styles Registered editor stylesheets
+ *
+ * @return string[] If registered, a list of editor stylesheet URLs.
+ */
+function get_editor_stylesheets() {
+	$stylesheets = array();
+	// Load editor_style.css if the active theme supports it.
+	if ( ! empty( $GLOBALS['editor_styles'] ) && is_array( $GLOBALS['editor_styles'] ) ) {
+		$editor_styles = $GLOBALS['editor_styles'];
+
+		$editor_styles = array_unique( array_filter( $editor_styles ) );
+		$style_uri     = get_stylesheet_directory_uri();
+		$style_dir     = get_stylesheet_directory();
+
+		// Support externally referenced styles (like, say, fonts).
+		foreach ( $editor_styles as $key => $file ) {
+			if ( preg_match( '~^(https?:)?//~', $file ) ) {
+				$stylesheets[] = sanitize_url( $file );
+				unset( $editor_styles[ $key ] );
+			}
+		}
+
+		// Look in a parent theme first, that way child theme CSS overrides.
+		if ( is_child_theme() ) {
+			$template_uri = get_template_directory_uri();
+			$template_dir = get_template_directory();
+
+			foreach ( $editor_styles as $key => $file ) {
+				if ( $file && file_exists( "$template_dir/$file" ) ) {
+					$stylesheets[] = "$template_uri/$file";
+				}
+			}
+		}
+
+		foreach ( $editor_styles as $file ) {
+			if ( $file && file_exists( "$style_dir/$file" ) ) {
+				$stylesheets[] = "$style_uri/$file";
+			}
+		}
+	}
+
+	/**
+	 * Filters the array of URLs of stylesheets applied to the editor.
+	 *
+	 * @since 4.3.0
+	 *
+	 * @param string[] $stylesheets Array of URLs of stylesheets to be applied to the editor.
+	 */
+	return apply_filters( 'editor_stylesheets', $stylesheets );
+}
+
+/**
+ * Expands a theme's starter content configuration using core-provided data.
+ *
+ * @since 4.7.0
+ *
+ * @return array Array of starter content.
+ */
+function get_theme_starter_content() {
+	$theme_support = get_theme_support( 'starter-content' );
+	if ( is_array( $theme_support ) && ! empty( $theme_support[0] ) && is_array( $theme_support[0] ) ) {
+		$config = $theme_support[0];
+	} else {
+		$config = array();
+	}
+
+	$core_content = array(
+		'widgets'   => array(
+			'text_business_info' => array(
+				'text',
+				array(
+					'title'  => _x( 'Find Us', 'Theme starter content' ),
+					'text'   => implode(
+						'',
+						array(
+							'<strong>' . _x( 'Address', 'Theme starter content' ) . "</strong>\n",
+							_x( '123 Main Street', 'Theme starter content' ) . "\n",
+							_x( 'New York, NY 10001', 'Theme starter content' ) . "\n\n",
+							'<strong>' . _x( 'Hours', 'Theme starter content' ) . "</strong>\n",
+							_x( 'Monday&ndash;Friday: 9:00AM&ndash;5:00PM', 'Theme starter content' ) . "\n",
+							_x( 'Saturday &amp; Sunday: 11:00AM&ndash;3:00PM', 'Theme starter content' ),
+						)
+					),
+					'filter' => true,
+					'visual' => true,
+				),
+			),
+			'text_about'         => array(
+				'text',
+				array(
+					'title'  => _x( 'About This Site', 'Theme starter content' ),
+					'text'   => _x( 'This may be a good place to introduce yourself and your site or include some credits.', 'Theme starter content' ),
+					'filter' => true,
+					'visual' => true,
+				),
+			),
+			'archives'           => array(
+				'archives',
+				array(
+					'title' => _x( 'Archives', 'Theme starter content' ),
+				),
+			),
+			'calendar'           => array(
+				'calendar',
+				array(
+					'title' => _x( 'Calendar', 'Theme starter content' ),
+				),
+			),
+			'categories'         => array(
+				'categories',
+				array(
+					'title' => _x( 'Categories', 'Theme starter content' ),
+				),
+			),
+			'meta'               => array(
+				'meta',
+				array(
+					'title' => _x( 'Meta', 'Theme starter content' ),
+				),
+			),
+			'recent-comments'    => array(
+				'recent-comments',
+				array(
+					'title' => _x( 'Recent Comments', 'Theme starter content' ),
+				),
+			),
+			'recent-posts'       => array(
+				'recent-posts',
+				array(
+					'title' => _x( 'Recent Posts', 'Theme starter content' ),
+				),
+			),
+			'search'             => array(
+				'search',
+				array(
+					'title' => _x( 'Search', 'Theme starter content' ),
+				),
+			),
+		),
+		'nav_menus' => array(
+			'link_home'       => array(
+				'type'  => 'custom',
+				'title' => _x( 'Home', 'Theme starter content' ),
+				'url'   => home_url( '/' ),
+			),
+			'page_home'       => array( // Deprecated in favor of 'link_home'.
+				'type'      => 'post_type',
+				'object'    => 'page',
+				'object_id' => '{{home}}',
+			),
+			'page_about'      => array(
+				'type'      => 'post_type',
+				'object'    => 'page',
+				'object_id' => '{{about}}',
+			),
+			'page_blog'       => array(
+				'type'      => 'post_type',
+				'object'    => 'page',
+				'object_id' => '{{blog}}',
+			),
+			'page_news'       => array(
+				'type'      => 'post_type',
+				'object'    => 'page',
+				'object_id' => '{{news}}',
+			),
+			'page_contact'    => array(
+				'type'      => 'post_type',
+				'object'    => 'page',
+				'object_id' => '{{contact}}',
+			),
+
+			'link_email'      => array(
+				'title' => _x( 'Email', 'Theme starter content' ),
+				'url'   => 'mailto:wordpress@example.com',
+			),
+			'link_facebook'   => array(
+				'title' => _x( 'Facebook', 'Theme starter content' ),
+				'url'   => 'https://www.facebook.com/wordpress',
+			),
+			'link_foursquare' => array(
+				'title' => _x( 'Foursquare', 'Theme starter content' ),
+				'url'   => 'https://foursquare.com/',
+			),
+			'link_github'     => array(
+				'title' => _x( 'GitHub', 'Theme starter content' ),
+				'url'   => 'https://github.com/wordpress/',
+			),
+			'link_instagram'  => array(
+				'title' => _x( 'Instagram', 'Theme starter content' ),
+				'url'   => 'https://www.instagram.com/explore/tags/wordcamp/',
+			),
+			'link_linkedin'   => array(
+				'title' => _x( 'LinkedIn', 'Theme starter content' ),
+				'url'   => 'https://www.linkedin.com/company/1089783',
+			),
+			'link_pinterest'  => array(
+				'title' => _x( 'Pinterest', 'Theme starter content' ),
+				'url'   => 'https://www.pinterest.com/',
+			),
+			'link_twitter'    => array(
+				'title' => _x( 'Twitter', 'Theme starter content' ),
+				'url'   => 'https://twitter.com/wordpress',
+			),
+			'link_yelp'       => array(
+				'title' => _x( 'Yelp', 'Theme starter content' ),
+				'url'   => 'https://www.yelp.com',
+			),
+			'link_youtube'    => array(
+				'title' => _x( 'YouTube', 'Theme starter content' ),
+				'url'   => 'https://www.youtube.com/channel/UCdof4Ju7amm1chz1gi1T2ZA',
+			),
+		),
+		'posts'     => array(
+			'home'             => array(
+				'post_type'    => 'page',
+				'post_title'   => _x( 'Home', 'Theme starter content' ),
+				'post_content' => sprintf(
+					"<!-- wp:paragraph -->\n<p>%s</p>\n<!-- /wp:paragraph -->",
+					_x( 'Welcome to your site! This is your homepage, which is what most visitors will see when they come to your site for the first time.', 'Theme starter content' )
+				),
+			),
+			'about'            => array(
+				'post_type'    => 'page',
+				'post_title'   => _x( 'About', 'Theme starter content' ),
+				'post_content' => sprintf(
+					"<!-- wp:paragraph -->\n<p>%s</p>\n<!-- /wp:paragraph -->",
+					_x( 'You might be an artist who would like to introduce yourself and your work here or maybe you are a business with a mission to describe.', 'Theme starter content' )
+				),
+			),
+			'contact'          => array(
+				'post_type'    => 'page',
+				'post_title'   => _x( 'Contact', 'Theme starter content' ),
+				'post_content' => sprintf(
+					"<!-- wp:paragraph -->\n<p>%s</p>\n<!-- /wp:paragraph -->",
+					_x( 'This is a page with some basic contact information, such as an address and phone number. You might also try a plugin to add a contact form.', 'Theme starter content' )
+				),
+			),
+			'blog'             => array(
+				'post_type'  => 'page',
+				'post_title' => _x( 'Blog', 'Theme starter content' ),
+			),
+			'news'             => array(
+				'post_type'  => 'page',
+				'post_title' => _x( 'News', 'Theme starter content' ),
+			),
+
+			'homepage-section' => array(
+				'post_type'    => 'page',
+				'post_title'   => _x( 'A homepage section', 'Theme starter content' ),
+				'post_content' => sprintf(
+					"<!-- wp:paragraph -->\n<p>%s</p>\n<!-- /wp:paragraph -->",
+					_x( 'This is an example of a homepage section. Homepage sections can be any page other than the homepage itself, including the page that shows your latest blog posts.', 'Theme starter content' )
+				),
+			),
+		),
+	);
+
+	$content = array();
+
+	foreach ( $config as $type => $args ) {
+		switch ( $type ) {
+			// Use options and theme_mods as-is.
+			case 'options':
+			case 'theme_mods':
+				$content[ $type ] = $config[ $type ];
+				break;
+
+			// Widgets are grouped into sidebars.
+			case 'widgets':
+				foreach ( $config[ $type ] as $sidebar_id => $widgets ) {
+					foreach ( $widgets as $id => $widget ) {
+						if ( is_array( $widget ) ) {
+
+							// Item extends core content.
+							if ( ! empty( $core_content[ $type ][ $id ] ) ) {
+								$widget = array(
+									$core_content[ $type ][ $id ][0],
+									array_merge( $core_content[ $type ][ $id ][1], $widget ),
+								);
+							}
+
+							$content[ $type ][ $sidebar_id ][] = $widget;
+						} elseif ( is_string( $widget )
+							&& ! empty( $core_content[ $type ] )
+							&& ! empty( $core_content[ $type ][ $widget ] )
+						) {
+							$content[ $type ][ $sidebar_id ][] = $core_content[ $type ][ $widget ];
+						}
+					}
+				}
+				break;
+
+			// And nav menu items are grouped into nav menus.
+			case 'nav_menus':
+				foreach ( $config[ $type ] as $nav_menu_location => $nav_menu ) {
+
+					// Ensure nav menus get a name.
+					if ( empty( $nav_menu['name'] ) ) {
+						$nav_menu['name'] = $nav_menu_location;
+					}
+
+					$content[ $type ][ $nav_menu_location ]['name'] = $nav_menu['name'];
+
+					foreach ( $nav_menu['items'] as $id => $nav_menu_item ) {
+						if ( is_array( $nav_menu_item ) ) {
+
+							// Item extends core content.
+							if ( ! empty( $core_content[ $type ][ $id ] ) ) {
+								$nav_menu_item = array_merge( $core_content[ $type ][ $id ], $nav_menu_item );
+							}
+
+							$content[ $type ][ $nav_menu_location ]['items'][] = $nav_menu_item;
+						} elseif ( is_string( $nav_menu_item )
+							&& ! empty( $core_content[ $type ] )
+							&& ! empty( $core_content[ $type ][ $nav_menu_item ] )
+						) {
+							$content[ $type ][ $nav_menu_location ]['items'][] = $core_content[ $type ][ $nav_menu_item ];
+						}
+					}
+				}
+				break;
+
+			// Attachments are posts but have special treatment.
+			case 'attachments':
+				foreach ( $config[ $type ] as $id => $item ) {
+					if ( ! empty( $item['file'] ) ) {
+						$content[ $type ][ $id ] = $item;
+					}
+				}
+				break;
+
+			/*
+			 * All that's left now are posts (besides attachments).
+			 * Not a default case for the sake of clarity and future work.
+			 */
+			case 'posts':
+				foreach ( $config[ $type ] as $id => $item ) {
+					if ( is_array( $item ) ) {
+
+						// Item extends core content.
+						if ( ! empty( $core_content[ $type ][ $id ] ) ) {
+							$item = array_merge( $core_content[ $type ][ $id ], $item );
+						}
+
+						// Enforce a subset of fields.
+						$content[ $type ][ $id ] = wp_array_slice_assoc(
+							$item,
+							array(
+								'post_type',
+								'post_title',
+								'post_excerpt',
+								'post_name',
+								'post_content',
+								'menu_order',
+								'comment_status',
+								'thumbnail',
+								'template',
+							)
+						);
+					} elseif ( is_string( $item ) && ! empty( $core_content[ $type ][ $item ] ) ) {
+						$content[ $type ][ $item ] = $core_content[ $type ][ $item ];
+					}
+				}
+				break;
+		}
+	}
+
+	/**
+	 * Filters the expanded array of starter content.
+	 *
+	 * @since 4.7.0
+	 *
+	 * @param array $content Array of starter content.
+	 * @param array $config  Array of theme-specific starter content configuration.
+	 */
+	return apply_filters( 'get_theme_starter_content', $content, $config );
+}
+
+/**
+ * Registers theme support for a given feature.
+ *
+ * Must be called in the theme's functions.php file to work.
+ * If attached to a hook, it must be {@see 'after_setup_theme'}.
+ * The {@see 'init'} hook may be too late for some features.
+ *
+ * Example usage:
+ *
+ *     add_theme_support( 'title-tag' );
+ *     add_theme_support( 'custom-logo', array(
+ *         'height' => 480,
+ *         'width'  => 720,
+ *     ) );
+ *
+ * @since 2.9.0
+ * @since 3.4.0 The `custom-header-uploads` feature was deprecated.
+ * @since 3.6.0 The `html5` feature was added.
+ * @since 3.6.1 The `html5` feature requires an array of types to be passed. Defaults to
+ *              'comment-list', 'comment-form', 'search-form' for backward compatibility.
+ * @since 3.9.0 The `html5` feature now also accepts 'gallery' and 'caption'.
+ * @since 4.1.0 The `title-tag` feature was added.
+ * @since 4.5.0 The `customize-selective-refresh-widgets` feature was added.
+ * @since 4.7.0 The `starter-content` feature was added.
+ * @since 5.0.0 The `responsive-embeds`, `align-wide`, `dark-editor-style`, `disable-custom-colors`,
+ *              `disable-custom-font-sizes`, `editor-color-palette`, `editor-font-sizes`,
+ *              `editor-styles`, and `wp-block-styles` features were added.
+ * @since 5.3.0 The `html5` feature now also accepts 'script' and 'style'.
+ * @since 5.3.0 Formalized the existing and already documented `...$args` parameter
+ *              by adding it to the function signature.
+ * @since 5.5.0 The `core-block-patterns` feature was added and is enabled by default.
+ * @since 5.5.0 The `custom-logo` feature now also accepts 'unlink-homepage-logo'.
+ * @since 5.6.0 The `post-formats` feature warns if no array is passed as the second parameter.
+ * @since 5.8.0 The `widgets-block-editor` feature enables the Widgets block editor.
+ * @since 6.0.0 The `html5` feature warns if no array is passed as the second parameter.
+ *
+ * @global array $_wp_theme_features
+ *
+ * @param string $feature The feature being added. Likely core values include:
+ *                          - 'admin-bar'
+ *                          - 'align-wide'
+ *                          - 'automatic-feed-links'
+ *                          - 'core-block-patterns'
+ *                          - 'custom-background'
+ *                          - 'custom-header'
+ *                          - 'custom-line-height'
+ *                          - 'custom-logo'
+ *                          - 'customize-selective-refresh-widgets'
+ *                          - 'custom-spacing'
+ *                          - 'custom-units'
+ *                          - 'dark-editor-style'
+ *                          - 'disable-custom-colors'
+ *                          - 'disable-custom-font-sizes'
+ *                          - 'editor-color-palette'
+ *                          - 'editor-gradient-presets'
+ *                          - 'editor-font-sizes'
+ *                          - 'editor-styles'
+ *                          - 'featured-content'
+ *                          - 'html5'
+ *                          - 'menus'
+ *                          - 'post-formats'
+ *                          - 'post-thumbnails'
+ *                          - 'responsive-embeds'
+ *                          - 'starter-content'
+ *                          - 'title-tag'
+ *                          - 'wp-block-styles'
+ *                          - 'widgets'
+ *                          - 'widgets-block-editor'
+ * @param mixed  ...$args Optional extra arguments to pass along with certain features.
+ * @return void|false Void on success, false on failure.
+ */
+function add_theme_support( $feature, ...$args ) {
+	global $_wp_theme_features;
+
+	if ( ! $args ) {
+		$args = true;
+	}
+
+	switch ( $feature ) {
+		case 'post-thumbnails':
+			// All post types are already supported.
+			if ( true === get_theme_support( 'post-thumbnails' ) ) {
+				return;
+			}
+
+			/*
+			 * Merge post types with any that already declared their support
+			 * for post thumbnails.
+			 */
+			if ( isset( $args[0] ) && is_array( $args[0] ) && isset( $_wp_theme_features['post-thumbnails'] ) ) {
+				$args[0] = array_unique( array_merge( $_wp_theme_features['post-thumbnails'][0], $args[0] ) );
+			}
+
+			break;
+
+		case 'post-formats':
+			if ( isset( $args[0] ) && is_array( $args[0] ) ) {
+				$post_formats = get_post_format_slugs();
+				unset( $post_formats['standard'] );
+
+				$args[0] = array_intersect( $args[0], array_keys( $post_formats ) );
+			} else {
+				_doing_it_wrong(
+					"add_theme_support( 'post-formats' )",
+					__( 'You need to pass an array of post formats.' ),
+					'5.6.0'
+				);
+				return false;
+			}
+			break;
+
+		case 'html5':
+			// You can't just pass 'html5', you need to pass an array of types.
+			if ( empty( $args[0] ) || ! is_array( $args[0] ) ) {
+				_doing_it_wrong(
+					"add_theme_support( 'html5' )",
+					__( 'You need to pass an array of types.' ),
+					'3.6.1'
+				);
+
+				if ( ! empty( $args[0] ) && ! is_array( $args[0] ) ) {
+					return false;
+				}
+
+				// Build an array of types for back-compat.
+				$args = array( 0 => array( 'comment-list', 'comment-form', 'search-form' ) );
+			}
+
+			// Calling 'html5' again merges, rather than overwrites.
+			if ( isset( $_wp_theme_features['html5'] ) ) {
+				$args[0] = array_merge( $_wp_theme_features['html5'][0], $args[0] );
+			}
+			break;
+
+		case 'custom-logo':
+			if ( true === $args ) {
+				$args = array( 0 => array() );
+			}
+			$defaults = array(
+				'width'                => null,
+				'height'               => null,
+				'flex-width'           => false,
+				'flex-height'          => false,
+				'header-text'          => '',
+				'unlink-homepage-logo' => false,
+			);
+			$args[0]  = wp_parse_args( array_intersect_key( $args[0], $defaults ), $defaults );
+
+			// Allow full flexibility if no size is specified.
+			if ( is_null( $args[0]['width'] ) && is_null( $args[0]['height'] ) ) {
+				$args[0]['flex-width']  = true;
+				$args[0]['flex-height'] = true;
+			}
+			break;
+
+		case 'custom-header-uploads':
+			return add_theme_support( 'custom-header', array( 'uploads' => true ) );
+
+		case 'custom-header':
+			if ( true === $args ) {
+				$args = array( 0 => array() );
+			}
+
+			$defaults = array(
+				'default-image'          => '',
+				'random-default'         => false,
+				'width'                  => 0,
+				'height'                 => 0,
+				'flex-height'            => false,
+				'flex-width'             => false,
+				'default-text-color'     => '',
+				'header-text'            => true,
+				'uploads'                => true,
+				'wp-head-callback'       => '',
+				'admin-head-callback'    => '',
+				'admin-preview-callback' => '',
+				'video'                  => false,
+				'video-active-callback'  => 'is_front_page',
+			);
+
+			$jit = isset( $args[0]['__jit'] );
+			unset( $args[0]['__jit'] );
+
+			/*
+			 * Merge in data from previous add_theme_support() calls.
+			 * The first value registered wins. (A child theme is set up first.)
+			 */
+			if ( isset( $_wp_theme_features['custom-header'] ) ) {
+				$args[0] = wp_parse_args( $_wp_theme_features['custom-header'][0], $args[0] );
+			}
+
+			/*
+			 * Load in the defaults at the end, as we need to insure first one wins.
+			 * This will cause all constants to be defined, as each arg will then be set to the default.
+			 */
+			if ( $jit ) {
+				$args[0] = wp_parse_args( $args[0], $defaults );
+			}
+
+			/*
+			 * If a constant was defined, use that value. Otherwise, define the constant to ensure
+			 * the constant is always accurate (and is not defined later,  overriding our value).
+			 * As stated above, the first value wins.
+			 * Once we get to wp_loaded (just-in-time), define any constants we haven't already.
+			 * Constants are lame. Don't reference them. This is just for backward compatibility.
+			 */
+
+			if ( defined( 'NO_HEADER_TEXT' ) ) {
+				$args[0]['header-text'] = ! NO_HEADER_TEXT;
+			} elseif ( isset( $args[0]['header-text'] ) ) {
+				define( 'NO_HEADER_TEXT', empty( $args[0]['header-text'] ) );
+			}
+
+			if ( defined( 'HEADER_IMAGE_WIDTH' ) ) {
+				$args[0]['width'] = (int) HEADER_IMAGE_WIDTH;
+			} elseif ( isset( $args[0]['width'] ) ) {
+				define( 'HEADER_IMAGE_WIDTH', (int) $args[0]['width'] );
+			}
+
+			if ( defined( 'HEADER_IMAGE_HEIGHT' ) ) {
+				$args[0]['height'] = (int) HEADER_IMAGE_HEIGHT;
+			} elseif ( isset( $args[0]['height'] ) ) {
+				define( 'HEADER_IMAGE_HEIGHT', (int) $args[0]['height'] );
+			}
+
+			if ( defined( 'HEADER_TEXTCOLOR' ) ) {
+				$args[0]['default-text-color'] = HEADER_TEXTCOLOR;
+			} elseif ( isset( $args[0]['default-text-color'] ) ) {
+				define( 'HEADER_TEXTCOLOR', $args[0]['default-text-color'] );
+			}
+
+			if ( defined( 'HEADER_IMAGE' ) ) {
+				$args[0]['default-image'] = HEADER_IMAGE;
+			} elseif ( isset( $args[0]['default-image'] ) ) {
+				define( 'HEADER_IMAGE', $args[0]['default-image'] );
+			}
+
+			if ( $jit && ! empty( $args[0]['default-image'] ) ) {
+				$args[0]['random-default'] = false;
+			}
+
+			/*
+			 * If headers are supported, and we still don't have a defined width or height,
+			 * we have implicit flex sizes.
+			 */
+			if ( $jit ) {
+				if ( empty( $args[0]['width'] ) && empty( $args[0]['flex-width'] ) ) {
+					$args[0]['flex-width'] = true;
+				}
+				if ( empty( $args[0]['height'] ) && empty( $args[0]['flex-height'] ) ) {
+					$args[0]['flex-height'] = true;
+				}
+			}
+
+			break;
+
+		case 'custom-background':
+			if ( true === $args ) {
+				$args = array( 0 => array() );
+			}
+
+			$defaults = array(
+				'default-image'          => '',
+				'default-preset'         => 'default',
+				'default-position-x'     => 'left',
+				'default-position-y'     => 'top',
+				'default-size'           => 'auto',
+				'default-repeat'         => 'repeat',
+				'default-attachment'     => 'scroll',
+				'default-color'          => '',
+				'wp-head-callback'       => '_custom_background_cb',
+				'admin-head-callback'    => '',
+				'admin-preview-callback' => '',
+			);
+
+			$jit = isset( $args[0]['__jit'] );
+			unset( $args[0]['__jit'] );
+
+			// Merge in data from previous add_theme_support() calls. The first value registered wins.
+			if ( isset( $_wp_theme_features['custom-background'] ) ) {
+				$args[0] = wp_parse_args( $_wp_theme_features['custom-background'][0], $args[0] );
+			}
+
+			if ( $jit ) {
+				$args[0] = wp_parse_args( $args[0], $defaults );
+			}
+
+			if ( defined( 'BACKGROUND_COLOR' ) ) {
+				$args[0]['default-color'] = BACKGROUND_COLOR;
+			} elseif ( isset( $args[0]['default-color'] ) || $jit ) {
+				define( 'BACKGROUND_COLOR', $args[0]['default-color'] );
+			}
+
+			if ( defined( 'BACKGROUND_IMAGE' ) ) {
+				$args[0]['default-image'] = BACKGROUND_IMAGE;
+			} elseif ( isset( $args[0]['default-image'] ) || $jit ) {
+				define( 'BACKGROUND_IMAGE', $args[0]['default-image'] );
+			}
+
+			break;
+
+		// Ensure that 'title-tag' is accessible in the admin.
+		case 'title-tag':
+			// Can be called in functions.php but must happen before wp_loaded, i.e. not in header.php.
+			if ( did_action( 'wp_loaded' ) ) {
+				_doing_it_wrong(
+					"add_theme_support( 'title-tag' )",
+					sprintf(
+						/* translators: 1: title-tag, 2: wp_loaded */
+						__( 'Theme support for %1$s should be registered before the %2$s hook.' ),
+						'<code>title-tag</code>',
+						'<code>wp_loaded</code>'
+					),
+					'4.1.0'
+				);
+
+				return false;
+			}
+	}
+
+	$_wp_theme_features[ $feature ] = $args;
+}
+
+/**
+ * Registers the internal custom header and background routines.
+ *
+ * @since 3.4.0
+ * @access private
+ *
+ * @global Custom_Image_Header $custom_image_header
+ * @global Custom_Background   $custom_background
+ */
+function _custom_header_background_just_in_time() {
+	global $custom_image_header, $custom_background;
+
+	if ( current_theme_supports( 'custom-header' ) ) {
+		// In case any constants were defined after an add_custom_image_header() call, re-run.
+		add_theme_support( 'custom-header', array( '__jit' => true ) );
+
+		$args = get_theme_support( 'custom-header' );
+		if ( $args[0]['wp-head-callback'] ) {
+			add_action( 'wp_head', $args[0]['wp-head-callback'] );
+		}
+
+		if ( is_admin() ) {
+			require_once ABSPATH . 'wp-admin/includes/class-custom-image-header.php';
+			$custom_image_header = new Custom_Image_Header( $args[0]['admin-head-callback'], $args[0]['admin-preview-callback'] );
+		}
+	}
+
+	if ( current_theme_supports( 'custom-background' ) ) {
+		// In case any constants were defined after an add_custom_background() call, re-run.
+		add_theme_support( 'custom-background', array( '__jit' => true ) );
+
+		$args = get_theme_support( 'custom-background' );
+		add_action( 'wp_head', $args[0]['wp-head-callback'] );
+
+		if ( is_admin() ) {
+			require_once ABSPATH . 'wp-admin/includes/class-custom-background.php';
+			$custom_background = new Custom_Background( $args[0]['admin-head-callback'], $args[0]['admin-preview-callback'] );
+		}
+	}
+}
+
+/**
+ * Adds CSS to hide header text for custom logo, based on Customizer setting.
+ *
+ * @since 4.5.0
+ * @access private
+ */
+function _custom_logo_header_styles() {
+	if ( ! current_theme_supports( 'custom-header', 'header-text' )
+		&& get_theme_support( 'custom-logo', 'header-text' )
+		&& ! get_theme_mod( 'header_text', true )
+	) {
+		$classes = (array) get_theme_support( 'custom-logo', 'header-text' );
+		$classes = array_map( 'sanitize_html_class', $classes );
+		$classes = '.' . implode( ', .', $classes );
+
+		$type_attr = current_theme_supports( 'html5', 'style' ) ? '' : ' type="text/css"';
+		?>
+		<!-- Custom Logo: hide header text -->
+		<style id="custom-logo-css"<?php echo $type_attr; ?>>
+			<?php echo $classes; ?> {
+				position: absolute;
+				clip: rect(1px, 1px, 1px, 1px);
+			}
+		</style>
+		<?php
+	}
+}
+
+/**
+ * Gets the theme support arguments passed when registering that support.
+ *
+ * Example usage:
+ *
+ *     get_theme_support( 'custom-logo' );
+ *     get_theme_support( 'custom-header', 'width' );
+ *
+ * @since 3.1.0
+ * @since 5.3.0 Formalized the existing and already documented `...$args` parameter
+ *              by adding it to the function signature.
+ *
+ * @global array $_wp_theme_features
+ *
+ * @param string $feature The feature to check. See add_theme_support() for the list
+ *                        of possible values.
+ * @param mixed  ...$args Optional extra arguments to be checked against certain features.
+ * @return mixed The array of extra arguments or the value for the registered feature.
+ */
+function get_theme_support( $feature, ...$args ) {
+	global $_wp_theme_features;
+
+	if ( ! isset( $_wp_theme_features[ $feature ] ) ) {
+		return false;
+	}
+
+	if ( ! $args ) {
+		return $_wp_theme_features[ $feature ];
+	}
+
+	switch ( $feature ) {
+		case 'custom-logo':
+		case 'custom-header':
+		case 'custom-background':
+			if ( isset( $_wp_theme_features[ $feature ][0][ $args[0] ] ) ) {
+				return $_wp_theme_features[ $feature ][0][ $args[0] ];
+			}
+			return false;
+
+		default:
+			return $_wp_theme_features[ $feature ];
+	}
+}
+
+/**
+ * Allows a theme to de-register its support of a certain feature
+ *
+ * Should be called in the theme's functions.php file. Generally would
+ * be used for child themes to override support from the parent theme.
+ *
+ * @since 3.0.0
+ *
+ * @see add_theme_support()
+ *
+ * @param string $feature The feature being removed. See add_theme_support() for the list
+ *                        of possible values.
+ * @return bool|void Whether feature was removed.
+ */
+function remove_theme_support( $feature ) {
+	// Do not remove internal registrations that are not used directly by themes.
+	if ( in_array( $feature, array( 'editor-style', 'widgets', 'menus' ), true ) ) {
+		return false;
+	}
+
+	return _remove_theme_support( $feature );
+}
+
+/**
+ * Do not use. Removes theme support internally without knowledge of those not used
+ * by themes directly.
+ *
+ * @access private
+ * @since 3.1.0
+ * @global array               $_wp_theme_features
+ * @global Custom_Image_Header $custom_image_header
+ * @global Custom_Background   $custom_background
+ *
+ * @param string $feature The feature being removed. See add_theme_support() for the list
+ *                        of possible values.
+ * @return bool True if support was removed, false if the feature was not registered.
+ */
+function _remove_theme_support( $feature ) {
+	global $_wp_theme_features;
+
+	switch ( $feature ) {
+		case 'custom-header-uploads':
+			if ( ! isset( $_wp_theme_features['custom-header'] ) ) {
+				return false;
+			}
+			add_theme_support( 'custom-header', array( 'uploads' => false ) );
+			return; // Do not continue - custom-header-uploads no longer exists.
+	}
+
+	if ( ! isset( $_wp_theme_features[ $feature ] ) ) {
+		return false;
+	}
+
+	switch ( $feature ) {
+		case 'custom-header':
+			if ( ! did_action( 'wp_loaded' ) ) {
+				break;
+			}
+			$support = get_theme_support( 'custom-header' );
+			if ( isset( $support[0]['wp-head-callback'] ) ) {
+				remove_action( 'wp_head', $support[0]['wp-head-callback'] );
+			}
+			if ( isset( $GLOBALS['custom_image_header'] ) ) {
+				remove_action( 'admin_menu', array( $GLOBALS['custom_image_header'], 'init' ) );
+				unset( $GLOBALS['custom_image_header'] );
+			}
+			break;
+
+		case 'custom-background':
+			if ( ! did_action( 'wp_loaded' ) ) {
+				break;
+			}
+			$support = get_theme_support( 'custom-background' );
+			if ( isset( $support[0]['wp-head-callback'] ) ) {
+				remove_action( 'wp_head', $support[0]['wp-head-callback'] );
+			}
+			remove_action( 'admin_menu', array( $GLOBALS['custom_background'], 'init' ) );
+			unset( $GLOBALS['custom_background'] );
+			break;
+	}
+
+	unset( $_wp_theme_features[ $feature ] );
+
+	return true;
+}
+
+/**
+ * Checks a theme's support for a given feature.
+ *
+ * Example usage:
+ *
+ *     current_theme_supports( 'custom-logo' );
+ *     current_theme_supports( 'html5', 'comment-form' );
+ *
+ * @since 2.9.0
+ * @since 5.3.0 Formalized the existing and already documented `...$args` parameter
+ *              by adding it to the function signature.
+ *
+ * @global array $_wp_theme_features
+ *
+ * @param string $feature The feature being checked. See add_theme_support() for the list
+ *                        of possible values.
+ * @param mixed  ...$args Optional extra arguments to be checked against certain features.
+ * @return bool True if the active theme supports the feature, false otherwise.
+ */
+function current_theme_supports( $feature, ...$args ) {
+	global $_wp_theme_features;
+
+	if ( 'custom-header-uploads' === $feature ) {
+		return current_theme_supports( 'custom-header', 'uploads' );
+	}
+
+	if ( ! isset( $_wp_theme_features[ $feature ] ) ) {
+		return false;
+	}
+
+	// If no args passed then no extra checks need to be performed.
+	if ( ! $args ) {
+		/** This filter is documented in wp-includes/theme.php */
+		return apply_filters( "current_theme_supports-{$feature}", true, $args, $_wp_theme_features[ $feature ] ); // phpcs:ignore WordPress.NamingConventions.ValidHookName.UseUnderscores
+	}
+
+	switch ( $feature ) {
+		case 'post-thumbnails':
+			/*
+			 * post-thumbnails can be registered for only certain content/post types
+			 * by passing an array of types to add_theme_support().
+			 * If no array was passed, then any type is accepted.
+			 */
+			if ( true === $_wp_theme_features[ $feature ] ) {  // Registered for all types.
+				return true;
+			}
+			$content_type = $args[0];
+			return in_array( $content_type, $_wp_theme_features[ $feature ][0], true );
+
+		case 'html5':
+		case 'post-formats':
+			/*
+			 * Specific post formats can be registered by passing an array of types
+			 * to add_theme_support().
+			 *
+			 * Specific areas of HTML5 support *must* be passed via an array to add_theme_support().
+			 */
+			$type = $args[0];
+			return in_array( $type, $_wp_theme_features[ $feature ][0], true );
+
+		case 'custom-logo':
+		case 'custom-header':
+		case 'custom-background':
+			// Specific capabilities can be registered by passing an array to add_theme_support().
+			return ( isset( $_wp_theme_features[ $feature ][0][ $args[0] ] ) && $_wp_theme_features[ $feature ][0][ $args[0] ] );
+	}
+
+	/**
+	 * Filters whether the active theme supports a specific feature.
+	 *
+	 * The dynamic portion of the hook name, `$feature`, refers to the specific
+	 * theme feature. See add_theme_support() for the list of possible values.
+	 *
+	 * @since 3.4.0
+	 *
+	 * @param bool   $supports Whether the active theme supports the given feature. Default true.
+	 * @param array  $args     Array of arguments for the feature.
+	 * @param string $feature  The theme feature.
+	 */
+	return apply_filters( "current_theme_supports-{$feature}", true, $args, $_wp_theme_features[ $feature ] ); // phpcs:ignore WordPress.NamingConventions.ValidHookName.UseUnderscores
+}
+
+/**
+ * Checks a theme's support for a given feature before loading the functions which implement it.
+ *
+ * @since 2.9.0
+ *
+ * @param string $feature The feature being checked. See add_theme_support() for the list
+ *                        of possible values.
+ * @param string $file    Path to the file.
+ * @return bool True if the active theme supports the supplied feature, false otherwise.
+ */
+function require_if_theme_supports( $feature, $file ) {
+	if ( current_theme_supports( $feature ) ) {
+		require $file;
+		return true;
+	}
+	return false;
+}
+
+/**
+ * Registers a theme feature for use in add_theme_support().
+ *
+ * This does not indicate that the active theme supports the feature, it only describes
+ * the feature's supported options.
+ *
+ * @since 5.5.0
+ *
+ * @see add_theme_support()
+ *
+ * @global array $_wp_registered_theme_features
+ *
+ * @param string $feature The name uniquely identifying the feature. See add_theme_support()
+ *                        for the list of possible values.
+ * @param array  $args {
+ *     Data used to describe the theme.
+ *
+ *     @type string     $type         The type of data associated with this feature.
+ *                                    Valid values are 'string', 'boolean', 'integer',
+ *                                    'number', 'array', and 'object'. Defaults to 'boolean'.
+ *     @type bool       $variadic     Does this feature utilize the variadic support
+ *                                    of add_theme_support(), or are all arguments specified
+ *                                    as the second parameter. Must be used with the "array" type.
+ *     @type string     $description  A short description of the feature. Included in
+ *                                    the Themes REST API schema. Intended for developers.
+ *     @type bool|array $show_in_rest {
+ *         Whether this feature should be included in the Themes REST API endpoint.
+ *         Defaults to not being included. When registering an 'array' or 'object' type,
+ *         this argument must be an array with the 'schema' key.
+ *
+ *         @type array    $schema           Specifies the JSON Schema definition describing
+ *                                          the feature. If any objects in the schema do not include
+ *                                          the 'additionalProperties' keyword, it is set to false.
+ *         @type string   $name             An alternate name to be used as the property name
+ *                                          in the REST API.
+ *         @type callable $prepare_callback A function used to format the theme support in the REST API.
+ *                                          Receives the raw theme support value.
+ *      }
+ * }
+ * @return true|WP_Error True if the theme feature was successfully registered, a WP_Error object if not.
+ */
+function register_theme_feature( $feature, $args = array() ) {
+	global $_wp_registered_theme_features;
+
+	if ( ! is_array( $_wp_registered_theme_features ) ) {
+		$_wp_registered_theme_features = array();
+	}
+
+	$defaults = array(
+		'type'         => 'boolean',
+		'variadic'     => false,
+		'description'  => '',
+		'show_in_rest' => false,
+	);
+
+	$args = wp_parse_args( $args, $defaults );
+
+	if ( true === $args['show_in_rest'] ) {
+		$args['show_in_rest'] = array();
+	}
+
+	if ( is_array( $args['show_in_rest'] ) ) {
+		$args['show_in_rest'] = wp_parse_args(
+			$args['show_in_rest'],
+			array(
+				'schema'           => array(),
+				'name'             => $feature,
+				'prepare_callback' => null,
+			)
+		);
+	}
+
+	if ( ! in_array( $args['type'], array( 'string', 'boolean', 'integer', 'number', 'array', 'object' ), true ) ) {
+		return new WP_Error(
+			'invalid_type',
+			__( 'The feature "type" is not valid JSON Schema type.' )
+		);
+	}
+
+	if ( true === $args['variadic'] && 'array' !== $args['type'] ) {
+		return new WP_Error(
+			'variadic_must_be_array',
+			__( 'When registering a "variadic" theme feature, the "type" must be an "array".' )
+		);
+	}
+
+	if ( false !== $args['show_in_rest'] && in_array( $args['type'], array( 'array', 'object' ), true ) ) {
+		if ( ! is_array( $args['show_in_rest'] ) || empty( $args['show_in_rest']['schema'] ) ) {
+			return new WP_Error(
+				'missing_schema',
+				__( 'When registering an "array" or "object" feature to show in the REST API, the feature\'s schema must also be defined.' )
+			);
+		}
+
+		if ( 'array' === $args['type'] && ! isset( $args['show_in_rest']['schema']['items'] ) ) {
+			return new WP_Error(
+				'missing_schema_items',
+				__( 'When registering an "array" feature, the feature\'s schema must include the "items" keyword.' )
+			);
+		}
+
+		if ( 'object' === $args['type'] && ! isset( $args['show_in_rest']['schema']['properties'] ) ) {
+			return new WP_Error(
+				'missing_schema_properties',
+				__( 'When registering an "object" feature, the feature\'s schema must include the "properties" keyword.' )
+			);
+		}
+	}
+
+	if ( is_array( $args['show_in_rest'] ) ) {
+		if ( isset( $args['show_in_rest']['prepare_callback'] )
+			&& ! is_callable( $args['show_in_rest']['prepare_callback'] )
+		) {
+			return new WP_Error(
+				'invalid_rest_prepare_callback',
+				sprintf(
+					/* translators: %s: prepare_callback */
+					__( 'The "%s" must be a callable function.' ),
+					'prepare_callback'
+				)
+			);
+		}
+
+		$args['show_in_rest']['schema'] = wp_parse_args(
+			$args['show_in_rest']['schema'],
+			array(
+				'description' => $args['description'],
+				'type'        => $args['type'],
+				'default'     => false,
+			)
+		);
+
+		if ( is_bool( $args['show_in_rest']['schema']['default'] )
+			&& ! in_array( 'boolean', (array) $args['show_in_rest']['schema']['type'], true )
+		) {
+			// Automatically include the "boolean" type when the default value is a boolean.
+			$args['show_in_rest']['schema']['type'] = (array) $args['show_in_rest']['schema']['type'];
+			array_unshift( $args['show_in_rest']['schema']['type'], 'boolean' );
+		}
+
+		$args['show_in_rest']['schema'] = rest_default_additional_properties_to_false( $args['show_in_rest']['schema'] );
+	}
+
+	$_wp_registered_theme_features[ $feature ] = $args;
+
+	return true;
+}
+
+/**
+ * Gets the list of registered theme features.
+ *
+ * @since 5.5.0
+ *
+ * @global array $_wp_registered_theme_features
+ *
+ * @return array[] List of theme features, keyed by their name.
+ */
+function get_registered_theme_features() {
+	global $_wp_registered_theme_features;
+
+	if ( ! is_array( $_wp_registered_theme_features ) ) {
+		return array();
+	}
+
+	return $_wp_registered_theme_features;
+}
+
+/**
+ * Gets the registration config for a theme feature.
+ *
+ * @since 5.5.0
+ *
+ * @global array $_wp_registered_theme_features
+ *
+ * @param string $feature The feature name. See add_theme_support() for the list
+ *                        of possible values.
+ * @return array|null The registration args, or null if the feature was not registered.
+ */
+function get_registered_theme_feature( $feature ) {
+	global $_wp_registered_theme_features;
+
+	if ( ! is_array( $_wp_registered_theme_features ) ) {
+		return null;
+	}
+
+	return isset( $_wp_registered_theme_features[ $feature ] ) ? $_wp_registered_theme_features[ $feature ] : null;
+}
+
+/**
+ * Checks an attachment being deleted to see if it's a header or background image.
+ *
+ * If true it removes the theme modification which would be pointing at the deleted
+ * attachment.
+ *
+ * @access private
+ * @since 3.0.0
+ * @since 4.3.0 Also removes `header_image_data`.
+ * @since 4.5.0 Also removes custom logo theme mods.
+ *
+ * @param int $id The attachment ID.
+ */
+function _delete_attachment_theme_mod( $id ) {
+	$attachment_image = wp_get_attachment_url( $id );
+	$header_image     = get_header_image();
+	$background_image = get_background_image();
+	$custom_logo_id   = get_theme_mod( 'custom_logo' );
+
+	if ( $custom_logo_id && $custom_logo_id == $id ) {
+		remove_theme_mod( 'custom_logo' );
+		remove_theme_mod( 'header_text' );
+	}
+
+	if ( $header_image && $header_image == $attachment_image ) {
+		remove_theme_mod( 'header_image' );
+		remove_theme_mod( 'header_image_data' );
+	}
+
+	if ( $background_image && $background_image == $attachment_image ) {
+		remove_theme_mod( 'background_image' );
+	}
+}
+
+/**
+ * Checks if a theme has been changed and runs 'after_switch_theme' hook on the next WP load.
+ *
+ * See {@see 'after_switch_theme'}.
+ *
+ * @since 3.3.0
+ */
+function check_theme_switched() {
+	$stylesheet = get_option( 'theme_switched' );
+
+	if ( $stylesheet ) {
+		$old_theme = wp_get_theme( $stylesheet );
+
+		// Prevent widget & menu mapping from running since Customizer already called it up front.
+		if ( get_option( 'theme_switched_via_customizer' ) ) {
+			remove_action( 'after_switch_theme', '_wp_menus_changed' );
+			remove_action( 'after_switch_theme', '_wp_sidebars_changed' );
+			update_option( 'theme_switched_via_customizer', false );
+		}
+
+		if ( $old_theme->exists() ) {
+			/**
+			 * Fires on the next WP load after the theme has been switched.
+			 *
+			 * The parameters differ according to whether the old theme exists or not.
+			 * If the old theme is missing, the old name will instead be the slug
+			 * of the old theme.
+			 *
+			 * See {@see 'switch_theme'}.
+			 *
+			 * @since 3.3.0
+			 *
+			 * @param string   $old_name  Old theme name.
+			 * @param WP_Theme $old_theme WP_Theme instance of the old theme.
+			 */
+			do_action( 'after_switch_theme', $old_theme->get( 'Name' ), $old_theme );
+		} else {
+			/** This action is documented in wp-includes/theme.php */
+			do_action( 'after_switch_theme', $stylesheet, $old_theme );
+		}
+
+		flush_rewrite_rules();
+
+		update_option( 'theme_switched', false );
+	}
+}
+
+/**
+ * Includes and instantiates the WP_Customize_Manager class.
+ *
+ * Loads the Customizer at plugins_loaded when accessing the customize.php admin
+ * page or when any request includes a wp_customize=on param or a customize_changeset
+ * param (a UUID). This param is a signal for whether to bootstrap the Customizer when
+ * WordPress is loading, especially in the Customizer preview
+ * or when making Customizer Ajax requests for widgets or menus.
+ *
+ * @since 3.4.0
+ *
+ * @global WP_Customize_Manager $wp_customize
+ */
+function _wp_customize_include() {
+
+	$is_customize_admin_page = ( is_admin() && 'customize.php' === basename( $_SERVER['PHP_SELF'] ) );
+	$should_include          = (
+		$is_customize_admin_page
+		||
+		( isset( $_REQUEST['wp_customize'] ) && 'on' === $_REQUEST['wp_customize'] )
+		||
+		( ! empty( $_GET['customize_changeset_uuid'] ) || ! empty( $_POST['customize_changeset_uuid'] ) )
+	);
+
+	if ( ! $should_include ) {
+		return;
+	}
+
+	/*
+	 * Note that wp_unslash() is not being used on the input vars because it is
+	 * called before wp_magic_quotes() gets called. Besides this fact, none of
+	 * the values should contain any characters needing slashes anyway.
+	 */
+	$keys       = array(
+		'changeset_uuid',
+		'customize_changeset_uuid',
+		'customize_theme',
+		'theme',
+		'customize_messenger_channel',
+		'customize_autosaved',
+	);
+	$input_vars = array_merge(
+		wp_array_slice_assoc( $_GET, $keys ),
+		wp_array_slice_assoc( $_POST, $keys )
+	);
+
+	$theme             = null;
+	$autosaved         = null;
+	$messenger_channel = null;
+
+	/*
+	 * Value false indicates UUID should be determined after_setup_theme
+	 * to either re-use existing saved changeset or else generate a new UUID if none exists.
+	 */
+	$changeset_uuid = false;
+
+	/*
+	 * Set initially fo false since defaults to true for back-compat;
+	 * can be overridden via the customize_changeset_branching filter.
+	 */
+	$branching = false;
+
+	if ( $is_customize_admin_page && isset( $input_vars['changeset_uuid'] ) ) {
+		$changeset_uuid = sanitize_key( $input_vars['changeset_uuid'] );
+	} elseif ( ! empty( $input_vars['customize_changeset_uuid'] ) ) {
+		$changeset_uuid = sanitize_key( $input_vars['customize_changeset_uuid'] );
+	}
+
+	// Note that theme will be sanitized via WP_Theme.
+	if ( $is_customize_admin_page && isset( $input_vars['theme'] ) ) {
+		$theme = $input_vars['theme'];
+	} elseif ( isset( $input_vars['customize_theme'] ) ) {
+		$theme = $input_vars['customize_theme'];
+	}
+
+	if ( ! empty( $input_vars['customize_autosaved'] ) ) {
+		$autosaved = true;
+	}
+
+	if ( isset( $input_vars['customize_messenger_channel'] ) ) {
+		$messenger_channel = sanitize_key( $input_vars['customize_messenger_channel'] );
+	}
+
+	/*
+	 * Note that settings must be previewed even outside the customizer preview
+	 * and also in the customizer pane itself. This is to enable loading an existing
+	 * changeset into the customizer. Previewing the settings only has to be prevented
+	 * here in the case of a customize_save action because this will cause WP to think
+	 * there is nothing changed that needs to be saved.
+	 */
+	$is_customize_save_action = (
+		wp_doing_ajax()
+		&&
+		isset( $_REQUEST['action'] )
+		&&
+		'customize_save' === wp_unslash( $_REQUEST['action'] )
+	);
+	$settings_previewed       = ! $is_customize_save_action;
+
+	require_once ABSPATH . WPINC . '/class-wp-customize-manager.php';
+	$GLOBALS['wp_customize'] = new WP_Customize_Manager(
+		compact(
+			'changeset_uuid',
+			'theme',
+			'messenger_channel',
+			'settings_previewed',
+			'autosaved',
+			'branching'
+		)
+	);
+}
+
+/**
+ * Publishes a snapshot's changes.
+ *
+ * @since 4.7.0
+ * @access private
+ *
+ * @global wpdb                 $wpdb         WordPress database abstraction object.
+ * @global WP_Customize_Manager $wp_customize Customizer instance.
+ *
+ * @param string  $new_status     New post status.
+ * @param string  $old_status     Old post status.
+ * @param WP_Post $changeset_post Changeset post object.
+ */
+function _wp_customize_publish_changeset( $new_status, $old_status, $changeset_post ) {
+	global $wp_customize, $wpdb;
+
+	$is_publishing_changeset = (
+		'customize_changeset' === $changeset_post->post_type
+		&&
+		'publish' === $new_status
+		&&
+		'publish' !== $old_status
+	);
+	if ( ! $is_publishing_changeset ) {
+		return;
+	}
+
+	if ( empty( $wp_customize ) ) {
+		require_once ABSPATH . WPINC . '/class-wp-customize-manager.php';
+		$wp_customize = new WP_Customize_Manager(
+			array(
+				'changeset_uuid'     => $changeset_post->post_name,
+				'settings_previewed' => false,
+			)
+		);
+	}
+
+	if ( ! did_action( 'customize_register' ) ) {
+		/*
+		 * When running from CLI or Cron, the customize_register action will need
+		 * to be triggered in order for core, themes, and plugins to register their
+		 * settings. Normally core will add_action( 'customize_register' ) at
+		 * priority 10 to register the core settings, and if any themes/plugins
+		 * also add_action( 'customize_register' ) at the same priority, they
+		 * will have a $wp_customize with those settings registered since they
+		 * call add_action() afterward, normally. However, when manually doing
+		 * the customize_register action after the setup_theme, then the order
+		 * will be reversed for two actions added at priority 10, resulting in
+		 * the core settings no longer being available as expected to themes/plugins.
+		 * So the following manually calls the method that registers the core
+		 * settings up front before doing the action.
+		 */
+		remove_action( 'customize_register', array( $wp_customize, 'register_controls' ) );
+		$wp_customize->register_controls();
+
+		/** This filter is documented in wp-includes/class-wp-customize-manager.php */
+		do_action( 'customize_register', $wp_customize );
+	}
+	$wp_customize->_publish_changeset_values( $changeset_post->ID );
+
+	/*
+	 * Trash the changeset post if revisions are not enabled. Unpublished
+	 * changesets by default get garbage collected due to the auto-draft status.
+	 * When a changeset post is published, however, it would no longer get cleaned
+	 * out. This is a problem when the changeset posts are never displayed anywhere,
+	 * since they would just be endlessly piling up. So here we use the revisions
+	 * feature to indicate whether or not a published changeset should get trashed
+	 * and thus garbage collected.
+	 */
+	if ( ! wp_revisions_enabled( $changeset_post ) ) {
+		$wp_customize->trash_changeset_post( $changeset_post->ID );
+	}
+}
+
+/**
+ * Filters changeset post data upon insert to ensure post_name is intact.
+ *
+ * This is needed to prevent the post_name from being dropped when the post is
+ * transitioned into pending status by a contributor.
+ *
+ * @since 4.7.0
+ *
+ * @see wp_insert_post()
+ *
+ * @param array $post_data          An array of slashed post data.
+ * @param array $supplied_post_data An array of sanitized, but otherwise unmodified post data.
+ * @return array Filtered data.
+ */
+function _wp_customize_changeset_filter_insert_post_data( $post_data, $supplied_post_data ) {
+	if ( isset( $post_data['post_type'] ) && 'customize_changeset' === $post_data['post_type'] ) {
+
+		// Prevent post_name from being dropped, such as when contributor saves a changeset post as pending.
+		if ( empty( $post_data['post_name'] ) && ! empty( $supplied_post_data['post_name'] ) ) {
+			$post_data['post_name'] = $supplied_post_data['post_name'];
+		}
+	}
+	return $post_data;
+}
+
+/**
+ * Adds settings for the customize-loader script.
+ *
+ * @since 3.4.0
+ */
+function _wp_customize_loader_settings() {
+	$admin_origin = parse_url( admin_url() );
+	$home_origin  = parse_url( home_url() );
+	$cross_domain = ( strtolower( $admin_origin['host'] ) !== strtolower( $home_origin['host'] ) );
+
+	$browser = array(
+		'mobile' => wp_is_mobile(),
+		'ios'    => wp_is_mobile() && preg_match( '/iPad|iPod|iPhone/', $_SERVER['HTTP_USER_AGENT'] ),
+	);
+
+	$settings = array(
+		'url'           => esc_url( admin_url( 'customize.php' ) ),
+		'isCrossDomain' => $cross_domain,
+		'browser'       => $browser,
+		'l10n'          => array(
+			'saveAlert'       => __( 'The changes you made will be lost if you navigate away from this page.' ),
+			'mainIframeTitle' => __( 'Customizer' ),
+		),
+	);
+
+	$script = 'var _wpCustomizeLoaderSettings = ' . wp_json_encode( $settings ) . ';';
+
+	$wp_scripts = wp_scripts();
+	$data       = $wp_scripts->get_data( 'customize-loader', 'data' );
+	if ( $data ) {
+		$script = "$data\n$script";
+	}
+
+	$wp_scripts->add_data( 'customize-loader', 'data', $script );
+}
+
+/**
+ * Returns a URL to load the Customizer.
+ *
+ * @since 3.4.0
+ *
+ * @param string $stylesheet Optional. Theme to customize. Defaults to active theme.
+ *                           The theme's stylesheet will be urlencoded if necessary.
+ * @return string
+ */
+function wp_customize_url( $stylesheet = '' ) {
+	$url = admin_url( 'customize.php' );
+	if ( $stylesheet ) {
+		$url .= '?theme=' . urlencode( $stylesheet );
+	}
+	return esc_url( $url );
+}
+
+/**
+ * Prints a script to check whether or not the Customizer is supported,
+ * and apply either the no-customize-support or customize-support class
+ * to the body.
+ *
+ * This function MUST be called inside the body tag.
+ *
+ * Ideally, call this function immediately after the body tag is opened.
+ * This prevents a flash of unstyled content.
+ *
+ * It is also recommended that you add the "no-customize-support" class
+ * to the body tag by default.
+ *
+ * @since 3.4.0
+ * @since 4.7.0 Support for IE8 and below is explicitly removed via conditional comments.
+ * @since 5.5.0 IE8 and older are no longer supported.
+ */
+function wp_customize_support_script() {
+	$admin_origin = parse_url( admin_url() );
+	$home_origin  = parse_url( home_url() );
+	$cross_domain = ( strtolower( $admin_origin['host'] ) !== strtolower( $home_origin['host'] ) );
+	ob_start();
+	?>
+	<script>
+		(function() {
+			var request, b = document.body, c = 'className', cs = 'customize-support', rcs = new RegExp('(^|\\s+)(no-)?'+cs+'(\\s+|$)');
+
+	<?php	if ( $cross_domain ) : ?>
+			request = (function(){ var xhr = new XMLHttpRequest(); return ('withCredentials' in xhr); })();
+	<?php	else : ?>
+			request = true;
+	<?php	endif; ?>
+
+			b[c] = b[c].replace( rcs, ' ' );
+			// The customizer requires postMessage and CORS (if the site is cross domain).
+			b[c] += ( window.postMessage && request ? ' ' : ' no-' ) + cs;
+		}());
+	</script>
+	<?php
+	wp_print_inline_script_tag( wp_remove_surrounding_empty_script_tags( ob_get_clean() ) );
+}
+
+/**
+ * Whether the site is being previewed in the Customizer.
+ *
+ * @since 4.0.0
+ *
+ * @global WP_Customize_Manager $wp_customize Customizer instance.
+ *
+ * @return bool True if the site is being previewed in the Customizer, false otherwise.
+ */
+function is_customize_preview() {
+	global $wp_customize;
+
+	return ( $wp_customize instanceof WP_Customize_Manager ) && $wp_customize->is_preview();
+}
+
+/**
+ * Makes sure that auto-draft posts get their post_date bumped or status changed
+ * to draft to prevent premature garbage-collection.
+ *
+ * When a changeset is updated but remains an auto-draft, ensure the post_date
+ * for the auto-draft posts remains the same so that it will be
+ * garbage-collected at the same time by `wp_delete_auto_drafts()`. Otherwise,
+ * if the changeset is updated to be a draft then update the posts
+ * to have a far-future post_date so that they will never be garbage collected
+ * unless the changeset post itself is deleted.
+ *
+ * When a changeset is updated to be a persistent draft or to be scheduled for
+ * publishing, then transition any dependent auto-drafts to a draft status so
+ * that they likewise will not be garbage-collected but also so that they can
+ * be edited in the admin before publishing since there is not yet a post/page
+ * editing flow in the Customizer. See #39752.
+ *
+ * @link https://core.trac.wordpress.org/ticket/39752
+ *
+ * @since 4.8.0
+ * @access private
+ * @see wp_delete_auto_drafts()
+ *
+ * @global wpdb $wpdb WordPress database abstraction object.
+ *
+ * @param string   $new_status Transition to this post status.
+ * @param string   $old_status Previous post status.
+ * @param \WP_Post $post       Post data.
+ */
+function _wp_keep_alive_customize_changeset_dependent_auto_drafts( $new_status, $old_status, $post ) {
+	global $wpdb;
+	unset( $old_status );
+
+	// Short-circuit if not a changeset or if the changeset was published.
+	if ( 'customize_changeset' !== $post->post_type || 'publish' === $new_status ) {
+		return;
+	}
+
+	$data = json_decode( $post->post_content, true );
+	if ( empty( $data['nav_menus_created_posts']['value'] ) ) {
+		return;
+	}
+
+	/*
+	 * Actually, in lieu of keeping alive, trash any customization drafts here if the changeset itself is
+	 * getting trashed. This is needed because when a changeset transitions to a draft, then any of the
+	 * dependent auto-draft post/page stubs will also get transitioned to customization drafts which
+	 * are then visible in the WP Admin. We cannot wait for the deletion of the changeset in which
+	 * _wp_delete_customize_changeset_dependent_auto_drafts() will be called, since they need to be
+	 * trashed to remove from visibility immediately.
+	 */
+	if ( 'trash' === $new_status ) {
+		foreach ( $data['nav_menus_created_posts']['value'] as $post_id ) {
+			if ( ! empty( $post_id ) && 'draft' === get_post_status( $post_id ) ) {
+				wp_trash_post( $post_id );
+			}
+		}
+		return;
+	}
+
+	$post_args = array();
+	if ( 'auto-draft' === $new_status ) {
+		/*
+		 * Keep the post date for the post matching the changeset
+		 * so that it will not be garbage-collected before the changeset.
+		 */
+		$post_args['post_date'] = $post->post_date; // Note wp_delete_auto_drafts() only looks at this date.
+	} else {
+		/*
+		 * Since the changeset no longer has an auto-draft (and it is not published)
+		 * it is now a persistent changeset, a long-lived draft, and so any
+		 * associated auto-draft posts should likewise transition into having a draft
+		 * status. These drafts will be treated differently than regular drafts in
+		 * that they will be tied to the given changeset. The publish meta box is
+		 * replaced with a notice about how the post is part of a set of customized changes
+		 * which will be published when the changeset is published.
+		 */
+		$post_args['post_status'] = 'draft';
+	}
+
+	foreach ( $data['nav_menus_created_posts']['value'] as $post_id ) {
+		if ( empty( $post_id ) || 'auto-draft' !== get_post_status( $post_id ) ) {
+			continue;
+		}
+		$wpdb->update(
+			$wpdb->posts,
+			$post_args,
+			array( 'ID' => $post_id )
+		);
+		clean_post_cache( $post_id );
+	}
+}
+
+/**
+ * Creates the initial theme features when the 'setup_theme' action is fired.
+ *
+ * See {@see 'setup_theme'}.
+ *
+ * @since 5.5.0
+ * @since 6.0.1 The `block-templates` feature was added.
+ */
+function create_initial_theme_features() {
+	register_theme_feature(
+		'align-wide',
+		array(
+			'description'  => __( 'Whether theme opts in to wide alignment CSS class.' ),
+			'show_in_rest' => true,
+		)
+	);
+	register_theme_feature(
+		'automatic-feed-links',
+		array(
+			'description'  => __( 'Whether posts and comments RSS feed links are added to head.' ),
+			'show_in_rest' => true,
+		)
+	);
+	register_theme_feature(
+		'block-templates',
+		array(
+			'description'  => __( 'Whether a theme uses block-based templates.' ),
+			'show_in_rest' => true,
+		)
+	);
+	register_theme_feature(
+		'block-template-parts',
+		array(
+			'description'  => __( 'Whether a theme uses block-based template parts.' ),
+			'show_in_rest' => true,
+		)
+	);
+	register_theme_feature(
+		'custom-background',
+		array(
+			'description'  => __( 'Custom background if defined by the theme.' ),
+			'type'         => 'object',
+			'show_in_rest' => array(
+				'schema' => array(
+					'properties' => array(
+						'default-image'      => array(
+							'type'   => 'string',
+							'format' => 'uri',
+						),
+						'default-preset'     => array(
+							'type' => 'string',
+							'enum' => array(
+								'default',
+								'fill',
+								'fit',
+								'repeat',
+								'custom',
+							),
+						),
+						'default-position-x' => array(
+							'type' => 'string',
+							'enum' => array(
+								'left',
+								'center',
+								'right',
+							),
+						),
+						'default-position-y' => array(
+							'type' => 'string',
+							'enum' => array(
+								'left',
+								'center',
+								'right',
+							),
+						),
+						'default-size'       => array(
+							'type' => 'string',
+							'enum' => array(
+								'auto',
+								'contain',
+								'cover',
+							),
+						),
+						'default-repeat'     => array(
+							'type' => 'string',
+							'enum' => array(
+								'repeat-x',
+								'repeat-y',
+								'repeat',
+								'no-repeat',
+							),
+						),
+						'default-attachment' => array(
+							'type' => 'string',
+							'enum' => array(
+								'scroll',
+								'fixed',
+							),
+						),
+						'default-color'      => array(
+							'type' => 'string',
+						),
+					),
+				),
+			),
+		)
+	);
+	register_theme_feature(
+		'custom-header',
+		array(
+			'description'  => __( 'Custom header if defined by the theme.' ),
+			'type'         => 'object',
+			'show_in_rest' => array(
+				'schema' => array(
+					'properties' => array(
+						'default-image'      => array(
+							'type'   => 'string',
+							'format' => 'uri',
+						),
+						'random-default'     => array(
+							'type' => 'boolean',
+						),
+						'width'              => array(
+							'type' => 'integer',
+						),
+						'height'             => array(
+							'type' => 'integer',
+						),
+						'flex-height'        => array(
+							'type' => 'boolean',
+						),
+						'flex-width'         => array(
+							'type' => 'boolean',
+						),
+						'default-text-color' => array(
+							'type' => 'string',
+						),
+						'header-text'        => array(
+							'type' => 'boolean',
+						),
+						'uploads'            => array(
+							'type' => 'boolean',
+						),
+						'video'              => array(
+							'type' => 'boolean',
+						),
+					),
+				),
+			),
+		)
+	);
+	register_theme_feature(
+		'custom-logo',
+		array(
+			'type'         => 'object',
+			'description'  => __( 'Custom logo if defined by the theme.' ),
+			'show_in_rest' => array(
+				'schema' => array(
+					'properties' => array(
+						'width'                => array(
+							'type' => 'integer',
+						),
+						'height'               => array(
+							'type' => 'integer',
+						),
+						'flex-width'           => array(
+							'type' => 'boolean',
+						),
+						'flex-height'          => array(
+							'type' => 'boolean',
+						),
+						'header-text'          => array(
+							'type'  => 'array',
+							'items' => array(
+								'type' => 'string',
+							),
+						),
+						'unlink-homepage-logo' => array(
+							'type' => 'boolean',
+						),
+					),
+				),
+			),
+		)
+	);
+	register_theme_feature(
+		'customize-selective-refresh-widgets',
+		array(
+			'description'  => __( 'Whether the theme enables Selective Refresh for Widgets being managed with the Customizer.' ),
+			'show_in_rest' => true,
+		)
+	);
+	register_theme_feature(
+		'dark-editor-style',
+		array(
+			'description'  => __( 'Whether theme opts in to the dark editor style UI.' ),
+			'show_in_rest' => true,
+		)
+	);
+	register_theme_feature(
+		'disable-custom-colors',
+		array(
+			'description'  => __( 'Whether the theme disables custom colors.' ),
+			'show_in_rest' => true,
+		)
+	);
+	register_theme_feature(
+		'disable-custom-font-sizes',
+		array(
+			'description'  => __( 'Whether the theme disables custom font sizes.' ),
+			'show_in_rest' => true,
+		)
+	);
+	register_theme_feature(
+		'disable-custom-gradients',
+		array(
+			'description'  => __( 'Whether the theme disables custom gradients.' ),
+			'show_in_rest' => true,
+		)
+	);
+	register_theme_feature(
+		'disable-layout-styles',
+		array(
+			'description'  => __( 'Whether the theme disables generated layout styles.' ),
+			'show_in_rest' => true,
+		)
+	);
+	register_theme_feature(
+		'editor-color-palette',
+		array(
+			'type'         => 'array',
+			'description'  => __( 'Custom color palette if defined by the theme.' ),
+			'show_in_rest' => array(
+				'schema' => array(
+					'items' => array(
+						'type'       => 'object',
+						'properties' => array(
+							'name'  => array(
+								'type' => 'string',
+							),
+							'slug'  => array(
+								'type' => 'string',
+							),
+							'color' => array(
+								'type' => 'string',
+							),
+						),
+					),
+				),
+			),
+		)
+	);
+	register_theme_feature(
+		'editor-font-sizes',
+		array(
+			'type'         => 'array',
+			'description'  => __( 'Custom font sizes if defined by the theme.' ),
+			'show_in_rest' => array(
+				'schema' => array(
+					'items' => array(
+						'type'       => 'object',
+						'properties' => array(
+							'name' => array(
+								'type' => 'string',
+							),
+							'size' => array(
+								'type' => 'number',
+							),
+							'slug' => array(
+								'type' => 'string',
+							),
+						),
+					),
+				),
+			),
+		)
+	);
+	register_theme_feature(
+		'editor-gradient-presets',
+		array(
+			'type'         => 'array',
+			'description'  => __( 'Custom gradient presets if defined by the theme.' ),
+			'show_in_rest' => array(
+				'schema' => array(
+					'items' => array(
+						'type'       => 'object',
+						'properties' => array(
+							'name'     => array(
+								'type' => 'string',
+							),
+							'gradient' => array(
+								'type' => 'string',
+							),
+							'slug'     => array(
+								'type' => 'string',
+							),
+						),
+					),
+				),
+			),
+		)
+	);
+	register_theme_feature(
+		'editor-styles',
+		array(
+			'description'  => __( 'Whether theme opts in to the editor styles CSS wrapper.' ),
+			'show_in_rest' => true,
+		)
+	);
+	register_theme_feature(
+		'html5',
+		array(
+			'type'         => 'array',
+			'description'  => __( 'Allows use of HTML5 markup for search forms, comment forms, comment lists, gallery, and caption.' ),
+			'show_in_rest' => array(
+				'schema' => array(
+					'items' => array(
+						'type' => 'string',
+						'enum' => array(
+							'search-form',
+							'comment-form',
+							'comment-list',
+							'gallery',
+							'caption',
+							'script',
+							'style',
+						),
+					),
+				),
+			),
+		)
+	);
+	register_theme_feature(
+		'post-formats',
+		array(
+			'type'         => 'array',
+			'description'  => __( 'Post formats supported.' ),
+			'show_in_rest' => array(
+				'name'             => 'formats',
+				'schema'           => array(
+					'items'   => array(
+						'type' => 'string',
+						'enum' => get_post_format_slugs(),
+					),
+					'default' => array( 'standard' ),
+				),
+				'prepare_callback' => static function ( $formats ) {
+					$formats = is_array( $formats ) ? array_values( $formats[0] ) : array();
+					$formats = array_merge( array( 'standard' ), $formats );
+
+					return $formats;
+				},
+			),
+		)
+	);
+	register_theme_feature(
+		'post-thumbnails',
+		array(
+			'type'         => 'array',
+			'description'  => __( 'The post types that support thumbnails or true if all post types are supported.' ),
+			'show_in_rest' => array(
+				'type'   => array( 'boolean', 'array' ),
+				'schema' => array(
+					'items' => array(
+						'type' => 'string',
+					),
+				),
+			),
+		)
+	);
+	register_theme_feature(
+		'responsive-embeds',
+		array(
+			'description'  => __( 'Whether the theme supports responsive embedded content.' ),
+			'show_in_rest' => true,
+		)
+	);
+	register_theme_feature(
+		'title-tag',
+		array(
+			'description'  => __( 'Whether the theme can manage the document title tag.' ),
+			'show_in_rest' => true,
+		)
+	);
+	register_theme_feature(
+		'wp-block-styles',
+		array(
+			'description'  => __( 'Whether theme opts in to default WordPress block styles for viewing.' ),
+			'show_in_rest' => true,
+		)
+	);
+}
+
+/**
+ * Returns whether the active theme is a block-based theme or not.
+ *
+ * @since 5.9.0
+ *
+ * @return bool Whether the active theme is a block-based theme or not.
+ */
+function wp_is_block_theme() {
+	return wp_get_theme()->is_block_theme();
+}
+
+/**
+ * Given an element name, returns a class name.
+ *
+ * Alias of WP_Theme_JSON::get_element_class_name.
+ *
+ * @since 6.1.0
+ *
+ * @param string $element The name of the element.
+ *
+ * @return string The name of the class.
+ */
+function wp_theme_get_element_class_name( $element ) {
+	return WP_Theme_JSON::get_element_class_name( $element );
+}
+
+/**
+ * Adds default theme supports for block themes when the 'after_setup_theme' action fires.
+ *
+ * See {@see 'after_setup_theme'}.
+ *
+ * @since 5.9.0
+ * @access private
+ */
+function _add_default_theme_supports() {
+	if ( ! wp_is_block_theme() ) {
+		return;
+	}
+
+	add_theme_support( 'post-thumbnails' );
+	add_theme_support( 'responsive-embeds' );
+	add_theme_support( 'editor-styles' );
+	/*
+	 * Makes block themes support HTML5 by default for the comment block and search form
+	 * (which use default template functions) and `[caption]` and `[gallery]` shortcodes.
+	 * Other blocks contain their own HTML5 markup.
+	 */
+	add_theme_support( 'html5', array( 'comment-form', 'comment-list', 'search-form', 'gallery', 'caption', 'style', 'script' ) );
+	add_theme_support( 'automatic-feed-links' );
+
+	add_filter( 'should_load_separate_core_block_assets', '__return_true' );
+
+	/*
+	 * Remove the Customizer's Menus panel when block theme is active.
+	 */
+	add_filter(
+		'customize_panel_active',
+		static function ( $active, WP_Customize_Panel $panel ) {
+			if (
+				'nav_menus' === $panel->id &&
+				! current_theme_supports( 'menus' ) &&
+				! current_theme_supports( 'widgets' )
+			) {
+				$active = false;
+			}
+			return $active;
+		},
+		10,
+		2
+	);
+}