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, 1250 insertions, 0 deletions

diff --git a/wp-admin/includes/theme.php b/wp-admin/includes/theme.php
new file mode 100644
index 0000000..f822e57
--- /dev/null
+++ b/wp-admin/includes/theme.php
@@ -0,0 +1,1250 @@
+<?php
+/**
+ * WordPress Theme Administration API
+ *
+ * @package WordPress
+ * @subpackage Administration
+ */
+
+/**
+ * Removes a theme.
+ *
+ * @since 2.8.0
+ *
+ * @global WP_Filesystem_Base $wp_filesystem WordPress filesystem subclass.
+ *
+ * @param string $stylesheet Stylesheet of the theme to delete.
+ * @param string $redirect   Redirect to page when complete.
+ * @return bool|null|WP_Error True on success, false if `$stylesheet` is empty, WP_Error on failure.
+ *                            Null if filesystem credentials are required to proceed.
+ */
+function delete_theme( $stylesheet, $redirect = '' ) {
+	global $wp_filesystem;
+
+	if ( empty( $stylesheet ) ) {
+		return false;
+	}
+
+	if ( empty( $redirect ) ) {
+		$redirect = wp_nonce_url( 'themes.php?action=delete&stylesheet=' . urlencode( $stylesheet ), 'delete-theme_' . $stylesheet );
+	}
+
+	ob_start();
+	$credentials = request_filesystem_credentials( $redirect );
+	$data        = ob_get_clean();
+
+	if ( false === $credentials ) {
+		if ( ! empty( $data ) ) {
+			require_once ABSPATH . 'wp-admin/admin-header.php';
+			echo $data;
+			require_once ABSPATH . 'wp-admin/admin-footer.php';
+			exit;
+		}
+		return;
+	}
+
+	if ( ! WP_Filesystem( $credentials ) ) {
+		ob_start();
+		// Failed to connect. Error and request again.
+		request_filesystem_credentials( $redirect, '', true );
+		$data = ob_get_clean();
+
+		if ( ! empty( $data ) ) {
+			require_once ABSPATH . 'wp-admin/admin-header.php';
+			echo $data;
+			require_once ABSPATH . 'wp-admin/admin-footer.php';
+			exit;
+		}
+		return;
+	}
+
+	if ( ! is_object( $wp_filesystem ) ) {
+		return new WP_Error( 'fs_unavailable', __( 'Could not access filesystem.' ) );
+	}
+
+	if ( is_wp_error( $wp_filesystem->errors ) && $wp_filesystem->errors->has_errors() ) {
+		return new WP_Error( 'fs_error', __( 'Filesystem error.' ), $wp_filesystem->errors );
+	}
+
+	// Get the base plugin folder.
+	$themes_dir = $wp_filesystem->wp_themes_dir();
+	if ( empty( $themes_dir ) ) {
+		return new WP_Error( 'fs_no_themes_dir', __( 'Unable to locate WordPress theme directory.' ) );
+	}
+
+	/**
+	 * Fires immediately before a theme deletion attempt.
+	 *
+	 * @since 5.8.0
+	 *
+	 * @param string $stylesheet Stylesheet of the theme to delete.
+	 */
+	do_action( 'delete_theme', $stylesheet );
+
+	$theme = wp_get_theme( $stylesheet );
+
+	$themes_dir = trailingslashit( $themes_dir );
+	$theme_dir  = trailingslashit( $themes_dir . $stylesheet );
+	$deleted    = $wp_filesystem->delete( $theme_dir, true );
+
+	/**
+	 * Fires immediately after a theme deletion attempt.
+	 *
+	 * @since 5.8.0
+	 *
+	 * @param string $stylesheet Stylesheet of the theme to delete.
+	 * @param bool   $deleted    Whether the theme deletion was successful.
+	 */
+	do_action( 'deleted_theme', $stylesheet, $deleted );
+
+	if ( ! $deleted ) {
+		return new WP_Error(
+			'could_not_remove_theme',
+			/* translators: %s: Theme name. */
+			sprintf( __( 'Could not fully remove the theme %s.' ), $stylesheet )
+		);
+	}
+
+	$theme_translations = wp_get_installed_translations( 'themes' );
+
+	// Remove language files, silently.
+	if ( ! empty( $theme_translations[ $stylesheet ] ) ) {
+		$translations = $theme_translations[ $stylesheet ];
+
+		foreach ( $translations as $translation => $data ) {
+			$wp_filesystem->delete( WP_LANG_DIR . '/themes/' . $stylesheet . '-' . $translation . '.po' );
+			$wp_filesystem->delete( WP_LANG_DIR . '/themes/' . $stylesheet . '-' . $translation . '.mo' );
+
+			$json_translation_files = glob( WP_LANG_DIR . '/themes/' . $stylesheet . '-' . $translation . '-*.json' );
+			if ( $json_translation_files ) {
+				array_map( array( $wp_filesystem, 'delete' ), $json_translation_files );
+			}
+		}
+	}
+
+	// Remove the theme from allowed themes on the network.
+	if ( is_multisite() ) {
+		WP_Theme::network_disable_theme( $stylesheet );
+	}
+
+	// Clear theme caches.
+	$theme->cache_delete();
+
+	// Force refresh of theme update information.
+	delete_site_transient( 'update_themes' );
+
+	return true;
+}
+
+/**
+ * Gets the page templates available in this theme.
+ *
+ * @since 1.5.0
+ * @since 4.7.0 Added the `$post_type` parameter.
+ *
+ * @param WP_Post|null $post      Optional. The post being edited, provided for context.
+ * @param string       $post_type Optional. Post type to get the templates for. Default 'page'.
+ * @return string[] Array of template file names keyed by the template header name.
+ */
+function get_page_templates( $post = null, $post_type = 'page' ) {
+	return array_flip( wp_get_theme()->get_page_templates( $post, $post_type ) );
+}
+
+/**
+ * Tidies a filename for url display by the theme file editor.
+ *
+ * @since 2.9.0
+ * @access private
+ *
+ * @param string $fullpath Full path to the theme file
+ * @param string $containingfolder Path of the theme parent folder
+ * @return string
+ */
+function _get_template_edit_filename( $fullpath, $containingfolder ) {
+	return str_replace( dirname( $containingfolder, 2 ), '', $fullpath );
+}
+
+/**
+ * Check if there is an update for a theme available.
+ *
+ * Will display link, if there is an update available.
+ *
+ * @since 2.7.0
+ *
+ * @see get_theme_update_available()
+ *
+ * @param WP_Theme $theme Theme data object.
+ */
+function theme_update_available( $theme ) {
+	echo get_theme_update_available( $theme );
+}
+
+/**
+ * Retrieves the update link if there is a theme update available.
+ *
+ * Will return a link if there is an update available.
+ *
+ * @since 3.8.0
+ *
+ * @param WP_Theme $theme WP_Theme object.
+ * @return string|false HTML for the update link, or false if invalid info was passed.
+ */
+function get_theme_update_available( $theme ) {
+	static $themes_update = null;
+
+	if ( ! current_user_can( 'update_themes' ) ) {
+		return false;
+	}
+
+	if ( ! isset( $themes_update ) ) {
+		$themes_update = get_site_transient( 'update_themes' );
+	}
+
+	if ( ! ( $theme instanceof WP_Theme ) ) {
+		return false;
+	}
+
+	$stylesheet = $theme->get_stylesheet();
+
+	$html = '';
+
+	if ( isset( $themes_update->response[ $stylesheet ] ) ) {
+		$update      = $themes_update->response[ $stylesheet ];
+		$theme_name  = $theme->display( 'Name' );
+		$details_url = add_query_arg(
+			array(
+				'TB_iframe' => 'true',
+				'width'     => 1024,
+				'height'    => 800,
+			),
+			$update['url']
+		); // Theme browser inside WP? Replace this. Also, theme preview JS will override this on the available list.
+		$update_url  = wp_nonce_url( admin_url( 'update.php?action=upgrade-theme&amp;theme=' . urlencode( $stylesheet ) ), 'upgrade-theme_' . $stylesheet );
+
+		if ( ! is_multisite() ) {
+			if ( ! current_user_can( 'update_themes' ) ) {
+				$html = sprintf(
+					/* translators: 1: Theme name, 2: Theme details URL, 3: Additional link attributes, 4: Version number. */
+					'<p><strong>' . __( 'There is a new version of %1$s available. <a href="%2$s" %3$s>View version %4$s details</a>.' ) . '</strong></p>',
+					$theme_name,
+					esc_url( $details_url ),
+					sprintf(
+						'class="thickbox open-plugin-details-modal" aria-label="%s"',
+						/* translators: 1: Theme name, 2: Version number. */
+						esc_attr( sprintf( __( 'View %1$s version %2$s details' ), $theme_name, $update['new_version'] ) )
+					),
+					$update['new_version']
+				);
+			} elseif ( empty( $update['package'] ) ) {
+				$html = sprintf(
+					/* translators: 1: Theme name, 2: Theme details URL, 3: Additional link attributes, 4: Version number. */
+					'<p><strong>' . __( 'There is a new version of %1$s available. <a href="%2$s" %3$s>View version %4$s details</a>. <em>Automatic update is unavailable for this theme.</em>' ) . '</strong></p>',
+					$theme_name,
+					esc_url( $details_url ),
+					sprintf(
+						'class="thickbox open-plugin-details-modal" aria-label="%s"',
+						/* translators: 1: Theme name, 2: Version number. */
+						esc_attr( sprintf( __( 'View %1$s version %2$s details' ), $theme_name, $update['new_version'] ) )
+					),
+					$update['new_version']
+				);
+			} else {
+				$html = sprintf(
+					/* translators: 1: Theme name, 2: Theme details URL, 3: Additional link attributes, 4: Version number, 5: Update URL, 6: Additional link attributes. */
+					'<p><strong>' . __( 'There is a new version of %1$s available. <a href="%2$s" %3$s>View version %4$s details</a> or <a href="%5$s" %6$s>update now</a>.' ) . '</strong></p>',
+					$theme_name,
+					esc_url( $details_url ),
+					sprintf(
+						'class="thickbox open-plugin-details-modal" aria-label="%s"',
+						/* translators: 1: Theme name, 2: Version number. */
+						esc_attr( sprintf( __( 'View %1$s version %2$s details' ), $theme_name, $update['new_version'] ) )
+					),
+					$update['new_version'],
+					$update_url,
+					sprintf(
+						'aria-label="%s" id="update-theme" data-slug="%s"',
+						/* translators: %s: Theme name. */
+						esc_attr( sprintf( _x( 'Update %s now', 'theme' ), $theme_name ) ),
+						$stylesheet
+					)
+				);
+			}
+		}
+	}
+
+	return $html;
+}
+
+/**
+ * Retrieves list of WordPress theme features (aka theme tags).
+ *
+ * @since 3.1.0
+ * @since 3.2.0 Added 'Gray' color and 'Featured Image Header', 'Featured Images',
+ *              'Full Width Template', and 'Post Formats' features.
+ * @since 3.5.0 Added 'Flexible Header' feature.
+ * @since 3.8.0 Renamed 'Width' filter to 'Layout'.
+ * @since 3.8.0 Renamed 'Fixed Width' and 'Flexible Width' options
+ *              to 'Fixed Layout' and 'Fluid Layout'.
+ * @since 3.8.0 Added 'Accessibility Ready' feature and 'Responsive Layout' option.
+ * @since 3.9.0 Combined 'Layout' and 'Columns' filters.
+ * @since 4.6.0 Removed 'Colors' filter.
+ * @since 4.6.0 Added 'Grid Layout' option.
+ *              Removed 'Fixed Layout', 'Fluid Layout', and 'Responsive Layout' options.
+ * @since 4.6.0 Added 'Custom Logo' and 'Footer Widgets' features.
+ *              Removed 'Blavatar' feature.
+ * @since 4.6.0 Added 'Blog', 'E-Commerce', 'Education', 'Entertainment', 'Food & Drink',
+ *              'Holiday', 'News', 'Photography', and 'Portfolio' subjects.
+ *              Removed 'Photoblogging' and 'Seasonal' subjects.
+ * @since 4.9.0 Reordered the filters from 'Layout', 'Features', 'Subject'
+ *              to 'Subject', 'Features', 'Layout'.
+ * @since 4.9.0 Removed 'BuddyPress', 'Custom Menu', 'Flexible Header',
+ *              'Front Page Posting', 'Microformats', 'RTL Language Support',
+ *              'Threaded Comments', and 'Translation Ready' features.
+ * @since 5.5.0 Added 'Block Editor Patterns', 'Block Editor Styles',
+ *              and 'Full Site Editing' features.
+ * @since 5.5.0 Added 'Wide Blocks' layout option.
+ * @since 5.8.1 Added 'Template Editing' feature.
+ * @since 6.1.1 Replaced 'Full Site Editing' feature name with 'Site Editor'.
+ * @since 6.2.0 Added 'Style Variations' feature.
+ *
+ * @param bool $api Optional. Whether try to fetch tags from the WordPress.org API. Defaults to true.
+ * @return array Array of features keyed by category with translations keyed by slug.
+ */
+function get_theme_feature_list( $api = true ) {
+	// Hard-coded list is used if API is not accessible.
+	$features = array(
+
+		__( 'Subject' )  => array(
+			'blog'           => __( 'Blog' ),
+			'e-commerce'     => __( 'E-Commerce' ),
+			'education'      => __( 'Education' ),
+			'entertainment'  => __( 'Entertainment' ),
+			'food-and-drink' => __( 'Food & Drink' ),
+			'holiday'        => __( 'Holiday' ),
+			'news'           => __( 'News' ),
+			'photography'    => __( 'Photography' ),
+			'portfolio'      => __( 'Portfolio' ),
+		),
+
+		__( 'Features' ) => array(
+			'accessibility-ready'   => __( 'Accessibility Ready' ),
+			'block-patterns'        => __( 'Block Editor Patterns' ),
+			'block-styles'          => __( 'Block Editor Styles' ),
+			'custom-background'     => __( 'Custom Background' ),
+			'custom-colors'         => __( 'Custom Colors' ),
+			'custom-header'         => __( 'Custom Header' ),
+			'custom-logo'           => __( 'Custom Logo' ),
+			'editor-style'          => __( 'Editor Style' ),
+			'featured-image-header' => __( 'Featured Image Header' ),
+			'featured-images'       => __( 'Featured Images' ),
+			'footer-widgets'        => __( 'Footer Widgets' ),
+			'full-site-editing'     => __( 'Site Editor' ),
+			'full-width-template'   => __( 'Full Width Template' ),
+			'post-formats'          => __( 'Post Formats' ),
+			'sticky-post'           => __( 'Sticky Post' ),
+			'style-variations'      => __( 'Style Variations' ),
+			'template-editing'      => __( 'Template Editing' ),
+			'theme-options'         => __( 'Theme Options' ),
+		),
+
+		__( 'Layout' )   => array(
+			'grid-layout'   => __( 'Grid Layout' ),
+			'one-column'    => __( 'One Column' ),
+			'two-columns'   => __( 'Two Columns' ),
+			'three-columns' => __( 'Three Columns' ),
+			'four-columns'  => __( 'Four Columns' ),
+			'left-sidebar'  => __( 'Left Sidebar' ),
+			'right-sidebar' => __( 'Right Sidebar' ),
+			'wide-blocks'   => __( 'Wide Blocks' ),
+		),
+
+	);
+
+	if ( ! $api || ! current_user_can( 'install_themes' ) ) {
+		return $features;
+	}
+
+	$feature_list = get_site_transient( 'wporg_theme_feature_list' );
+	if ( ! $feature_list ) {
+		set_site_transient( 'wporg_theme_feature_list', array(), 3 * HOUR_IN_SECONDS );
+	}
+
+	if ( ! $feature_list ) {
+		$feature_list = themes_api( 'feature_list', array() );
+		if ( is_wp_error( $feature_list ) ) {
+			return $features;
+		}
+	}
+
+	if ( ! $feature_list ) {
+		return $features;
+	}
+
+	set_site_transient( 'wporg_theme_feature_list', $feature_list, 3 * HOUR_IN_SECONDS );
+
+	$category_translations = array(
+		'Layout'   => __( 'Layout' ),
+		'Features' => __( 'Features' ),
+		'Subject'  => __( 'Subject' ),
+	);
+
+	$wporg_features = array();
+
+	// Loop over the wp.org canonical list and apply translations.
+	foreach ( (array) $feature_list as $feature_category => $feature_items ) {
+		if ( isset( $category_translations[ $feature_category ] ) ) {
+			$feature_category = $category_translations[ $feature_category ];
+		}
+
+		$wporg_features[ $feature_category ] = array();
+
+		foreach ( $feature_items as $feature ) {
+			if ( isset( $features[ $feature_category ][ $feature ] ) ) {
+				$wporg_features[ $feature_category ][ $feature ] = $features[ $feature_category ][ $feature ];
+			} else {
+				$wporg_features[ $feature_category ][ $feature ] = $feature;
+			}
+		}
+	}
+
+	return $wporg_features;
+}
+
+/**
+ * Retrieves theme installer pages from the WordPress.org Themes API.
+ *
+ * It is possible for a theme to override the Themes API result with three
+ * filters. Assume this is for themes, which can extend on the Theme Info to
+ * offer more choices. This is very powerful and must be used with care, when
+ * overriding the filters.
+ *
+ * The first filter, {@see 'themes_api_args'}, is for the args and gives the action
+ * as the second parameter. The hook for {@see 'themes_api_args'} must ensure that
+ * an object is returned.
+ *
+ * The second filter, {@see 'themes_api'}, allows a plugin to override the WordPress.org
+ * Theme API entirely. If `$action` is 'query_themes', 'theme_information', or 'feature_list',
+ * an object MUST be passed. If `$action` is 'hot_tags', an array should be passed.
+ *
+ * Finally, the third filter, {@see 'themes_api_result'}, makes it possible to filter the
+ * response object or array, depending on the `$action` type.
+ *
+ * Supported arguments per action:
+ *
+ * | Argument Name      | 'query_themes' | 'theme_information' | 'hot_tags' | 'feature_list'   |
+ * | -------------------| :------------: | :-----------------: | :--------: | :--------------: |
+ * | `$slug`            | No             |  Yes                | No         | No               |
+ * | `$per_page`        | Yes            |  No                 | No         | No               |
+ * | `$page`            | Yes            |  No                 | No         | No               |
+ * | `$number`          | No             |  No                 | Yes        | No               |
+ * | `$search`          | Yes            |  No                 | No         | No               |
+ * | `$tag`             | Yes            |  No                 | No         | No               |
+ * | `$author`          | Yes            |  No                 | No         | No               |
+ * | `$user`            | Yes            |  No                 | No         | No               |
+ * | `$browse`          | Yes            |  No                 | No         | No               |
+ * | `$locale`          | Yes            |  Yes                | No         | No               |
+ * | `$fields`          | Yes            |  Yes                | No         | No               |
+ *
+ * @since 2.8.0
+ *
+ * @param string       $action API action to perform: 'query_themes', 'theme_information',
+ *                             'hot_tags' or 'feature_list'.
+ * @param array|object $args   {
+ *     Optional. Array or object of arguments to serialize for the Themes API. Default empty array.
+ *
+ *     @type string  $slug     The theme slug. Default empty.
+ *     @type int     $per_page Number of themes per page. Default 24.
+ *     @type int     $page     Number of current page. Default 1.
+ *     @type int     $number   Number of tags to be queried.
+ *     @type string  $search   A search term. Default empty.
+ *     @type string  $tag      Tag to filter themes. Default empty.
+ *     @type string  $author   Username of an author to filter themes. Default empty.
+ *     @type string  $user     Username to query for their favorites. Default empty.
+ *     @type string  $browse   Browse view: 'featured', 'popular', 'updated', 'favorites'.
+ *     @type string  $locale   Locale to provide context-sensitive results. Default is the value of get_locale().
+ *     @type array   $fields   {
+ *         Array of fields which should or should not be returned.
+ *
+ *         @type bool $description        Whether to return the theme full description. Default false.
+ *         @type bool $sections           Whether to return the theme readme sections: description, installation,
+ *                                        FAQ, screenshots, other notes, and changelog. Default false.
+ *         @type bool $rating             Whether to return the rating in percent and total number of ratings.
+ *                                        Default false.
+ *         @type bool $ratings            Whether to return the number of rating for each star (1-5). Default false.
+ *         @type bool $downloaded         Whether to return the download count. Default false.
+ *         @type bool $downloadlink       Whether to return the download link for the package. Default false.
+ *         @type bool $last_updated       Whether to return the date of the last update. Default false.
+ *         @type bool $tags               Whether to return the assigned tags. Default false.
+ *         @type bool $homepage           Whether to return the theme homepage link. Default false.
+ *         @type bool $screenshots        Whether to return the screenshots. Default false.
+ *         @type int  $screenshot_count   Number of screenshots to return. Default 1.
+ *         @type bool $screenshot_url     Whether to return the URL of the first screenshot. Default false.
+ *         @type bool $photon_screenshots Whether to return the screenshots via Photon. Default false.
+ *         @type bool $template           Whether to return the slug of the parent theme. Default false.
+ *         @type bool $parent             Whether to return the slug, name and homepage of the parent theme. Default false.
+ *         @type bool $versions           Whether to return the list of all available versions. Default false.
+ *         @type bool $theme_url          Whether to return theme's URL. Default false.
+ *         @type bool $extended_author    Whether to return nicename or nicename and display name. Default false.
+ *     }
+ * }
+ * @return object|array|WP_Error Response object or array on success, WP_Error on failure. See the
+ *         {@link https://developer.wordpress.org/reference/functions/themes_api/ function reference article}
+ *         for more information on the make-up of possible return objects depending on the value of `$action`.
+ */
+function themes_api( $action, $args = array() ) {
+	// Include an unmodified $wp_version.
+	require ABSPATH . WPINC . '/version.php';
+
+	if ( is_array( $args ) ) {
+		$args = (object) $args;
+	}
+
+	if ( 'query_themes' === $action ) {
+		if ( ! isset( $args->per_page ) ) {
+			$args->per_page = 24;
+		}
+	}
+
+	if ( ! isset( $args->locale ) ) {
+		$args->locale = get_user_locale();
+	}
+
+	if ( ! isset( $args->wp_version ) ) {
+		$args->wp_version = substr( $wp_version, 0, 3 ); // x.y
+	}
+
+	/**
+	 * Filters arguments used to query for installer pages from the WordPress.org Themes API.
+	 *
+	 * Important: An object MUST be returned to this filter.
+	 *
+	 * @since 2.8.0
+	 *
+	 * @param object $args   Arguments used to query for installer pages from the WordPress.org Themes API.
+	 * @param string $action Requested action. Likely values are 'theme_information',
+	 *                       'feature_list', or 'query_themes'.
+	 */
+	$args = apply_filters( 'themes_api_args', $args, $action );
+
+	/**
+	 * Filters whether to override the WordPress.org Themes API.
+	 *
+	 * Returning a non-false value will effectively short-circuit the WordPress.org API request.
+	 *
+	 * If `$action` is 'query_themes', 'theme_information', or 'feature_list', an object MUST
+	 * be passed. If `$action` is 'hot_tags', an array should be passed.
+	 *
+	 * @since 2.8.0
+	 *
+	 * @param false|object|array $override Whether to override the WordPress.org Themes API. Default false.
+	 * @param string             $action   Requested action. Likely values are 'theme_information',
+	 *                                    'feature_list', or 'query_themes'.
+	 * @param object             $args     Arguments used to query for installer pages from the Themes API.
+	 */
+	$res = apply_filters( 'themes_api', false, $action, $args );
+
+	if ( ! $res ) {
+		$url = 'http://api.wordpress.org/themes/info/1.2/';
+		$url = add_query_arg(
+			array(
+				'action'  => $action,
+				'request' => $args,
+			),
+			$url
+		);
+
+		$http_url = $url;
+		$ssl      = wp_http_supports( array( 'ssl' ) );
+		if ( $ssl ) {
+			$url = set_url_scheme( $url, 'https' );
+		}
+
+		$http_args = array(
+			'timeout'    => 15,
+			'user-agent' => 'WordPress/' . $wp_version . '; ' . home_url( '/' ),
+		);
+		$request   = wp_remote_get( $url, $http_args );
+
+		if ( $ssl && is_wp_error( $request ) ) {
+			if ( ! wp_doing_ajax() ) {
+				trigger_error(
+					sprintf(
+						/* translators: %s: Support forums URL. */
+						__( 'An unexpected error occurred. Something may be wrong with WordPress.org or this server&#8217;s configuration. If you continue to have problems, please try the <a href="%s">support forums</a>.' ),
+						__( 'https://wordpress.org/support/forums/' )
+					) . ' ' . __( '(WordPress could not establish a secure connection to WordPress.org. Please contact your server administrator.)' ),
+					headers_sent() || WP_DEBUG ? E_USER_WARNING : E_USER_NOTICE
+				);
+			}
+			$request = wp_remote_get( $http_url, $http_args );
+		}
+
+		if ( is_wp_error( $request ) ) {
+			$res = new WP_Error(
+				'themes_api_failed',
+				sprintf(
+					/* translators: %s: Support forums URL. */
+					__( 'An unexpected error occurred. Something may be wrong with WordPress.org or this server&#8217;s configuration. If you continue to have problems, please try the <a href="%s">support forums</a>.' ),
+					__( 'https://wordpress.org/support/forums/' )
+				),
+				$request->get_error_message()
+			);
+		} else {
+			$res = json_decode( wp_remote_retrieve_body( $request ), true );
+			if ( is_array( $res ) ) {
+				// Object casting is required in order to match the info/1.0 format.
+				$res = (object) $res;
+			} elseif ( null === $res ) {
+				$res = new WP_Error(
+					'themes_api_failed',
+					sprintf(
+						/* translators: %s: Support forums URL. */
+						__( 'An unexpected error occurred. Something may be wrong with WordPress.org or this server&#8217;s configuration. If you continue to have problems, please try the <a href="%s">support forums</a>.' ),
+						__( 'https://wordpress.org/support/forums/' )
+					),
+					wp_remote_retrieve_body( $request )
+				);
+			}
+
+			if ( isset( $res->error ) ) {
+				$res = new WP_Error( 'themes_api_failed', $res->error );
+			}
+		}
+
+		if ( ! is_wp_error( $res ) ) {
+			// Back-compat for info/1.2 API, upgrade the theme objects in query_themes to objects.
+			if ( 'query_themes' === $action ) {
+				foreach ( $res->themes as $i => $theme ) {
+					$res->themes[ $i ] = (object) $theme;
+				}
+			}
+
+			// Back-compat for info/1.2 API, downgrade the feature_list result back to an array.
+			if ( 'feature_list' === $action ) {
+				$res = (array) $res;
+			}
+		}
+	}
+
+	/**
+	 * Filters the returned WordPress.org Themes API response.
+	 *
+	 * @since 2.8.0
+	 *
+	 * @param array|stdClass|WP_Error $res    WordPress.org Themes API response.
+	 * @param string                  $action Requested action. Likely values are 'theme_information',
+	 *                                        'feature_list', or 'query_themes'.
+	 * @param stdClass                $args   Arguments used to query for installer pages from the WordPress.org Themes API.
+	 */
+	return apply_filters( 'themes_api_result', $res, $action, $args );
+}
+
+/**
+ * Prepares themes for JavaScript.
+ *
+ * @since 3.8.0
+ *
+ * @param WP_Theme[] $themes Optional. Array of theme objects to prepare.
+ *                           Defaults to all allowed themes.
+ *
+ * @return array An associative array of theme data, sorted by name.
+ */
+function wp_prepare_themes_for_js( $themes = null ) {
+	$current_theme = get_stylesheet();
+
+	/**
+	 * Filters theme data before it is prepared for JavaScript.
+	 *
+	 * Passing a non-empty array will result in wp_prepare_themes_for_js() returning
+	 * early with that value instead.
+	 *
+	 * @since 4.2.0
+	 *
+	 * @param array           $prepared_themes An associative array of theme data. Default empty array.
+	 * @param WP_Theme[]|null $themes          An array of theme objects to prepare, if any.
+	 * @param string          $current_theme   The active theme slug.
+	 */
+	$prepared_themes = (array) apply_filters( 'pre_prepare_themes_for_js', array(), $themes, $current_theme );
+
+	if ( ! empty( $prepared_themes ) ) {
+		return $prepared_themes;
+	}
+
+	// Make sure the active theme is listed first.
+	$prepared_themes[ $current_theme ] = array();
+
+	if ( null === $themes ) {
+		$themes = wp_get_themes( array( 'allowed' => true ) );
+		if ( ! isset( $themes[ $current_theme ] ) ) {
+			$themes[ $current_theme ] = wp_get_theme();
+		}
+	}
+
+	$updates    = array();
+	$no_updates = array();
+	if ( ! is_multisite() && current_user_can( 'update_themes' ) ) {
+		$updates_transient = get_site_transient( 'update_themes' );
+		if ( isset( $updates_transient->response ) ) {
+			$updates = $updates_transient->response;
+		}
+		if ( isset( $updates_transient->no_update ) ) {
+			$no_updates = $updates_transient->no_update;
+		}
+	}
+
+	WP_Theme::sort_by_name( $themes );
+
+	$parents = array();
+
+	$auto_updates = (array) get_site_option( 'auto_update_themes', array() );
+
+	foreach ( $themes as $theme ) {
+		$slug         = $theme->get_stylesheet();
+		$encoded_slug = urlencode( $slug );
+
+		$parent = false;
+		if ( $theme->parent() ) {
+			$parent           = $theme->parent();
+			$parents[ $slug ] = $parent->get_stylesheet();
+			$parent           = $parent->display( 'Name' );
+		}
+
+		$customize_action = null;
+
+		$can_edit_theme_options = current_user_can( 'edit_theme_options' );
+		$can_customize          = current_user_can( 'customize' );
+		$is_block_theme         = $theme->is_block_theme();
+
+		if ( $is_block_theme && $can_edit_theme_options ) {
+			$customize_action = admin_url( 'site-editor.php' );
+			if ( $current_theme !== $slug ) {
+				$customize_action = add_query_arg( 'wp_theme_preview', $slug, $customize_action );
+			}
+		} elseif ( ! $is_block_theme && $can_customize && $can_edit_theme_options ) {
+			$customize_action = wp_customize_url( $slug );
+		}
+		if ( null !== $customize_action ) {
+			$customize_action = add_query_arg(
+				array(
+					'return' => urlencode( sanitize_url( remove_query_arg( wp_removable_query_args(), wp_unslash( $_SERVER['REQUEST_URI'] ) ) ) ),
+				),
+				$customize_action
+			);
+			$customize_action = esc_url( $customize_action );
+		}
+
+		$update_requires_wp  = isset( $updates[ $slug ]['requires'] ) ? $updates[ $slug ]['requires'] : null;
+		$update_requires_php = isset( $updates[ $slug ]['requires_php'] ) ? $updates[ $slug ]['requires_php'] : null;
+
+		$auto_update        = in_array( $slug, $auto_updates, true );
+		$auto_update_action = $auto_update ? 'disable-auto-update' : 'enable-auto-update';
+
+		if ( isset( $updates[ $slug ] ) ) {
+			$auto_update_supported      = true;
+			$auto_update_filter_payload = (object) $updates[ $slug ];
+		} elseif ( isset( $no_updates[ $slug ] ) ) {
+			$auto_update_supported      = true;
+			$auto_update_filter_payload = (object) $no_updates[ $slug ];
+		} else {
+			$auto_update_supported = false;
+			/*
+			 * Create the expected payload for the auto_update_theme filter, this is the same data
+			 * as contained within $updates or $no_updates but used when the Theme is not known.
+			 */
+			$auto_update_filter_payload = (object) array(
+				'theme'        => $slug,
+				'new_version'  => $theme->get( 'Version' ),
+				'url'          => '',
+				'package'      => '',
+				'requires'     => $theme->get( 'RequiresWP' ),
+				'requires_php' => $theme->get( 'RequiresPHP' ),
+			);
+		}
+
+		$auto_update_forced = wp_is_auto_update_forced_for_item( 'theme', null, $auto_update_filter_payload );
+
+		$prepared_themes[ $slug ] = array(
+			'id'             => $slug,
+			'name'           => $theme->display( 'Name' ),
+			'screenshot'     => array( $theme->get_screenshot() ), // @todo Multiple screenshots.
+			'description'    => $theme->display( 'Description' ),
+			'author'         => $theme->display( 'Author', false, true ),
+			'authorAndUri'   => $theme->display( 'Author' ),
+			'tags'           => $theme->display( 'Tags' ),
+			'version'        => $theme->get( 'Version' ),
+			'compatibleWP'   => is_wp_version_compatible( $theme->get( 'RequiresWP' ) ),
+			'compatiblePHP'  => is_php_version_compatible( $theme->get( 'RequiresPHP' ) ),
+			'updateResponse' => array(
+				'compatibleWP'  => is_wp_version_compatible( $update_requires_wp ),
+				'compatiblePHP' => is_php_version_compatible( $update_requires_php ),
+			),
+			'parent'         => $parent,
+			'active'         => $slug === $current_theme,
+			'hasUpdate'      => isset( $updates[ $slug ] ),
+			'hasPackage'     => isset( $updates[ $slug ] ) && ! empty( $updates[ $slug ]['package'] ),
+			'update'         => get_theme_update_available( $theme ),
+			'autoupdate'     => array(
+				'enabled'   => $auto_update || $auto_update_forced,
+				'supported' => $auto_update_supported,
+				'forced'    => $auto_update_forced,
+			),
+			'actions'        => array(
+				'activate'   => current_user_can( 'switch_themes' ) ? wp_nonce_url( admin_url( 'themes.php?action=activate&amp;stylesheet=' . $encoded_slug ), 'switch-theme_' . $slug ) : null,
+				'customize'  => $customize_action,
+				'delete'     => ( ! is_multisite() && current_user_can( 'delete_themes' ) ) ? wp_nonce_url( admin_url( 'themes.php?action=delete&amp;stylesheet=' . $encoded_slug ), 'delete-theme_' . $slug ) : null,
+				'autoupdate' => wp_is_auto_update_enabled_for_type( 'theme' ) && ! is_multisite() && current_user_can( 'update_themes' )
+					? wp_nonce_url( admin_url( 'themes.php?action=' . $auto_update_action . '&amp;stylesheet=' . $encoded_slug ), 'updates' )
+					: null,
+			),
+			'blockTheme'     => $theme->is_block_theme(),
+		);
+	}
+
+	// Remove 'delete' action if theme has an active child.
+	if ( ! empty( $parents ) && array_key_exists( $current_theme, $parents ) ) {
+		unset( $prepared_themes[ $parents[ $current_theme ] ]['actions']['delete'] );
+	}
+
+	/**
+	 * Filters the themes prepared for JavaScript, for themes.php.
+	 *
+	 * Could be useful for changing the order, which is by name by default.
+	 *
+	 * @since 3.8.0
+	 *
+	 * @param array $prepared_themes Array of theme data.
+	 */
+	$prepared_themes = apply_filters( 'wp_prepare_themes_for_js', $prepared_themes );
+	$prepared_themes = array_values( $prepared_themes );
+	return array_filter( $prepared_themes );
+}
+
+/**
+ * Prints JS templates for the theme-browsing UI in the Customizer.
+ *
+ * @since 4.2.0
+ */
+function customize_themes_print_templates() {
+	?>
+	<script type="text/html" id="tmpl-customize-themes-details-view">
+		<div class="theme-backdrop"></div>
+		<div class="theme-wrap wp-clearfix" role="document">
+			<div class="theme-header">
+				<button type="button" class="left dashicons dashicons-no"><span class="screen-reader-text">
+					<?php
+					/* translators: Hidden accessibility text. */
+					_e( 'Show previous theme' );
+					?>
+				</span></button>
+				<button type="button" class="right dashicons dashicons-no"><span class="screen-reader-text">
+					<?php
+					/* translators: Hidden accessibility text. */
+					_e( 'Show next theme' );
+					?>
+				</span></button>
+				<button type="button" class="close dashicons dashicons-no"><span class="screen-reader-text">
+					<?php
+					/* translators: Hidden accessibility text. */
+					_e( 'Close details dialog' );
+					?>
+				</span></button>
+			</div>
+			<div class="theme-about wp-clearfix">
+				<div class="theme-screenshots">
+				<# if ( data.screenshot && data.screenshot[0] ) { #>
+					<div class="screenshot"><img src="{{ data.screenshot[0] }}?ver={{ data.version }}" alt="" /></div>
+				<# } else { #>
+					<div class="screenshot blank"></div>
+				<# } #>
+				</div>
+
+				<div class="theme-info">
+					<# if ( data.active ) { #>
+						<span class="current-label"><?php _e( 'Active Theme' ); ?></span>
+					<# } #>
+					<h2 class="theme-name">{{{ data.name }}}<span class="theme-version">
+						<?php
+						/* translators: %s: Theme version. */
+						printf( __( 'Version: %s' ), '{{ data.version }}' );
+						?>
+					</span></h2>
+					<h3 class="theme-author">
+						<?php
+						/* translators: %s: Theme author link. */
+						printf( __( 'By %s' ), '{{{ data.authorAndUri }}}' );
+						?>
+					</h3>
+
+					<# if ( data.stars && 0 != data.num_ratings ) { #>
+						<div class="theme-rating">
+							{{{ data.stars }}}
+							<a class="num-ratings" target="_blank" href="{{ data.reviews_url }}">
+								<?php
+								printf(
+									'%1$s <span class="screen-reader-text">%2$s</span>',
+									/* translators: %s: Number of ratings. */
+									sprintf( __( '(%s ratings)' ), '{{ data.num_ratings }}' ),
+									/* translators: Hidden accessibility text. */
+									__( '(opens in a new tab)' )
+								);
+								?>
+							</a>
+						</div>
+					<# } #>
+
+					<# if ( data.hasUpdate ) { #>
+						<# if ( data.updateResponse.compatibleWP && data.updateResponse.compatiblePHP ) { #>
+							<div class="notice notice-warning notice-alt notice-large" data-slug="{{ data.id }}">
+								<h3 class="notice-title"><?php _e( 'Update Available' ); ?></h3>
+								{{{ data.update }}}
+							</div>
+						<# } else { #>
+							<div class="notice notice-error notice-alt notice-large" data-slug="{{ data.id }}">
+								<h3 class="notice-title"><?php _e( 'Update Incompatible' ); ?></h3>
+								<p>
+									<# if ( ! data.updateResponse.compatibleWP && ! data.updateResponse.compatiblePHP ) { #>
+										<?php
+										printf(
+											/* translators: %s: Theme name. */
+											__( 'There is a new version of %s available, but it does not work with your versions of WordPress and PHP.' ),
+											'{{{ data.name }}}'
+										);
+										if ( current_user_can( 'update_core' ) && current_user_can( 'update_php' ) ) {
+											printf(
+												/* translators: 1: URL to WordPress Updates screen, 2: URL to Update PHP page. */
+												' ' . __( '<a href="%1$s">Please update WordPress</a>, and then <a href="%2$s">learn more about updating PHP</a>.' ),
+												self_admin_url( 'update-core.php' ),
+												esc_url( wp_get_update_php_url() )
+											);
+											wp_update_php_annotation( '</p><p><em>', '</em>' );
+										} elseif ( current_user_can( 'update_core' ) ) {
+											printf(
+												/* translators: %s: URL to WordPress Updates screen. */
+												' ' . __( '<a href="%s">Please update WordPress</a>.' ),
+												self_admin_url( 'update-core.php' )
+											);
+										} elseif ( current_user_can( 'update_php' ) ) {
+											printf(
+												/* translators: %s: URL to Update PHP page. */
+												' ' . __( '<a href="%s">Learn more about updating PHP</a>.' ),
+												esc_url( wp_get_update_php_url() )
+											);
+											wp_update_php_annotation( '</p><p><em>', '</em>' );
+										}
+										?>
+									<# } else if ( ! data.updateResponse.compatibleWP ) { #>
+										<?php
+										printf(
+											/* translators: %s: Theme name. */
+											__( 'There is a new version of %s available, but it does not work with your version of WordPress.' ),
+											'{{{ data.name }}}'
+										);
+										if ( current_user_can( 'update_core' ) ) {
+											printf(
+												/* translators: %s: URL to WordPress Updates screen. */
+												' ' . __( '<a href="%s">Please update WordPress</a>.' ),
+												self_admin_url( 'update-core.php' )
+											);
+										}
+										?>
+									<# } else if ( ! data.updateResponse.compatiblePHP ) { #>
+										<?php
+										printf(
+											/* translators: %s: Theme name. */
+											__( 'There is a new version of %s available, but it does not work with your version of PHP.' ),
+											'{{{ data.name }}}'
+										);
+										if ( current_user_can( 'update_php' ) ) {
+											printf(
+												/* translators: %s: URL to Update PHP page. */
+												' ' . __( '<a href="%s">Learn more about updating PHP</a>.' ),
+												esc_url( wp_get_update_php_url() )
+											);
+											wp_update_php_annotation( '</p><p><em>', '</em>' );
+										}
+										?>
+									<# } #>
+								</p>
+							</div>
+						<# } #>
+					<# } #>
+
+					<# if ( data.parent ) { #>
+						<p class="parent-theme">
+							<?php
+							printf(
+								/* translators: %s: Theme name. */
+								__( 'This is a child theme of %s.' ),
+								'<strong>{{{ data.parent }}}</strong>'
+							);
+							?>
+						</p>
+					<# } #>
+
+					<# if ( ! data.compatibleWP || ! data.compatiblePHP ) { #>
+						<div class="notice notice-error notice-alt notice-large"><p>
+							<# if ( ! data.compatibleWP && ! data.compatiblePHP ) { #>
+								<?php
+								_e( 'This theme does not work with your versions of WordPress and PHP.' );
+								if ( current_user_can( 'update_core' ) && current_user_can( 'update_php' ) ) {
+									printf(
+										/* translators: 1: URL to WordPress Updates screen, 2: URL to Update PHP page. */
+										' ' . __( '<a href="%1$s">Please update WordPress</a>, and then <a href="%2$s">learn more about updating PHP</a>.' ),
+										self_admin_url( 'update-core.php' ),
+										esc_url( wp_get_update_php_url() )
+									);
+									wp_update_php_annotation( '</p><p><em>', '</em>' );
+								} elseif ( current_user_can( 'update_core' ) ) {
+									printf(
+										/* translators: %s: URL to WordPress Updates screen. */
+										' ' . __( '<a href="%s">Please update WordPress</a>.' ),
+										self_admin_url( 'update-core.php' )
+									);
+								} elseif ( current_user_can( 'update_php' ) ) {
+									printf(
+										/* translators: %s: URL to Update PHP page. */
+										' ' . __( '<a href="%s">Learn more about updating PHP</a>.' ),
+										esc_url( wp_get_update_php_url() )
+									);
+									wp_update_php_annotation( '</p><p><em>', '</em>' );
+								}
+								?>
+							<# } else if ( ! data.compatibleWP ) { #>
+								<?php
+								_e( 'This theme does not work with your version of WordPress.' );
+								if ( current_user_can( 'update_core' ) ) {
+									printf(
+										/* translators: %s: URL to WordPress Updates screen. */
+										' ' . __( '<a href="%s">Please update WordPress</a>.' ),
+										self_admin_url( 'update-core.php' )
+									);
+								}
+								?>
+							<# } else if ( ! data.compatiblePHP ) { #>
+								<?php
+								_e( 'This theme does not work with your version of PHP.' );
+								if ( current_user_can( 'update_php' ) ) {
+									printf(
+										/* translators: %s: URL to Update PHP page. */
+										' ' . __( '<a href="%s">Learn more about updating PHP</a>.' ),
+										esc_url( wp_get_update_php_url() )
+									);
+									wp_update_php_annotation( '</p><p><em>', '</em>' );
+								}
+								?>
+							<# } #>
+						</p></div>
+					<# } else if ( ! data.active && data.blockTheme ) { #>
+						<div class="notice notice-error notice-alt notice-large"><p>
+						<?php
+							_e( 'This theme doesn\'t support Customizer.' );
+						?>
+						<# if ( data.actions.activate ) { #>
+							<?php
+							printf(
+								/* translators: %s: URL to the themes page (also it activates the theme). */
+								' ' . __( 'However, you can still <a href="%s">activate this theme</a>, and use the Site Editor to customize it.' ),
+								'{{{ data.actions.activate }}}'
+							);
+							?>
+						<# } #>
+						</p></div>
+					<# } #>
+
+					<p class="theme-description">{{{ data.description }}}</p>
+
+					<# if ( data.tags ) { #>
+						<p class="theme-tags"><span><?php _e( 'Tags:' ); ?></span> {{{ data.tags }}}</p>
+					<# } #>
+				</div>
+			</div>
+
+			<div class="theme-actions">
+				<# if ( data.active ) { #>
+					<button type="button" class="button button-primary customize-theme"><?php _e( 'Customize' ); ?></button>
+				<# } else if ( 'installed' === data.type ) { #>
+					<div class="theme-inactive-actions">
+					<# if ( data.blockTheme ) { #>
+						<?php
+							/* translators: %s: Theme name. */
+							$aria_label = sprintf( _x( 'Activate %s', 'theme' ), '{{ data.name }}' );
+						?>
+						<# if ( data.compatibleWP && data.compatiblePHP && data.actions.activate ) { #>
+							<a href="{{{ data.actions.activate }}}" class="button button-primary activate" aria-label="<?php echo esc_attr( $aria_label ); ?>"><?php _e( 'Activate' ); ?></a>
+						<# } #>
+					<# } else { #>
+						<# if ( data.compatibleWP && data.compatiblePHP ) { #>
+							<button type="button" class="button button-primary preview-theme" data-slug="{{ data.id }}"><?php _e( 'Live Preview' ); ?></button>
+						<# } else { #>
+							<button class="button button-primary disabled"><?php _e( 'Live Preview' ); ?></button>
+						<# } #>
+					<# } #>
+					</div>
+					<?php if ( current_user_can( 'delete_themes' ) ) { ?>
+						<# if ( data.actions && data.actions['delete'] ) { #>
+							<a href="{{{ data.actions['delete'] }}}" data-slug="{{ data.id }}" class="button button-secondary delete-theme"><?php _e( 'Delete' ); ?></a>
+						<# } #>
+					<?php } ?>
+				<# } else { #>
+					<# if ( data.compatibleWP && data.compatiblePHP ) { #>
+						<button type="button" class="button theme-install" data-slug="{{ data.id }}"><?php _e( 'Install' ); ?></button>
+						<button type="button" class="button button-primary theme-install preview" data-slug="{{ data.id }}"><?php _e( 'Install &amp; Preview' ); ?></button>
+					<# } else { #>
+						<button type="button" class="button disabled"><?php _ex( 'Cannot Install', 'theme' ); ?></button>
+						<button type="button" class="button button-primary disabled"><?php _e( 'Install &amp; Preview' ); ?></button>
+					<# } #>
+				<# } #>
+			</div>
+		</div>
+	</script>
+	<?php
+}
+
+/**
+ * Determines whether a theme is technically active but was paused while
+ * loading.
+ *
+ * For more information on this and similar theme functions, check out
+ * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/
+ * Conditional Tags} article in the Theme Developer Handbook.
+ *
+ * @since 5.2.0
+ *
+ * @param string $theme Path to the theme directory relative to the themes directory.
+ * @return bool True, if in the list of paused themes. False, not in the list.
+ */
+function is_theme_paused( $theme ) {
+	if ( ! isset( $GLOBALS['_paused_themes'] ) ) {
+		return false;
+	}
+
+	if ( get_stylesheet() !== $theme && get_template() !== $theme ) {
+		return false;
+	}
+
+	return array_key_exists( $theme, $GLOBALS['_paused_themes'] );
+}
+
+/**
+ * Gets the error that was recorded for a paused theme.
+ *
+ * @since 5.2.0
+ *
+ * @param string $theme Path to the theme directory relative to the themes
+ *                      directory.
+ * @return array|false Array of error information as it was returned by
+ *                     `error_get_last()`, or false if none was recorded.
+ */
+function wp_get_theme_error( $theme ) {
+	if ( ! isset( $GLOBALS['_paused_themes'] ) ) {
+		return false;
+	}
+
+	if ( ! array_key_exists( $theme, $GLOBALS['_paused_themes'] ) ) {
+		return false;
+	}
+
+	return $GLOBALS['_paused_themes'][ $theme ];
+}
+
+/**
+ * Tries to resume a single theme.
+ *
+ * If a redirect was provided and a functions.php file was found, we first ensure that
+ * functions.php file does not throw fatal errors anymore.
+ *
+ * The way it works is by setting the redirection to the error before trying to
+ * include the file. If the theme fails, then the redirection will not be overwritten
+ * with the success message and the theme will not be resumed.
+ *
+ * @since 5.2.0
+ *
+ * @param string $theme    Single theme to resume.
+ * @param string $redirect Optional. URL to redirect to. Default empty string.
+ * @return bool|WP_Error True on success, false if `$theme` was not paused,
+ *                       `WP_Error` on failure.
+ */
+function resume_theme( $theme, $redirect = '' ) {
+	list( $extension ) = explode( '/', $theme );
+
+	/*
+	 * We'll override this later if the theme could be resumed without
+	 * creating a fatal error.
+	 */
+	if ( ! empty( $redirect ) ) {
+		$stylesheet_path = get_stylesheet_directory();
+		$template_path   = get_template_directory();
+
+		$functions_path = '';
+		if ( str_contains( $stylesheet_path, $extension ) ) {
+			$functions_path = $stylesheet_path . '/functions.php';
+		} elseif ( str_contains( $template_path, $extension ) ) {
+			$functions_path = $template_path . '/functions.php';
+		}
+
+		if ( ! empty( $functions_path ) ) {
+			wp_redirect(
+				add_query_arg(
+					'_error_nonce',
+					wp_create_nonce( 'theme-resume-error_' . $theme ),
+					$redirect
+				)
+			);
+
+			// Load the theme's functions.php to test whether it throws a fatal error.
+			ob_start();
+			if ( ! defined( 'WP_SANDBOX_SCRAPING' ) ) {
+				define( 'WP_SANDBOX_SCRAPING', true );
+			}
+			include $functions_path;
+			ob_clean();
+		}
+	}
+
+	$result = wp_paused_themes()->delete( $extension );
+
+	if ( ! $result ) {
+		return new WP_Error(
+			'could_not_resume_theme',
+			__( 'Could not resume the theme.' )
+		);
+	}
+
+	return true;
+}
+
+/**
+ * Renders an admin notice in case some themes have been paused due to errors.
+ *
+ * @since 5.2.0
+ *
+ * @global string $pagenow The filename of the current screen.
+ */
+function paused_themes_notice() {
+	if ( 'themes.php' === $GLOBALS['pagenow'] ) {
+		return;
+	}
+
+	if ( ! current_user_can( 'resume_themes' ) ) {
+		return;
+	}
+
+	if ( ! isset( $GLOBALS['_paused_themes'] ) || empty( $GLOBALS['_paused_themes'] ) ) {
+		return;
+	}
+
+	$message = sprintf(
+		'<p><strong>%s</strong><br>%s</p><p><a href="%s">%s</a></p>',
+		__( 'One or more themes failed to load properly.' ),
+		__( 'You can find more details and make changes on the Themes screen.' ),
+		esc_url( admin_url( 'themes.php' ) ),
+		__( 'Go to the Themes screen' )
+	);
+	wp_admin_notice(
+		$message,
+		array(
+			'type'           => 'error',
+			'paragraph_wrap' => false,
+		)
+	);
+}