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, 2918 insertions, 0 deletions

diff --git a/wp-includes/option.php b/wp-includes/option.php
new file mode 100644
index 0000000..13f5d49
--- /dev/null
+++ b/wp-includes/option.php
@@ -0,0 +1,2918 @@
+<?php
+/**
+ * Option API
+ *
+ * @package WordPress
+ * @subpackage Option
+ */
+
+/**
+ * Retrieves an option value based on an option name.
+ *
+ * If the option does not exist, and a default value is not provided,
+ * boolean false is returned. This could be used to check whether you need
+ * to initialize an option during installation of a plugin, however that
+ * can be done better by using add_option() which will not overwrite
+ * existing options.
+ *
+ * Not initializing an option and using boolean `false` as a return value
+ * is a bad practice as it triggers an additional database query.
+ *
+ * The type of the returned value can be different from the type that was passed
+ * when saving or updating the option. If the option value was serialized,
+ * then it will be unserialized when it is returned. In this case the type will
+ * be the same. For example, storing a non-scalar value like an array will
+ * return the same array.
+ *
+ * In most cases non-string scalar and null values will be converted and returned
+ * as string equivalents.
+ *
+ * Exceptions:
+ *
+ * 1. When the option has not been saved in the database, the `$default_value` value
+ *    is returned if provided. If not, boolean `false` is returned.
+ * 2. When one of the Options API filters is used: {@see 'pre_option_$option'},
+ *    {@see 'default_option_$option'}, or {@see 'option_$option'}, the returned
+ *    value may not match the expected type.
+ * 3. When the option has just been saved in the database, and get_option()
+ *    is used right after, non-string scalar and null values are not converted to
+ *    string equivalents and the original type is returned.
+ *
+ * Examples:
+ *
+ * When adding options like this: `add_option( 'my_option_name', 'value' )`
+ * and then retrieving them with `get_option( 'my_option_name' )`, the returned
+ * values will be:
+ *
+ *   - `false` returns `string(0) ""`
+ *   - `true`  returns `string(1) "1"`
+ *   - `0`     returns `string(1) "0"`
+ *   - `1`     returns `string(1) "1"`
+ *   - `'0'`   returns `string(1) "0"`
+ *   - `'1'`   returns `string(1) "1"`
+ *   - `null`  returns `string(0) ""`
+ *
+ * When adding options with non-scalar values like
+ * `add_option( 'my_array', array( false, 'str', null ) )`, the returned value
+ * will be identical to the original as it is serialized before saving
+ * it in the database:
+ *
+ *     array(3) {
+ *         [0] => bool(false)
+ *         [1] => string(3) "str"
+ *         [2] => NULL
+ *     }
+ *
+ * @since 1.5.0
+ *
+ * @global wpdb $wpdb WordPress database abstraction object.
+ *
+ * @param string $option        Name of the option to retrieve. Expected to not be SQL-escaped.
+ * @param mixed  $default_value Optional. Default value to return if the option does not exist.
+ * @return mixed Value of the option. A value of any type may be returned, including
+ *               scalar (string, boolean, float, integer), null, array, object.
+ *               Scalar and null values will be returned as strings as long as they originate
+ *               from a database stored option value. If there is no option in the database,
+ *               boolean `false` is returned.
+ */
+function get_option( $option, $default_value = false ) {
+	global $wpdb;
+
+	if ( is_scalar( $option ) ) {
+		$option = trim( $option );
+	}
+
+	if ( empty( $option ) ) {
+		return false;
+	}
+
+	/*
+	 * Until a proper _deprecated_option() function can be introduced,
+	 * redirect requests to deprecated keys to the new, correct ones.
+	 */
+	$deprecated_keys = array(
+		'blacklist_keys'    => 'disallowed_keys',
+		'comment_whitelist' => 'comment_previously_approved',
+	);
+
+	if ( isset( $deprecated_keys[ $option ] ) && ! wp_installing() ) {
+		_deprecated_argument(
+			__FUNCTION__,
+			'5.5.0',
+			sprintf(
+				/* translators: 1: Deprecated option key, 2: New option key. */
+				__( 'The "%1$s" option key has been renamed to "%2$s".' ),
+				$option,
+				$deprecated_keys[ $option ]
+			)
+		);
+		return get_option( $deprecated_keys[ $option ], $default_value );
+	}
+
+	/**
+	 * Filters the value of an existing option before it is retrieved.
+	 *
+	 * The dynamic portion of the hook name, `$option`, refers to the option name.
+	 *
+	 * Returning a value other than false from the filter will short-circuit retrieval
+	 * and return that value instead.
+	 *
+	 * @since 1.5.0
+	 * @since 4.4.0 The `$option` parameter was added.
+	 * @since 4.9.0 The `$default_value` parameter was added.
+	 *
+	 * @param mixed  $pre_option    The value to return instead of the option value. This differs from
+	 *                              `$default_value`, which is used as the fallback value in the event
+	 *                              the option doesn't exist elsewhere in get_option().
+	 *                              Default false (to skip past the short-circuit).
+	 * @param string $option        Option name.
+	 * @param mixed  $default_value The fallback value to return if the option does not exist.
+	 *                              Default false.
+	 */
+	$pre = apply_filters( "pre_option_{$option}", false, $option, $default_value );
+
+	/**
+	 * Filters the value of all existing options before it is retrieved.
+	 *
+	 * Returning a truthy value from the filter will effectively short-circuit retrieval
+	 * and return the passed value instead.
+	 *
+	 * @since 6.1.0
+	 *
+	 * @param mixed  $pre_option    The value to return instead of the option value. This differs from
+	 *                              `$default_value`, which is used as the fallback value in the event
+	 *                              the option doesn't exist elsewhere in get_option().
+	 *                              Default false (to skip past the short-circuit).
+	 * @param string $option        Name of the option.
+	 * @param mixed  $default_value The fallback value to return if the option does not exist.
+	 *                              Default false.
+	 */
+	$pre = apply_filters( 'pre_option', $pre, $option, $default_value );
+
+	if ( false !== $pre ) {
+		return $pre;
+	}
+
+	if ( defined( 'WP_SETUP_CONFIG' ) ) {
+		return false;
+	}
+
+	// Distinguish between `false` as a default, and not passing one.
+	$passed_default = func_num_args() > 1;
+
+	if ( ! wp_installing() ) {
+		$alloptions = wp_load_alloptions();
+
+		if ( isset( $alloptions[ $option ] ) ) {
+			$value = $alloptions[ $option ];
+		} else {
+			$value = wp_cache_get( $option, 'options' );
+
+			if ( false === $value ) {
+				// Prevent non-existent options from triggering multiple queries.
+				$notoptions = wp_cache_get( 'notoptions', 'options' );
+
+				// Prevent non-existent `notoptions` key from triggering multiple key lookups.
+				if ( ! is_array( $notoptions ) ) {
+					$notoptions = array();
+					wp_cache_set( 'notoptions', $notoptions, 'options' );
+				} elseif ( isset( $notoptions[ $option ] ) ) {
+					/**
+					 * Filters the default value for an option.
+					 *
+					 * The dynamic portion of the hook name, `$option`, refers to the option name.
+					 *
+					 * @since 3.4.0
+					 * @since 4.4.0 The `$option` parameter was added.
+					 * @since 4.7.0 The `$passed_default` parameter was added to distinguish between a `false` value and the default parameter value.
+					 *
+					 * @param mixed  $default_value  The default value to return if the option does not exist
+					 *                               in the database.
+					 * @param string $option         Option name.
+					 * @param bool   $passed_default Was `get_option()` passed a default value?
+					 */
+					return apply_filters( "default_option_{$option}", $default_value, $option, $passed_default );
+				}
+
+				$row = $wpdb->get_row( $wpdb->prepare( "SELECT option_value FROM $wpdb->options WHERE option_name = %s LIMIT 1", $option ) );
+
+				// Has to be get_row() instead of get_var() because of funkiness with 0, false, null values.
+				if ( is_object( $row ) ) {
+					$value = $row->option_value;
+					wp_cache_add( $option, $value, 'options' );
+				} else { // Option does not exist, so we must cache its non-existence.
+					$notoptions[ $option ] = true;
+					wp_cache_set( 'notoptions', $notoptions, 'options' );
+
+					/** This filter is documented in wp-includes/option.php */
+					return apply_filters( "default_option_{$option}", $default_value, $option, $passed_default );
+				}
+			}
+		}
+	} else {
+		$suppress = $wpdb->suppress_errors();
+		$row      = $wpdb->get_row( $wpdb->prepare( "SELECT option_value FROM $wpdb->options WHERE option_name = %s LIMIT 1", $option ) );
+		$wpdb->suppress_errors( $suppress );
+
+		if ( is_object( $row ) ) {
+			$value = $row->option_value;
+		} else {
+			/** This filter is documented in wp-includes/option.php */
+			return apply_filters( "default_option_{$option}", $default_value, $option, $passed_default );
+		}
+	}
+
+	// If home is not set, use siteurl.
+	if ( 'home' === $option && '' === $value ) {
+		return get_option( 'siteurl' );
+	}
+
+	if ( in_array( $option, array( 'siteurl', 'home', 'category_base', 'tag_base' ), true ) ) {
+		$value = untrailingslashit( $value );
+	}
+
+	/**
+	 * Filters the value of an existing option.
+	 *
+	 * The dynamic portion of the hook name, `$option`, refers to the option name.
+	 *
+	 * @since 1.5.0 As 'option_' . $setting
+	 * @since 3.0.0
+	 * @since 4.4.0 The `$option` parameter was added.
+	 *
+	 * @param mixed  $value  Value of the option. If stored serialized, it will be
+	 *                       unserialized prior to being returned.
+	 * @param string $option Option name.
+	 */
+	return apply_filters( "option_{$option}", maybe_unserialize( $value ), $option );
+}
+
+/**
+ * Primes specific options into the cache with a single database query.
+ *
+ * Only options that do not already exist in cache will be loaded.
+ *
+ * @since 6.4.0
+ *
+ * @global wpdb $wpdb WordPress database abstraction object.
+ *
+ * @param array $options An array of option names to be loaded.
+ */
+function wp_prime_option_caches( $options ) {
+	$alloptions     = wp_load_alloptions();
+	$cached_options = wp_cache_get_multiple( $options, 'options' );
+	$notoptions     = wp_cache_get( 'notoptions', 'options' );
+	if ( ! is_array( $notoptions ) ) {
+		$notoptions = array();
+	}
+
+	// Filter options that are not in the cache.
+	$options_to_prime = array();
+	foreach ( $options as $option ) {
+		if (
+			( ! isset( $cached_options[ $option ] ) || false === $cached_options[ $option ] )
+			&& ! isset( $alloptions[ $option ] )
+			&& ! isset( $notoptions[ $option ] )
+		) {
+			$options_to_prime[] = $option;
+		}
+	}
+
+	// Bail early if there are no options to be loaded.
+	if ( empty( $options_to_prime ) ) {
+		return;
+	}
+
+	global $wpdb;
+	$results = $wpdb->get_results(
+		$wpdb->prepare(
+			sprintf(
+				"SELECT option_name, option_value FROM $wpdb->options WHERE option_name IN (%s)",
+				implode( ',', array_fill( 0, count( $options_to_prime ), '%s' ) )
+			),
+			$options_to_prime
+		)
+	);
+
+	$options_found = array();
+	foreach ( $results as $result ) {
+		/*
+		 * The cache is primed with the raw value (i.e. not maybe_unserialized).
+		 *
+		 * `get_option()` will handle unserializing the value as needed.
+		 */
+		$options_found[ $result->option_name ] = $result->option_value;
+	}
+	wp_cache_set_multiple( $options_found, 'options' );
+
+	// If all options were found, no need to update `notoptions` cache.
+	if ( count( $options_found ) === count( $options_to_prime ) ) {
+		return;
+	}
+
+	$options_not_found = array_diff( $options_to_prime, array_keys( $options_found ) );
+
+	// Add the options that were not found to the cache.
+	$update_notoptions = false;
+	foreach ( $options_not_found as $option_name ) {
+		if ( ! isset( $notoptions[ $option_name ] ) ) {
+			$notoptions[ $option_name ] = true;
+			$update_notoptions          = true;
+		}
+	}
+
+	// Only update the cache if it was modified.
+	if ( $update_notoptions ) {
+		wp_cache_set( 'notoptions', $notoptions, 'options' );
+	}
+}
+
+/**
+ * Primes the cache of all options registered with a specific option group.
+ *
+ * @since 6.4.0
+ *
+ * @global array $new_allowed_options
+ *
+ * @param string $option_group The option group to load options for.
+ */
+function wp_prime_option_caches_by_group( $option_group ) {
+	global $new_allowed_options;
+
+	if ( isset( $new_allowed_options[ $option_group ] ) ) {
+		wp_prime_option_caches( $new_allowed_options[ $option_group ] );
+	}
+}
+
+/**
+ * Retrieves multiple options.
+ *
+ * Options are loaded as necessary first in order to use a single database query at most.
+ *
+ * @since 6.4.0
+ *
+ * @param array $options An array of option names to retrieve.
+ * @return array An array of key-value pairs for the requested options.
+ */
+function get_options( $options ) {
+	wp_prime_option_caches( $options );
+
+	$result = array();
+	foreach ( $options as $option ) {
+		$result[ $option ] = get_option( $option );
+	}
+
+	return $result;
+}
+
+/**
+ * Sets the autoload values for multiple options in the database.
+ *
+ * Autoloading too many options can lead to performance problems, especially if the options are not frequently used.
+ * This function allows modifying the autoload value for multiple options without changing the actual option value.
+ * This is for example recommended for plugin activation and deactivation hooks, to ensure any options exclusively used
+ * by the plugin which are generally autoloaded can be set to not autoload when the plugin is inactive.
+ *
+ * @since 6.4.0
+ *
+ * @global wpdb $wpdb WordPress database abstraction object.
+ *
+ * @param array $options Associative array of option names and their autoload values to set. The option names are
+ *                       expected to not be SQL-escaped. The autoload values accept 'yes'|true to enable or 'no'|false
+ *                       to disable.
+ * @return array Associative array of all provided $options as keys and boolean values for whether their autoload value
+ *               was updated.
+ */
+function wp_set_option_autoload_values( array $options ) {
+	global $wpdb;
+
+	if ( ! $options ) {
+		return array();
+	}
+
+	$grouped_options = array(
+		'yes' => array(),
+		'no'  => array(),
+	);
+	$results         = array();
+	foreach ( $options as $option => $autoload ) {
+		wp_protect_special_option( $option ); // Ensure only valid options can be passed.
+		if ( 'no' === $autoload || false === $autoload ) { // Sanitize autoload value and categorize accordingly.
+			$grouped_options['no'][] = $option;
+		} else {
+			$grouped_options['yes'][] = $option;
+		}
+		$results[ $option ] = false; // Initialize result value.
+	}
+
+	$where      = array();
+	$where_args = array();
+	foreach ( $grouped_options as $autoload => $options ) {
+		if ( ! $options ) {
+			continue;
+		}
+		$placeholders = implode( ',', array_fill( 0, count( $options ), '%s' ) );
+		$where[]      = "autoload != '%s' AND option_name IN ($placeholders)";
+		$where_args[] = $autoload;
+		foreach ( $options as $option ) {
+			$where_args[] = $option;
+		}
+	}
+	$where = 'WHERE ' . implode( ' OR ', $where );
+
+	/*
+	 * Determine the relevant options that do not already use the given autoload value.
+	 * If no options are returned, no need to update.
+	 */
+	// phpcs:ignore WordPress.DB.PreparedSQL.InterpolatedNotPrepared,WordPress.DB.PreparedSQLPlaceholders.UnfinishedPrepare
+	$options_to_update = $wpdb->get_col( $wpdb->prepare( "SELECT option_name FROM $wpdb->options $where", $where_args ) );
+	if ( ! $options_to_update ) {
+		return $results;
+	}
+
+	// Run UPDATE queries as needed (maximum 2) to update the relevant options' autoload values to 'yes' or 'no'.
+	foreach ( $grouped_options as $autoload => $options ) {
+		if ( ! $options ) {
+			continue;
+		}
+		$options                      = array_intersect( $options, $options_to_update );
+		$grouped_options[ $autoload ] = $options;
+		if ( ! $grouped_options[ $autoload ] ) {
+			continue;
+		}
+
+		// Run query to update autoload value for all the options where it is needed.
+		$success = $wpdb->query(
+			$wpdb->prepare(
+				"UPDATE $wpdb->options SET autoload = %s WHERE option_name IN (" . implode( ',', array_fill( 0, count( $grouped_options[ $autoload ] ), '%s' ) ) . ')',
+				array_merge(
+					array( $autoload ),
+					$grouped_options[ $autoload ]
+				)
+			)
+		);
+		if ( ! $success ) {
+			// Set option list to an empty array to indicate no options were updated.
+			$grouped_options[ $autoload ] = array();
+			continue;
+		}
+
+		// Assume that on success all options were updated, which should be the case given only new values are sent.
+		foreach ( $grouped_options[ $autoload ] as $option ) {
+			$results[ $option ] = true;
+		}
+	}
+
+	/*
+	 * If any options were changed to 'yes', delete their individual caches, and delete 'alloptions' cache so that it
+	 * is refreshed as needed.
+	 * If no options were changed to 'yes' but any options were changed to 'no', delete them from the 'alloptions'
+	 * cache. This is not necessary when options were changed to 'yes', since in that situation the entire cache is
+	 * deleted anyway.
+	 */
+	if ( $grouped_options['yes'] ) {
+		wp_cache_delete_multiple( $grouped_options['yes'], 'options' );
+		wp_cache_delete( 'alloptions', 'options' );
+	} elseif ( $grouped_options['no'] ) {
+		$alloptions = wp_load_alloptions( true );
+		foreach ( $grouped_options['no'] as $option ) {
+			if ( isset( $alloptions[ $option ] ) ) {
+				unset( $alloptions[ $option ] );
+			}
+		}
+		wp_cache_set( 'alloptions', $alloptions, 'options' );
+	}
+
+	return $results;
+}
+
+/**
+ * Sets the autoload value for multiple options in the database.
+ *
+ * This is a wrapper for {@see wp_set_option_autoload_values()}, which can be used to set different autoload values for
+ * each option at once.
+ *
+ * @since 6.4.0
+ *
+ * @see wp_set_option_autoload_values()
+ *
+ * @param array       $options  List of option names. Expected to not be SQL-escaped.
+ * @param string|bool $autoload Autoload value to control whether to load the options when WordPress starts up.
+ *                              Accepts 'yes'|true to enable or 'no'|false to disable.
+ * @return array Associative array of all provided $options as keys and boolean values for whether their autoload value
+ *               was updated.
+ */
+function wp_set_options_autoload( array $options, $autoload ) {
+	return wp_set_option_autoload_values(
+		array_fill_keys( $options, $autoload )
+	);
+}
+
+/**
+ * Sets the autoload value for an option in the database.
+ *
+ * This is a wrapper for {@see wp_set_option_autoload_values()}, which can be used to set the autoload value for
+ * multiple options at once.
+ *
+ * @since 6.4.0
+ *
+ * @see wp_set_option_autoload_values()
+ *
+ * @param string      $option   Name of the option. Expected to not be SQL-escaped.
+ * @param string|bool $autoload Autoload value to control whether to load the option when WordPress starts up.
+ *                              Accepts 'yes'|true to enable or 'no'|false to disable.
+ * @return bool True if the autoload value was modified, false otherwise.
+ */
+function wp_set_option_autoload( $option, $autoload ) {
+	$result = wp_set_option_autoload_values( array( $option => $autoload ) );
+	if ( isset( $result[ $option ] ) ) {
+		return $result[ $option ];
+	}
+	return false;
+}
+
+/**
+ * Protects WordPress special option from being modified.
+ *
+ * Will die if $option is in protected list. Protected options are 'alloptions'
+ * and 'notoptions' options.
+ *
+ * @since 2.2.0
+ *
+ * @param string $option Option name.
+ */
+function wp_protect_special_option( $option ) {
+	if ( 'alloptions' === $option || 'notoptions' === $option ) {
+		wp_die(
+			sprintf(
+				/* translators: %s: Option name. */
+				__( '%s is a protected WP option and may not be modified' ),
+				esc_html( $option )
+			)
+		);
+	}
+}
+
+/**
+ * Prints option value after sanitizing for forms.
+ *
+ * @since 1.5.0
+ *
+ * @param string $option Option name.
+ */
+function form_option( $option ) {
+	echo esc_attr( get_option( $option ) );
+}
+
+/**
+ * Loads and caches all autoloaded options, if available or all options.
+ *
+ * @since 2.2.0
+ * @since 5.3.1 The `$force_cache` parameter was added.
+ *
+ * @global wpdb $wpdb WordPress database abstraction object.
+ *
+ * @param bool $force_cache Optional. Whether to force an update of the local cache
+ *                          from the persistent cache. Default false.
+ * @return array List of all options.
+ */
+function wp_load_alloptions( $force_cache = false ) {
+	global $wpdb;
+
+	/**
+	 * Filters the array of alloptions before it is populated.
+	 *
+	 * Returning an array from the filter will effectively short circuit
+	 * wp_load_alloptions(), returning that value instead.
+	 *
+	 * @since 6.2.0
+	 *
+	 * @param array|null $alloptions  An array of alloptions. Default null.
+	 * @param bool       $force_cache Whether to force an update of the local cache from the persistent cache. Default false.
+	 */
+	$alloptions = apply_filters( 'pre_wp_load_alloptions', null, $force_cache );
+	if ( is_array( $alloptions ) ) {
+		return $alloptions;
+	}
+
+	if ( ! wp_installing() || ! is_multisite() ) {
+		$alloptions = wp_cache_get( 'alloptions', 'options', $force_cache );
+	} else {
+		$alloptions = false;
+	}
+
+	if ( ! $alloptions ) {
+		$suppress      = $wpdb->suppress_errors();
+		$alloptions_db = $wpdb->get_results( "SELECT option_name, option_value FROM $wpdb->options WHERE autoload = 'yes'" );
+		if ( ! $alloptions_db ) {
+			$alloptions_db = $wpdb->get_results( "SELECT option_name, option_value FROM $wpdb->options" );
+		}
+		$wpdb->suppress_errors( $suppress );
+
+		$alloptions = array();
+		foreach ( (array) $alloptions_db as $o ) {
+			$alloptions[ $o->option_name ] = $o->option_value;
+		}
+
+		if ( ! wp_installing() || ! is_multisite() ) {
+			/**
+			 * Filters all options before caching them.
+			 *
+			 * @since 4.9.0
+			 *
+			 * @param array $alloptions Array with all options.
+			 */
+			$alloptions = apply_filters( 'pre_cache_alloptions', $alloptions );
+
+			wp_cache_add( 'alloptions', $alloptions, 'options' );
+		}
+	}
+
+	/**
+	 * Filters all options after retrieving them.
+	 *
+	 * @since 4.9.0
+	 *
+	 * @param array $alloptions Array with all options.
+	 */
+	return apply_filters( 'alloptions', $alloptions );
+}
+
+/**
+ * Loads and primes caches of certain often requested network options if is_multisite().
+ *
+ * @since 3.0.0
+ * @since 6.3.0 Also prime caches for network options when persistent object cache is enabled.
+ *
+ * @global wpdb $wpdb WordPress database abstraction object.
+ *
+ * @param int $network_id Optional. Network ID of network for which to prime network options cache. Defaults to current network.
+ */
+function wp_load_core_site_options( $network_id = null ) {
+	global $wpdb;
+
+	if ( ! is_multisite() || wp_installing() ) {
+		return;
+	}
+
+	if ( empty( $network_id ) ) {
+		$network_id = get_current_network_id();
+	}
+
+	$core_options = array( 'site_name', 'siteurl', 'active_sitewide_plugins', '_site_transient_timeout_theme_roots', '_site_transient_theme_roots', 'site_admins', 'can_compress_scripts', 'global_terms_enabled', 'ms_files_rewriting' );
+
+	if ( wp_using_ext_object_cache() ) {
+		$cache_keys = array();
+		foreach ( $core_options as $option ) {
+			$cache_keys[] = "{$network_id}:{$option}";
+		}
+		wp_cache_get_multiple( $cache_keys, 'site-options' );
+
+		return;
+	}
+
+	$core_options_in = "'" . implode( "', '", $core_options ) . "'";
+	$options         = $wpdb->get_results( $wpdb->prepare( "SELECT meta_key, meta_value FROM $wpdb->sitemeta WHERE meta_key IN ($core_options_in) AND site_id = %d", $network_id ) );
+
+	$data = array();
+	foreach ( $options as $option ) {
+		$key                = $option->meta_key;
+		$cache_key          = "{$network_id}:$key";
+		$option->meta_value = maybe_unserialize( $option->meta_value );
+
+		$data[ $cache_key ] = $option->meta_value;
+	}
+	wp_cache_set_multiple( $data, 'site-options' );
+}
+
+/**
+ * Updates the value of an option that was already added.
+ *
+ * You do not need to serialize values. If the value needs to be serialized,
+ * then it will be serialized before it is inserted into the database.
+ * Remember, resources cannot be serialized or added as an option.
+ *
+ * If the option does not exist, it will be created.
+
+ * This function is designed to work with or without a logged-in user. In terms of security,
+ * plugin developers should check the current user's capabilities before updating any options.
+ *
+ * @since 1.0.0
+ * @since 4.2.0 The `$autoload` parameter was added.
+ *
+ * @global wpdb $wpdb WordPress database abstraction object.
+ *
+ * @param string      $option   Name of the option to update. Expected to not be SQL-escaped.
+ * @param mixed       $value    Option value. Must be serializable if non-scalar. Expected to not be SQL-escaped.
+ * @param string|bool $autoload Optional. Whether to load the option when WordPress starts up. For existing options,
+ *                              `$autoload` can only be updated using `update_option()` if `$value` is also changed.
+ *                              Accepts 'yes'|true to enable or 'no'|false to disable.
+ *                              Autoloading too many options can lead to performance problems, especially if the
+ *                              options are not frequently used. For options which are accessed across several places
+ *                              in the frontend, it is recommended to autoload them, by using 'yes'|true.
+ *                              For options which are accessed only on few specific URLs, it is recommended
+ *                              to not autoload them, by using 'no'|false. For non-existent options, the default value
+ *                              is 'yes'. Default null.
+ * @return bool True if the value was updated, false otherwise.
+ */
+function update_option( $option, $value, $autoload = null ) {
+	global $wpdb;
+
+	if ( is_scalar( $option ) ) {
+		$option = trim( $option );
+	}
+
+	if ( empty( $option ) ) {
+		return false;
+	}
+
+	/*
+	 * Until a proper _deprecated_option() function can be introduced,
+	 * redirect requests to deprecated keys to the new, correct ones.
+	 */
+	$deprecated_keys = array(
+		'blacklist_keys'    => 'disallowed_keys',
+		'comment_whitelist' => 'comment_previously_approved',
+	);
+
+	if ( isset( $deprecated_keys[ $option ] ) && ! wp_installing() ) {
+		_deprecated_argument(
+			__FUNCTION__,
+			'5.5.0',
+			sprintf(
+				/* translators: 1: Deprecated option key, 2: New option key. */
+				__( 'The "%1$s" option key has been renamed to "%2$s".' ),
+				$option,
+				$deprecated_keys[ $option ]
+			)
+		);
+		return update_option( $deprecated_keys[ $option ], $value, $autoload );
+	}
+
+	wp_protect_special_option( $option );
+
+	if ( is_object( $value ) ) {
+		$value = clone $value;
+	}
+
+	$value     = sanitize_option( $option, $value );
+	$old_value = get_option( $option );
+
+	/**
+	 * Filters a specific option before its value is (maybe) serialized and updated.
+	 *
+	 * The dynamic portion of the hook name, `$option`, refers to the option name.
+	 *
+	 * @since 2.6.0
+	 * @since 4.4.0 The `$option` parameter was added.
+	 *
+	 * @param mixed  $value     The new, unserialized option value.
+	 * @param mixed  $old_value The old option value.
+	 * @param string $option    Option name.
+	 */
+	$value = apply_filters( "pre_update_option_{$option}", $value, $old_value, $option );
+
+	/**
+	 * Filters an option before its value is (maybe) serialized and updated.
+	 *
+	 * @since 3.9.0
+	 *
+	 * @param mixed  $value     The new, unserialized option value.
+	 * @param string $option    Name of the option.
+	 * @param mixed  $old_value The old option value.
+	 */
+	$value = apply_filters( 'pre_update_option', $value, $option, $old_value );
+
+	/*
+	 * If the new and old values are the same, no need to update.
+	 *
+	 * Unserialized values will be adequate in most cases. If the unserialized
+	 * data differs, the (maybe) serialized data is checked to avoid
+	 * unnecessary database calls for otherwise identical object instances.
+	 *
+	 * See https://core.trac.wordpress.org/ticket/38903
+	 */
+	if ( $value === $old_value || maybe_serialize( $value ) === maybe_serialize( $old_value ) ) {
+		return false;
+	}
+
+	/** This filter is documented in wp-includes/option.php */
+	if ( apply_filters( "default_option_{$option}", false, $option, false ) === $old_value ) {
+		// Default setting for new options is 'yes'.
+		if ( null === $autoload ) {
+			$autoload = 'yes';
+		}
+
+		return add_option( $option, $value, '', $autoload );
+	}
+
+	$serialized_value = maybe_serialize( $value );
+
+	/**
+	 * Fires immediately before an option value is updated.
+	 *
+	 * @since 2.9.0
+	 *
+	 * @param string $option    Name of the option to update.
+	 * @param mixed  $old_value The old option value.
+	 * @param mixed  $value     The new option value.
+	 */
+	do_action( 'update_option', $option, $old_value, $value );
+
+	$update_args = array(
+		'option_value' => $serialized_value,
+	);
+
+	if ( null !== $autoload ) {
+		$update_args['autoload'] = ( 'no' === $autoload || false === $autoload ) ? 'no' : 'yes';
+	}
+
+	$result = $wpdb->update( $wpdb->options, $update_args, array( 'option_name' => $option ) );
+	if ( ! $result ) {
+		return false;
+	}
+
+	$notoptions = wp_cache_get( 'notoptions', 'options' );
+
+	if ( is_array( $notoptions ) && isset( $notoptions[ $option ] ) ) {
+		unset( $notoptions[ $option ] );
+		wp_cache_set( 'notoptions', $notoptions, 'options' );
+	}
+
+	if ( ! wp_installing() ) {
+		if ( ! isset( $update_args['autoload'] ) ) {
+			// Update the cached value based on where it is currently cached.
+			$alloptions = wp_load_alloptions( true );
+			if ( isset( $alloptions[ $option ] ) ) {
+				$alloptions[ $option ] = $serialized_value;
+				wp_cache_set( 'alloptions', $alloptions, 'options' );
+			} else {
+				wp_cache_set( $option, $serialized_value, 'options' );
+			}
+		} elseif ( 'yes' === $update_args['autoload'] ) {
+			// Delete the individual cache, then set in alloptions cache.
+			wp_cache_delete( $option, 'options' );
+
+			$alloptions = wp_load_alloptions( true );
+			$alloptions[ $option ] = $serialized_value;
+			wp_cache_set( 'alloptions', $alloptions, 'options' );
+		} else {
+			// Delete the alloptions cache, then set the individual cache.
+			$alloptions = wp_load_alloptions( true );
+			if ( isset( $alloptions[ $option ] ) ) {
+				unset( $alloptions[ $option ] );
+				wp_cache_set( 'alloptions', $alloptions, 'options' );
+			}
+
+			wp_cache_set( $option, $serialized_value, 'options' );
+		}
+	}
+
+	/**
+	 * Fires after the value of a specific option has been successfully updated.
+	 *
+	 * The dynamic portion of the hook name, `$option`, refers to the option name.
+	 *
+	 * @since 2.0.1
+	 * @since 4.4.0 The `$option` parameter was added.
+	 *
+	 * @param mixed  $old_value The old option value.
+	 * @param mixed  $value     The new option value.
+	 * @param string $option    Option name.
+	 */
+	do_action( "update_option_{$option}", $old_value, $value, $option );
+
+	/**
+	 * Fires after the value of an option has been successfully updated.
+	 *
+	 * @since 2.9.0
+	 *
+	 * @param string $option    Name of the updated option.
+	 * @param mixed  $old_value The old option value.
+	 * @param mixed  $value     The new option value.
+	 */
+	do_action( 'updated_option', $option, $old_value, $value );
+
+	return true;
+}
+
+/**
+ * Adds a new option.
+ *
+ * You do not need to serialize values. If the value needs to be serialized,
+ * then it will be serialized before it is inserted into the database.
+ * Remember, resources cannot be serialized or added as an option.
+ *
+ * You can create options without values and then update the values later.
+ * Existing options will not be updated and checks are performed to ensure that you
+ * aren't adding a protected WordPress option. Care should be taken to not name
+ * options the same as the ones which are protected.
+ *
+ * @since 1.0.0
+ *
+ * @global wpdb $wpdb WordPress database abstraction object.
+ *
+ * @param string      $option     Name of the option to add. Expected to not be SQL-escaped.
+ * @param mixed       $value      Optional. Option value. Must be serializable if non-scalar.
+ *                                Expected to not be SQL-escaped.
+ * @param string      $deprecated Optional. Description. Not used anymore.
+ * @param string|bool $autoload   Optional. Whether to load the option when WordPress starts up.
+ *                                Accepts 'yes'|true to enable or 'no'|false to disable.
+ *                                Autoloading too many options can lead to performance problems, especially if the
+ *                                options are not frequently used. For options which are accessed across several places
+ *                                in the frontend, it is recommended to autoload them, by using 'yes'|true.
+ *                                For options which are accessed only on few specific URLs, it is recommended
+ *                                to not autoload them, by using 'no'|false. Default 'yes'.
+ * @return bool True if the option was added, false otherwise.
+ */
+function add_option( $option, $value = '', $deprecated = '', $autoload = 'yes' ) {
+	global $wpdb;
+
+	if ( ! empty( $deprecated ) ) {
+		_deprecated_argument( __FUNCTION__, '2.3.0' );
+	}
+
+	if ( is_scalar( $option ) ) {
+		$option = trim( $option );
+	}
+
+	if ( empty( $option ) ) {
+		return false;
+	}
+
+	/*
+	 * Until a proper _deprecated_option() function can be introduced,
+	 * redirect requests to deprecated keys to the new, correct ones.
+	 */
+	$deprecated_keys = array(
+		'blacklist_keys'    => 'disallowed_keys',
+		'comment_whitelist' => 'comment_previously_approved',
+	);
+
+	if ( isset( $deprecated_keys[ $option ] ) && ! wp_installing() ) {
+		_deprecated_argument(
+			__FUNCTION__,
+			'5.5.0',
+			sprintf(
+				/* translators: 1: Deprecated option key, 2: New option key. */
+				__( 'The "%1$s" option key has been renamed to "%2$s".' ),
+				$option,
+				$deprecated_keys[ $option ]
+			)
+		);
+		return add_option( $deprecated_keys[ $option ], $value, $deprecated, $autoload );
+	}
+
+	wp_protect_special_option( $option );
+
+	if ( is_object( $value ) ) {
+		$value = clone $value;
+	}
+
+	$value = sanitize_option( $option, $value );
+
+	/*
+	 * Make sure the option doesn't already exist.
+	 * We can check the 'notoptions' cache before we ask for a DB query.
+	 */
+	$notoptions = wp_cache_get( 'notoptions', 'options' );
+
+	if ( ! is_array( $notoptions ) || ! isset( $notoptions[ $option ] ) ) {
+		/** This filter is documented in wp-includes/option.php */
+		if ( apply_filters( "default_option_{$option}", false, $option, false ) !== get_option( $option ) ) {
+			return false;
+		}
+	}
+
+	$serialized_value = maybe_serialize( $value );
+	$autoload         = ( 'no' === $autoload || false === $autoload ) ? 'no' : 'yes';
+
+	/**
+	 * Fires before an option is added.
+	 *
+	 * @since 2.9.0
+	 *
+	 * @param string $option Name of the option to add.
+	 * @param mixed  $value  Value of the option.
+	 */
+	do_action( 'add_option', $option, $value );
+
+	$result = $wpdb->query( $wpdb->prepare( "INSERT INTO `$wpdb->options` (`option_name`, `option_value`, `autoload`) VALUES (%s, %s, %s) ON DUPLICATE KEY UPDATE `option_name` = VALUES(`option_name`), `option_value` = VALUES(`option_value`), `autoload` = VALUES(`autoload`)", $option, $serialized_value, $autoload ) );
+	if ( ! $result ) {
+		return false;
+	}
+
+	if ( ! wp_installing() ) {
+		if ( 'yes' === $autoload ) {
+			$alloptions            = wp_load_alloptions( true );
+			$alloptions[ $option ] = $serialized_value;
+			wp_cache_set( 'alloptions', $alloptions, 'options' );
+		} else {
+			wp_cache_set( $option, $serialized_value, 'options' );
+		}
+	}
+
+	// This option exists now.
+	$notoptions = wp_cache_get( 'notoptions', 'options' ); // Yes, again... we need it to be fresh.
+
+	if ( is_array( $notoptions ) && isset( $notoptions[ $option ] ) ) {
+		unset( $notoptions[ $option ] );
+		wp_cache_set( 'notoptions', $notoptions, 'options' );
+	}
+
+	/**
+	 * Fires after a specific option has been added.
+	 *
+	 * The dynamic portion of the hook name, `$option`, refers to the option name.
+	 *
+	 * @since 2.5.0 As "add_option_{$name}"
+	 * @since 3.0.0
+	 *
+	 * @param string $option Name of the option to add.
+	 * @param mixed  $value  Value of the option.
+	 */
+	do_action( "add_option_{$option}", $option, $value );
+
+	/**
+	 * Fires after an option has been added.
+	 *
+	 * @since 2.9.0
+	 *
+	 * @param string $option Name of the added option.
+	 * @param mixed  $value  Value of the option.
+	 */
+	do_action( 'added_option', $option, $value );
+
+	return true;
+}
+
+/**
+ * Removes an option by name. Prevents removal of protected WordPress options.
+ *
+ * @since 1.2.0
+ *
+ * @global wpdb $wpdb WordPress database abstraction object.
+ *
+ * @param string $option Name of the option to delete. Expected to not be SQL-escaped.
+ * @return bool True if the option was deleted, false otherwise.
+ */
+function delete_option( $option ) {
+	global $wpdb;
+
+	if ( is_scalar( $option ) ) {
+		$option = trim( $option );
+	}
+
+	if ( empty( $option ) ) {
+		return false;
+	}
+
+	wp_protect_special_option( $option );
+
+	// Get the ID, if no ID then return.
+	$row = $wpdb->get_row( $wpdb->prepare( "SELECT autoload FROM $wpdb->options WHERE option_name = %s", $option ) );
+	if ( is_null( $row ) ) {
+		return false;
+	}
+
+	/**
+	 * Fires immediately before an option is deleted.
+	 *
+	 * @since 2.9.0
+	 *
+	 * @param string $option Name of the option to delete.
+	 */
+	do_action( 'delete_option', $option );
+
+	$result = $wpdb->delete( $wpdb->options, array( 'option_name' => $option ) );
+
+	if ( ! wp_installing() ) {
+		if ( 'yes' === $row->autoload ) {
+			$alloptions = wp_load_alloptions( true );
+			if ( is_array( $alloptions ) && isset( $alloptions[ $option ] ) ) {
+				unset( $alloptions[ $option ] );
+				wp_cache_set( 'alloptions', $alloptions, 'options' );
+			}
+		} else {
+			wp_cache_delete( $option, 'options' );
+		}
+	}
+
+	if ( $result ) {
+
+		/**
+		 * Fires after a specific option has been deleted.
+		 *
+		 * The dynamic portion of the hook name, `$option`, refers to the option name.
+		 *
+		 * @since 3.0.0
+		 *
+		 * @param string $option Name of the deleted option.
+		 */
+		do_action( "delete_option_{$option}", $option );
+
+		/**
+		 * Fires after an option has been deleted.
+		 *
+		 * @since 2.9.0
+		 *
+		 * @param string $option Name of the deleted option.
+		 */
+		do_action( 'deleted_option', $option );
+
+		return true;
+	}
+
+	return false;
+}
+
+/**
+ * Deletes a transient.
+ *
+ * @since 2.8.0
+ *
+ * @param string $transient Transient name. Expected to not be SQL-escaped.
+ * @return bool True if the transient was deleted, false otherwise.
+ */
+function delete_transient( $transient ) {
+
+	/**
+	 * Fires immediately before a specific transient is deleted.
+	 *
+	 * The dynamic portion of the hook name, `$transient`, refers to the transient name.
+	 *
+	 * @since 3.0.0
+	 *
+	 * @param string $transient Transient name.
+	 */
+	do_action( "delete_transient_{$transient}", $transient );
+
+	if ( wp_using_ext_object_cache() || wp_installing() ) {
+		$result = wp_cache_delete( $transient, 'transient' );
+	} else {
+		$option_timeout = '_transient_timeout_' . $transient;
+		$option         = '_transient_' . $transient;
+		$result         = delete_option( $option );
+
+		if ( $result ) {
+			delete_option( $option_timeout );
+		}
+	}
+
+	if ( $result ) {
+
+		/**
+		 * Fires after a transient is deleted.
+		 *
+		 * @since 3.0.0
+		 *
+		 * @param string $transient Deleted transient name.
+		 */
+		do_action( 'deleted_transient', $transient );
+	}
+
+	return $result;
+}
+
+/**
+ * Retrieves the value of a transient.
+ *
+ * If the transient does not exist, does not have a value, or has expired,
+ * then the return value will be false.
+ *
+ * @since 2.8.0
+ *
+ * @param string $transient Transient name. Expected to not be SQL-escaped.
+ * @return mixed Value of transient.
+ */
+function get_transient( $transient ) {
+
+	/**
+	 * Filters the value of an existing transient before it is retrieved.
+	 *
+	 * The dynamic portion of the hook name, `$transient`, refers to the transient name.
+	 *
+	 * Returning a value other than false from the filter will short-circuit retrieval
+	 * and return that value instead.
+	 *
+	 * @since 2.8.0
+	 * @since 4.4.0 The `$transient` parameter was added
+	 *
+	 * @param mixed  $pre_transient The default value to return if the transient does not exist.
+	 *                              Any value other than false will short-circuit the retrieval
+	 *                              of the transient, and return that value.
+	 * @param string $transient     Transient name.
+	 */
+	$pre = apply_filters( "pre_transient_{$transient}", false, $transient );
+
+	if ( false !== $pre ) {
+		return $pre;
+	}
+
+	if ( wp_using_ext_object_cache() || wp_installing() ) {
+		$value = wp_cache_get( $transient, 'transient' );
+	} else {
+		$transient_option = '_transient_' . $transient;
+		if ( ! wp_installing() ) {
+			// If option is not in alloptions, it is not autoloaded and thus has a timeout.
+			$alloptions = wp_load_alloptions();
+			if ( ! isset( $alloptions[ $transient_option ] ) ) {
+				$transient_timeout = '_transient_timeout_' . $transient;
+				$timeout           = get_option( $transient_timeout );
+				if ( false !== $timeout && $timeout < time() ) {
+					delete_option( $transient_option );
+					delete_option( $transient_timeout );
+					$value = false;
+				}
+			}
+		}
+
+		if ( ! isset( $value ) ) {
+			$value = get_option( $transient_option );
+		}
+	}
+
+	/**
+	 * Filters an existing transient's value.
+	 *
+	 * The dynamic portion of the hook name, `$transient`, refers to the transient name.
+	 *
+	 * @since 2.8.0
+	 * @since 4.4.0 The `$transient` parameter was added
+	 *
+	 * @param mixed  $value     Value of transient.
+	 * @param string $transient Transient name.
+	 */
+	return apply_filters( "transient_{$transient}", $value, $transient );
+}
+
+/**
+ * Sets/updates the value of a transient.
+ *
+ * You do not need to serialize values. If the value needs to be serialized,
+ * then it will be serialized before it is set.
+ *
+ * @since 2.8.0
+ *
+ * @param string $transient  Transient name. Expected to not be SQL-escaped.
+ *                           Must be 172 characters or fewer in length.
+ * @param mixed  $value      Transient value. Must be serializable if non-scalar.
+ *                           Expected to not be SQL-escaped.
+ * @param int    $expiration Optional. Time until expiration in seconds. Default 0 (no expiration).
+ * @return bool True if the value was set, false otherwise.
+ */
+function set_transient( $transient, $value, $expiration = 0 ) {
+
+	$expiration = (int) $expiration;
+
+	/**
+	 * Filters a specific transient before its value is set.
+	 *
+	 * The dynamic portion of the hook name, `$transient`, refers to the transient name.
+	 *
+	 * @since 3.0.0
+	 * @since 4.2.0 The `$expiration` parameter was added.
+	 * @since 4.4.0 The `$transient` parameter was added.
+	 *
+	 * @param mixed  $value      New value of transient.
+	 * @param int    $expiration Time until expiration in seconds.
+	 * @param string $transient  Transient name.
+	 */
+	$value = apply_filters( "pre_set_transient_{$transient}", $value, $expiration, $transient );
+
+	/**
+	 * Filters the expiration for a transient before its value is set.
+	 *
+	 * The dynamic portion of the hook name, `$transient`, refers to the transient name.
+	 *
+	 * @since 4.4.0
+	 *
+	 * @param int    $expiration Time until expiration in seconds. Use 0 for no expiration.
+	 * @param mixed  $value      New value of transient.
+	 * @param string $transient  Transient name.
+	 */
+	$expiration = apply_filters( "expiration_of_transient_{$transient}", $expiration, $value, $transient );
+
+	if ( wp_using_ext_object_cache() || wp_installing() ) {
+		$result = wp_cache_set( $transient, $value, 'transient', $expiration );
+	} else {
+		$transient_timeout = '_transient_timeout_' . $transient;
+		$transient_option  = '_transient_' . $transient;
+
+		if ( false === get_option( $transient_option ) ) {
+			$autoload = 'yes';
+			if ( $expiration ) {
+				$autoload = 'no';
+				add_option( $transient_timeout, time() + $expiration, '', 'no' );
+			}
+			$result = add_option( $transient_option, $value, '', $autoload );
+		} else {
+			/*
+			 * If expiration is requested, but the transient has no timeout option,
+			 * delete, then re-create transient rather than update.
+			 */
+			$update = true;
+
+			if ( $expiration ) {
+				if ( false === get_option( $transient_timeout ) ) {
+					delete_option( $transient_option );
+					add_option( $transient_timeout, time() + $expiration, '', 'no' );
+					$result = add_option( $transient_option, $value, '', 'no' );
+					$update = false;
+				} else {
+					update_option( $transient_timeout, time() + $expiration );
+				}
+			}
+
+			if ( $update ) {
+				$result = update_option( $transient_option, $value );
+			}
+		}
+	}
+
+	if ( $result ) {
+
+		/**
+		 * Fires after the value for a specific transient has been set.
+		 *
+		 * The dynamic portion of the hook name, `$transient`, refers to the transient name.
+		 *
+		 * @since 3.0.0
+		 * @since 3.6.0 The `$value` and `$expiration` parameters were added.
+		 * @since 4.4.0 The `$transient` parameter was added.
+		 *
+		 * @param mixed  $value      Transient value.
+		 * @param int    $expiration Time until expiration in seconds.
+		 * @param string $transient  The name of the transient.
+		 */
+		do_action( "set_transient_{$transient}", $value, $expiration, $transient );
+
+		/**
+		 * Fires after the value for a transient has been set.
+		 *
+		 * @since 3.0.0
+		 * @since 3.6.0 The `$value` and `$expiration` parameters were added.
+		 *
+		 * @param string $transient  The name of the transient.
+		 * @param mixed  $value      Transient value.
+		 * @param int    $expiration Time until expiration in seconds.
+		 */
+		do_action( 'setted_transient', $transient, $value, $expiration );
+	}
+
+	return $result;
+}
+
+/**
+ * Deletes all expired transients.
+ *
+ * Note that this function won't do anything if an external object cache is in use.
+ *
+ * The multi-table delete syntax is used to delete the transient record
+ * from table a, and the corresponding transient_timeout record from table b.
+ *
+ * @global wpdb $wpdb WordPress database abstraction object.
+ *
+ * @since 4.9.0
+ *
+ * @param bool $force_db Optional. Force cleanup to run against the database even when an external object cache is used.
+ */
+function delete_expired_transients( $force_db = false ) {
+	global $wpdb;
+
+	if ( ! $force_db && wp_using_ext_object_cache() ) {
+		return;
+	}
+
+	$wpdb->query(
+		$wpdb->prepare(
+			"DELETE a, b FROM {$wpdb->options} a, {$wpdb->options} b
+			WHERE a.option_name LIKE %s
+			AND a.option_name NOT LIKE %s
+			AND b.option_name = CONCAT( '_transient_timeout_', SUBSTRING( a.option_name, 12 ) )
+			AND b.option_value < %d",
+			$wpdb->esc_like( '_transient_' ) . '%',
+			$wpdb->esc_like( '_transient_timeout_' ) . '%',
+			time()
+		)
+	);
+
+	if ( ! is_multisite() ) {
+		// Single site stores site transients in the options table.
+		$wpdb->query(
+			$wpdb->prepare(
+				"DELETE a, b FROM {$wpdb->options} a, {$wpdb->options} b
+				WHERE a.option_name LIKE %s
+				AND a.option_name NOT LIKE %s
+				AND b.option_name = CONCAT( '_site_transient_timeout_', SUBSTRING( a.option_name, 17 ) )
+				AND b.option_value < %d",
+				$wpdb->esc_like( '_site_transient_' ) . '%',
+				$wpdb->esc_like( '_site_transient_timeout_' ) . '%',
+				time()
+			)
+		);
+	} elseif ( is_multisite() && is_main_site() && is_main_network() ) {
+		// Multisite stores site transients in the sitemeta table.
+		$wpdb->query(
+			$wpdb->prepare(
+				"DELETE a, b FROM {$wpdb->sitemeta} a, {$wpdb->sitemeta} b
+				WHERE a.meta_key LIKE %s
+				AND a.meta_key NOT LIKE %s
+				AND b.meta_key = CONCAT( '_site_transient_timeout_', SUBSTRING( a.meta_key, 17 ) )
+				AND b.meta_value < %d",
+				$wpdb->esc_like( '_site_transient_' ) . '%',
+				$wpdb->esc_like( '_site_transient_timeout_' ) . '%',
+				time()
+			)
+		);
+	}
+}
+
+/**
+ * Saves and restores user interface settings stored in a cookie.
+ *
+ * Checks if the current user-settings cookie is updated and stores it. When no
+ * cookie exists (different browser used), adds the last saved cookie restoring
+ * the settings.
+ *
+ * @since 2.7.0
+ */
+function wp_user_settings() {
+
+	if ( ! is_admin() || wp_doing_ajax() ) {
+		return;
+	}
+
+	$user_id = get_current_user_id();
+	if ( ! $user_id ) {
+		return;
+	}
+
+	if ( ! is_user_member_of_blog() ) {
+		return;
+	}
+
+	$settings = (string) get_user_option( 'user-settings', $user_id );
+
+	if ( isset( $_COOKIE[ 'wp-settings-' . $user_id ] ) ) {
+		$cookie = preg_replace( '/[^A-Za-z0-9=&_]/', '', $_COOKIE[ 'wp-settings-' . $user_id ] );
+
+		// No change or both empty.
+		if ( $cookie === $settings ) {
+			return;
+		}
+
+		$last_saved = (int) get_user_option( 'user-settings-time', $user_id );
+		$current    = isset( $_COOKIE[ 'wp-settings-time-' . $user_id ] ) ? preg_replace( '/[^0-9]/', '', $_COOKIE[ 'wp-settings-time-' . $user_id ] ) : 0;
+
+		// The cookie is newer than the saved value. Update the user_option and leave the cookie as-is.
+		if ( $current > $last_saved ) {
+			update_user_option( $user_id, 'user-settings', $cookie, false );
+			update_user_option( $user_id, 'user-settings-time', time() - 5, false );
+			return;
+		}
+	}
+
+	// The cookie is not set in the current browser or the saved value is newer.
+	$secure = ( 'https' === parse_url( admin_url(), PHP_URL_SCHEME ) );
+	setcookie( 'wp-settings-' . $user_id, $settings, time() + YEAR_IN_SECONDS, SITECOOKIEPATH, '', $secure );
+	setcookie( 'wp-settings-time-' . $user_id, time(), time() + YEAR_IN_SECONDS, SITECOOKIEPATH, '', $secure );
+	$_COOKIE[ 'wp-settings-' . $user_id ] = $settings;
+}
+
+/**
+ * Retrieves user interface setting value based on setting name.
+ *
+ * @since 2.7.0
+ *
+ * @param string       $name          The name of the setting.
+ * @param string|false $default_value Optional. Default value to return when $name is not set. Default false.
+ * @return mixed The last saved user setting or the default value/false if it doesn't exist.
+ */
+function get_user_setting( $name, $default_value = false ) {
+	$all_user_settings = get_all_user_settings();
+
+	return isset( $all_user_settings[ $name ] ) ? $all_user_settings[ $name ] : $default_value;
+}
+
+/**
+ * Adds or updates user interface setting.
+ *
+ * Both `$name` and `$value` can contain only ASCII letters, numbers, hyphens, and underscores.
+ *
+ * This function has to be used before any output has started as it calls `setcookie()`.
+ *
+ * @since 2.8.0
+ *
+ * @param string $name  The name of the setting.
+ * @param string $value The value for the setting.
+ * @return bool|null True if set successfully, false otherwise.
+ *                   Null if the current user is not a member of the site.
+ */
+function set_user_setting( $name, $value ) {
+	if ( headers_sent() ) {
+		return false;
+	}
+
+	$all_user_settings          = get_all_user_settings();
+	$all_user_settings[ $name ] = $value;
+
+	return wp_set_all_user_settings( $all_user_settings );
+}
+
+/**
+ * Deletes user interface settings.
+ *
+ * Deleting settings would reset them to the defaults.
+ *
+ * This function has to be used before any output has started as it calls `setcookie()`.
+ *
+ * @since 2.7.0
+ *
+ * @param string $names The name or array of names of the setting to be deleted.
+ * @return bool|null True if deleted successfully, false otherwise.
+ *                   Null if the current user is not a member of the site.
+ */
+function delete_user_setting( $names ) {
+	if ( headers_sent() ) {
+		return false;
+	}
+
+	$all_user_settings = get_all_user_settings();
+	$names             = (array) $names;
+	$deleted           = false;
+
+	foreach ( $names as $name ) {
+		if ( isset( $all_user_settings[ $name ] ) ) {
+			unset( $all_user_settings[ $name ] );
+			$deleted = true;
+		}
+	}
+
+	if ( $deleted ) {
+		return wp_set_all_user_settings( $all_user_settings );
+	}
+
+	return false;
+}
+
+/**
+ * Retrieves all user interface settings.
+ *
+ * @since 2.7.0
+ *
+ * @global array $_updated_user_settings
+ *
+ * @return array The last saved user settings or empty array.
+ */
+function get_all_user_settings() {
+	global $_updated_user_settings;
+
+	$user_id = get_current_user_id();
+	if ( ! $user_id ) {
+		return array();
+	}
+
+	if ( isset( $_updated_user_settings ) && is_array( $_updated_user_settings ) ) {
+		return $_updated_user_settings;
+	}
+
+	$user_settings = array();
+
+	if ( isset( $_COOKIE[ 'wp-settings-' . $user_id ] ) ) {
+		$cookie = preg_replace( '/[^A-Za-z0-9=&_-]/', '', $_COOKIE[ 'wp-settings-' . $user_id ] );
+
+		if ( strpos( $cookie, '=' ) ) { // '=' cannot be 1st char.
+			parse_str( $cookie, $user_settings );
+		}
+	} else {
+		$option = get_user_option( 'user-settings', $user_id );
+
+		if ( $option && is_string( $option ) ) {
+			parse_str( $option, $user_settings );
+		}
+	}
+
+	$_updated_user_settings = $user_settings;
+	return $user_settings;
+}
+
+/**
+ * Private. Sets all user interface settings.
+ *
+ * @since 2.8.0
+ * @access private
+ *
+ * @global array $_updated_user_settings
+ *
+ * @param array $user_settings User settings.
+ * @return bool|null True if set successfully, false if the current user could not be found.
+ *                   Null if the current user is not a member of the site.
+ */
+function wp_set_all_user_settings( $user_settings ) {
+	global $_updated_user_settings;
+
+	$user_id = get_current_user_id();
+	if ( ! $user_id ) {
+		return false;
+	}
+
+	if ( ! is_user_member_of_blog() ) {
+		return;
+	}
+
+	$settings = '';
+	foreach ( $user_settings as $name => $value ) {
+		$_name  = preg_replace( '/[^A-Za-z0-9_-]+/', '', $name );
+		$_value = preg_replace( '/[^A-Za-z0-9_-]+/', '', $value );
+
+		if ( ! empty( $_name ) ) {
+			$settings .= $_name . '=' . $_value . '&';
+		}
+	}
+
+	$settings = rtrim( $settings, '&' );
+	parse_str( $settings, $_updated_user_settings );
+
+	update_user_option( $user_id, 'user-settings', $settings, false );
+	update_user_option( $user_id, 'user-settings-time', time(), false );
+
+	return true;
+}
+
+/**
+ * Deletes the user settings of the current user.
+ *
+ * @since 2.7.0
+ */
+function delete_all_user_settings() {
+	$user_id = get_current_user_id();
+	if ( ! $user_id ) {
+		return;
+	}
+
+	update_user_option( $user_id, 'user-settings', '', false );
+	setcookie( 'wp-settings-' . $user_id, ' ', time() - YEAR_IN_SECONDS, SITECOOKIEPATH );
+}
+
+/**
+ * Retrieve an option value for the current network based on name of option.
+ *
+ * @since 2.8.0
+ * @since 4.4.0 The `$use_cache` parameter was deprecated.
+ * @since 4.4.0 Modified into wrapper for get_network_option()
+ *
+ * @see get_network_option()
+ *
+ * @param string $option        Name of the option to retrieve. Expected to not be SQL-escaped.
+ * @param mixed  $default_value Optional. Value to return if the option doesn't exist. Default false.
+ * @param bool   $deprecated    Whether to use cache. Multisite only. Always set to true.
+ * @return mixed Value set for the option.
+ */
+function get_site_option( $option, $default_value = false, $deprecated = true ) {
+	return get_network_option( null, $option, $default_value );
+}
+
+/**
+ * Adds a new option for the current network.
+ *
+ * Existing options will not be updated. Note that prior to 3.3 this wasn't the case.
+ *
+ * @since 2.8.0
+ * @since 4.4.0 Modified into wrapper for add_network_option()
+ *
+ * @see add_network_option()
+ *
+ * @param string $option Name of the option to add. Expected to not be SQL-escaped.
+ * @param mixed  $value  Option value, can be anything. Expected to not be SQL-escaped.
+ * @return bool True if the option was added, false otherwise.
+ */
+function add_site_option( $option, $value ) {
+	return add_network_option( null, $option, $value );
+}
+
+/**
+ * Removes an option by name for the current network.
+ *
+ * @since 2.8.0
+ * @since 4.4.0 Modified into wrapper for delete_network_option()
+ *
+ * @see delete_network_option()
+ *
+ * @param string $option Name of the option to delete. Expected to not be SQL-escaped.
+ * @return bool True if the option was deleted, false otherwise.
+ */
+function delete_site_option( $option ) {
+	return delete_network_option( null, $option );
+}
+
+/**
+ * Updates the value of an option that was already added for the current network.
+ *
+ * @since 2.8.0
+ * @since 4.4.0 Modified into wrapper for update_network_option()
+ *
+ * @see update_network_option()
+ *
+ * @param string $option Name of the option. Expected to not be SQL-escaped.
+ * @param mixed  $value  Option value. Expected to not be SQL-escaped.
+ * @return bool True if the value was updated, false otherwise.
+ */
+function update_site_option( $option, $value ) {
+	return update_network_option( null, $option, $value );
+}
+
+/**
+ * Retrieves a network's option value based on the option name.
+ *
+ * @since 4.4.0
+ *
+ * @see get_option()
+ *
+ * @global wpdb $wpdb WordPress database abstraction object.
+ *
+ * @param int    $network_id    ID of the network. Can be null to default to the current network ID.
+ * @param string $option        Name of the option to retrieve. Expected to not be SQL-escaped.
+ * @param mixed  $default_value Optional. Value to return if the option doesn't exist. Default false.
+ * @return mixed Value set for the option.
+ */
+function get_network_option( $network_id, $option, $default_value = false ) {
+	global $wpdb;
+
+	if ( $network_id && ! is_numeric( $network_id ) ) {
+		return false;
+	}
+
+	$network_id = (int) $network_id;
+
+	// Fallback to the current network if a network ID is not specified.
+	if ( ! $network_id ) {
+		$network_id = get_current_network_id();
+	}
+
+	/**
+	 * Filters the value of an existing network option before it is retrieved.
+	 *
+	 * The dynamic portion of the hook name, `$option`, refers to the option name.
+	 *
+	 * Returning a value other than false from the filter will short-circuit retrieval
+	 * and return that value instead.
+	 *
+	 * @since 2.9.0 As 'pre_site_option_' . $key
+	 * @since 3.0.0
+	 * @since 4.4.0 The `$option` parameter was added.
+	 * @since 4.7.0 The `$network_id` parameter was added.
+	 * @since 4.9.0 The `$default_value` parameter was added.
+	 *
+	 * @param mixed  $pre_option    The value to return instead of the option value. This differs from
+	 *                              `$default_value`, which is used as the fallback value in the event
+	 *                              the option doesn't exist elsewhere in get_network_option().
+	 *                              Default false (to skip past the short-circuit).
+	 * @param string $option        Option name.
+	 * @param int    $network_id    ID of the network.
+	 * @param mixed  $default_value The fallback value to return if the option does not exist.
+	 *                              Default false.
+	 */
+	$pre = apply_filters( "pre_site_option_{$option}", false, $option, $network_id, $default_value );
+
+	if ( false !== $pre ) {
+		return $pre;
+	}
+
+	// Prevent non-existent options from triggering multiple queries.
+	$notoptions_key = "$network_id:notoptions";
+	$notoptions     = wp_cache_get( $notoptions_key, 'site-options' );
+
+	if ( is_array( $notoptions ) && isset( $notoptions[ $option ] ) ) {
+
+		/**
+		 * Filters the value of a specific default network option.
+		 *
+		 * The dynamic portion of the hook name, `$option`, refers to the option name.
+		 *
+		 * @since 3.4.0
+		 * @since 4.4.0 The `$option` parameter was added.
+		 * @since 4.7.0 The `$network_id` parameter was added.
+		 *
+		 * @param mixed  $default_value The value to return if the site option does not exist
+		 *                              in the database.
+		 * @param string $option        Option name.
+		 * @param int    $network_id    ID of the network.
+		 */
+		return apply_filters( "default_site_option_{$option}", $default_value, $option, $network_id );
+	}
+
+	if ( ! is_multisite() ) {
+		/** This filter is documented in wp-includes/option.php */
+		$default_value = apply_filters( 'default_site_option_' . $option, $default_value, $option, $network_id );
+		$value         = get_option( $option, $default_value );
+	} else {
+		$cache_key = "$network_id:$option";
+		$value     = wp_cache_get( $cache_key, 'site-options' );
+
+		if ( ! isset( $value ) || false === $value ) {
+			$row = $wpdb->get_row( $wpdb->prepare( "SELECT meta_value FROM $wpdb->sitemeta WHERE meta_key = %s AND site_id = %d", $option, $network_id ) );
+
+			// Has to be get_row() instead of get_var() because of funkiness with 0, false, null values.
+			if ( is_object( $row ) ) {
+				$value = $row->meta_value;
+				$value = maybe_unserialize( $value );
+				wp_cache_set( $cache_key, $value, 'site-options' );
+			} else {
+				if ( ! is_array( $notoptions ) ) {
+					$notoptions = array();
+				}
+
+				$notoptions[ $option ] = true;
+				wp_cache_set( $notoptions_key, $notoptions, 'site-options' );
+
+				/** This filter is documented in wp-includes/option.php */
+				$value = apply_filters( 'default_site_option_' . $option, $default_value, $option, $network_id );
+			}
+		}
+	}
+
+	if ( ! is_array( $notoptions ) ) {
+		$notoptions = array();
+		wp_cache_set( $notoptions_key, $notoptions, 'site-options' );
+	}
+
+	/**
+	 * Filters the value of an existing network option.
+	 *
+	 * The dynamic portion of the hook name, `$option`, refers to the option name.
+	 *
+	 * @since 2.9.0 As 'site_option_' . $key
+	 * @since 3.0.0
+	 * @since 4.4.0 The `$option` parameter was added.
+	 * @since 4.7.0 The `$network_id` parameter was added.
+	 *
+	 * @param mixed  $value      Value of network option.
+	 * @param string $option     Option name.
+	 * @param int    $network_id ID of the network.
+	 */
+	return apply_filters( "site_option_{$option}", $value, $option, $network_id );
+}
+
+/**
+ * Adds a new network option.
+ *
+ * Existing options will not be updated.
+ *
+ * @since 4.4.0
+ *
+ * @see add_option()
+ *
+ * @global wpdb $wpdb WordPress database abstraction object.
+ *
+ * @param int    $network_id ID of the network. Can be null to default to the current network ID.
+ * @param string $option     Name of the option to add. Expected to not be SQL-escaped.
+ * @param mixed  $value      Option value, can be anything. Expected to not be SQL-escaped.
+ * @return bool True if the option was added, false otherwise.
+ */
+function add_network_option( $network_id, $option, $value ) {
+	global $wpdb;
+
+	if ( $network_id && ! is_numeric( $network_id ) ) {
+		return false;
+	}
+
+	$network_id = (int) $network_id;
+
+	// Fallback to the current network if a network ID is not specified.
+	if ( ! $network_id ) {
+		$network_id = get_current_network_id();
+	}
+
+	wp_protect_special_option( $option );
+
+	/**
+	 * Filters the value of a specific network option before it is added.
+	 *
+	 * The dynamic portion of the hook name, `$option`, refers to the option name.
+	 *
+	 * @since 2.9.0 As 'pre_add_site_option_' . $key
+	 * @since 3.0.0
+	 * @since 4.4.0 The `$option` parameter was added.
+	 * @since 4.7.0 The `$network_id` parameter was added.
+	 *
+	 * @param mixed  $value      Value of network option.
+	 * @param string $option     Option name.
+	 * @param int    $network_id ID of the network.
+	 */
+	$value = apply_filters( "pre_add_site_option_{$option}", $value, $option, $network_id );
+
+	$notoptions_key = "$network_id:notoptions";
+
+	if ( ! is_multisite() ) {
+		$result = add_option( $option, $value, '', 'no' );
+	} else {
+		$cache_key = "$network_id:$option";
+
+		/*
+		 * Make sure the option doesn't already exist.
+		 * We can check the 'notoptions' cache before we ask for a DB query.
+		 */
+		$notoptions = wp_cache_get( $notoptions_key, 'site-options' );
+
+		if ( ! is_array( $notoptions ) || ! isset( $notoptions[ $option ] ) ) {
+			if ( false !== get_network_option( $network_id, $option, false ) ) {
+				return false;
+			}
+		}
+
+		$value = sanitize_option( $option, $value );
+
+		$serialized_value = maybe_serialize( $value );
+		$result           = $wpdb->insert(
+			$wpdb->sitemeta,
+			array(
+				'site_id'    => $network_id,
+				'meta_key'   => $option,
+				'meta_value' => $serialized_value,
+			)
+		);
+
+		if ( ! $result ) {
+			return false;
+		}
+
+		wp_cache_set( $cache_key, $value, 'site-options' );
+
+		// This option exists now.
+		$notoptions = wp_cache_get( $notoptions_key, 'site-options' ); // Yes, again... we need it to be fresh.
+
+		if ( is_array( $notoptions ) && isset( $notoptions[ $option ] ) ) {
+			unset( $notoptions[ $option ] );
+			wp_cache_set( $notoptions_key, $notoptions, 'site-options' );
+		}
+	}
+
+	if ( $result ) {
+
+		/**
+		 * Fires after a specific network option has been successfully added.
+		 *
+		 * The dynamic portion of the hook name, `$option`, refers to the option name.
+		 *
+		 * @since 2.9.0 As "add_site_option_{$key}"
+		 * @since 3.0.0
+		 * @since 4.7.0 The `$network_id` parameter was added.
+		 *
+		 * @param string $option     Name of the network option.
+		 * @param mixed  $value      Value of the network option.
+		 * @param int    $network_id ID of the network.
+		 */
+		do_action( "add_site_option_{$option}", $option, $value, $network_id );
+
+		/**
+		 * Fires after a network option has been successfully added.
+		 *
+		 * @since 3.0.0
+		 * @since 4.7.0 The `$network_id` parameter was added.
+		 *
+		 * @param string $option     Name of the network option.
+		 * @param mixed  $value      Value of the network option.
+		 * @param int    $network_id ID of the network.
+		 */
+		do_action( 'add_site_option', $option, $value, $network_id );
+
+		return true;
+	}
+
+	return false;
+}
+
+/**
+ * Removes a network option by name.
+ *
+ * @since 4.4.0
+ *
+ * @see delete_option()
+ *
+ * @global wpdb $wpdb WordPress database abstraction object.
+ *
+ * @param int    $network_id ID of the network. Can be null to default to the current network ID.
+ * @param string $option     Name of the option to delete. Expected to not be SQL-escaped.
+ * @return bool True if the option was deleted, false otherwise.
+ */
+function delete_network_option( $network_id, $option ) {
+	global $wpdb;
+
+	if ( $network_id && ! is_numeric( $network_id ) ) {
+		return false;
+	}
+
+	$network_id = (int) $network_id;
+
+	// Fallback to the current network if a network ID is not specified.
+	if ( ! $network_id ) {
+		$network_id = get_current_network_id();
+	}
+
+	/**
+	 * Fires immediately before a specific network option is deleted.
+	 *
+	 * The dynamic portion of the hook name, `$option`, refers to the option name.
+	 *
+	 * @since 3.0.0
+	 * @since 4.4.0 The `$option` parameter was added.
+	 * @since 4.7.0 The `$network_id` parameter was added.
+	 *
+	 * @param string $option     Option name.
+	 * @param int    $network_id ID of the network.
+	 */
+	do_action( "pre_delete_site_option_{$option}", $option, $network_id );
+
+	if ( ! is_multisite() ) {
+		$result = delete_option( $option );
+	} else {
+		$row = $wpdb->get_row( $wpdb->prepare( "SELECT meta_id FROM {$wpdb->sitemeta} WHERE meta_key = %s AND site_id = %d", $option, $network_id ) );
+		if ( is_null( $row ) || ! $row->meta_id ) {
+			return false;
+		}
+		$cache_key = "$network_id:$option";
+		wp_cache_delete( $cache_key, 'site-options' );
+
+		$result = $wpdb->delete(
+			$wpdb->sitemeta,
+			array(
+				'meta_key' => $option,
+				'site_id'  => $network_id,
+			)
+		);
+	}
+
+	if ( $result ) {
+
+		/**
+		 * Fires after a specific network option has been deleted.
+		 *
+		 * The dynamic portion of the hook name, `$option`, refers to the option name.
+		 *
+		 * @since 2.9.0 As "delete_site_option_{$key}"
+		 * @since 3.0.0
+		 * @since 4.7.0 The `$network_id` parameter was added.
+		 *
+		 * @param string $option     Name of the network option.
+		 * @param int    $network_id ID of the network.
+		 */
+		do_action( "delete_site_option_{$option}", $option, $network_id );
+
+		/**
+		 * Fires after a network option has been deleted.
+		 *
+		 * @since 3.0.0
+		 * @since 4.7.0 The `$network_id` parameter was added.
+		 *
+		 * @param string $option     Name of the network option.
+		 * @param int    $network_id ID of the network.
+		 */
+		do_action( 'delete_site_option', $option, $network_id );
+
+		return true;
+	}
+
+	return false;
+}
+
+/**
+ * Updates the value of a network option that was already added.
+ *
+ * @since 4.4.0
+ *
+ * @see update_option()
+ *
+ * @global wpdb $wpdb WordPress database abstraction object.
+ *
+ * @param int    $network_id ID of the network. Can be null to default to the current network ID.
+ * @param string $option     Name of the option. Expected to not be SQL-escaped.
+ * @param mixed  $value      Option value. Expected to not be SQL-escaped.
+ * @return bool True if the value was updated, false otherwise.
+ */
+function update_network_option( $network_id, $option, $value ) {
+	global $wpdb;
+
+	if ( $network_id && ! is_numeric( $network_id ) ) {
+		return false;
+	}
+
+	$network_id = (int) $network_id;
+
+	// Fallback to the current network if a network ID is not specified.
+	if ( ! $network_id ) {
+		$network_id = get_current_network_id();
+	}
+
+	wp_protect_special_option( $option );
+
+	$old_value = get_network_option( $network_id, $option );
+
+	/**
+	 * Filters a specific network option before its value is updated.
+	 *
+	 * The dynamic portion of the hook name, `$option`, refers to the option name.
+	 *
+	 * @since 2.9.0 As 'pre_update_site_option_' . $key
+	 * @since 3.0.0
+	 * @since 4.4.0 The `$option` parameter was added.
+	 * @since 4.7.0 The `$network_id` parameter was added.
+	 *
+	 * @param mixed  $value      New value of the network option.
+	 * @param mixed  $old_value  Old value of the network option.
+	 * @param string $option     Option name.
+	 * @param int    $network_id ID of the network.
+	 */
+	$value = apply_filters( "pre_update_site_option_{$option}", $value, $old_value, $option, $network_id );
+
+	/*
+	 * If the new and old values are the same, no need to update.
+	 *
+	 * Unserialized values will be adequate in most cases. If the unserialized
+	 * data differs, the (maybe) serialized data is checked to avoid
+	 * unnecessary database calls for otherwise identical object instances.
+	 *
+	 * See https://core.trac.wordpress.org/ticket/44956
+	 */
+	if ( $value === $old_value || maybe_serialize( $value ) === maybe_serialize( $old_value ) ) {
+		return false;
+	}
+
+	if ( false === $old_value ) {
+		return add_network_option( $network_id, $option, $value );
+	}
+
+	$notoptions_key = "$network_id:notoptions";
+	$notoptions     = wp_cache_get( $notoptions_key, 'site-options' );
+
+	if ( is_array( $notoptions ) && isset( $notoptions[ $option ] ) ) {
+		unset( $notoptions[ $option ] );
+		wp_cache_set( $notoptions_key, $notoptions, 'site-options' );
+	}
+
+	if ( ! is_multisite() ) {
+		$result = update_option( $option, $value, 'no' );
+	} else {
+		$value = sanitize_option( $option, $value );
+
+		$serialized_value = maybe_serialize( $value );
+		$result           = $wpdb->update(
+			$wpdb->sitemeta,
+			array( 'meta_value' => $serialized_value ),
+			array(
+				'site_id'  => $network_id,
+				'meta_key' => $option,
+			)
+		);
+
+		if ( $result ) {
+			$cache_key = "$network_id:$option";
+			wp_cache_set( $cache_key, $value, 'site-options' );
+		}
+	}
+
+	if ( $result ) {
+
+		/**
+		 * Fires after the value of a specific network option has been successfully updated.
+		 *
+		 * The dynamic portion of the hook name, `$option`, refers to the option name.
+		 *
+		 * @since 2.9.0 As "update_site_option_{$key}"
+		 * @since 3.0.0
+		 * @since 4.7.0 The `$network_id` parameter was added.
+		 *
+		 * @param string $option     Name of the network option.
+		 * @param mixed  $value      Current value of the network option.
+		 * @param mixed  $old_value  Old value of the network option.
+		 * @param int    $network_id ID of the network.
+		 */
+		do_action( "update_site_option_{$option}", $option, $value, $old_value, $network_id );
+
+		/**
+		 * Fires after the value of a network option has been successfully updated.
+		 *
+		 * @since 3.0.0
+		 * @since 4.7.0 The `$network_id` parameter was added.
+		 *
+		 * @param string $option     Name of the network option.
+		 * @param mixed  $value      Current value of the network option.
+		 * @param mixed  $old_value  Old value of the network option.
+		 * @param int    $network_id ID of the network.
+		 */
+		do_action( 'update_site_option', $option, $value, $old_value, $network_id );
+
+		return true;
+	}
+
+	return false;
+}
+
+/**
+ * Deletes a site transient.
+ *
+ * @since 2.9.0
+ *
+ * @param string $transient Transient name. Expected to not be SQL-escaped.
+ * @return bool True if the transient was deleted, false otherwise.
+ */
+function delete_site_transient( $transient ) {
+
+	/**
+	 * Fires immediately before a specific site transient is deleted.
+	 *
+	 * The dynamic portion of the hook name, `$transient`, refers to the transient name.
+	 *
+	 * @since 3.0.0
+	 *
+	 * @param string $transient Transient name.
+	 */
+	do_action( "delete_site_transient_{$transient}", $transient );
+
+	if ( wp_using_ext_object_cache() || wp_installing() ) {
+		$result = wp_cache_delete( $transient, 'site-transient' );
+	} else {
+		$option_timeout = '_site_transient_timeout_' . $transient;
+		$option         = '_site_transient_' . $transient;
+		$result         = delete_site_option( $option );
+
+		if ( $result ) {
+			delete_site_option( $option_timeout );
+		}
+	}
+
+	if ( $result ) {
+
+		/**
+		 * Fires after a transient is deleted.
+		 *
+		 * @since 3.0.0
+		 *
+		 * @param string $transient Deleted transient name.
+		 */
+		do_action( 'deleted_site_transient', $transient );
+	}
+
+	return $result;
+}
+
+/**
+ * Retrieves the value of a site transient.
+ *
+ * If the transient does not exist, does not have a value, or has expired,
+ * then the return value will be false.
+ *
+ * @since 2.9.0
+ *
+ * @see get_transient()
+ *
+ * @param string $transient Transient name. Expected to not be SQL-escaped.
+ * @return mixed Value of transient.
+ */
+function get_site_transient( $transient ) {
+
+	/**
+	 * Filters the value of an existing site transient before it is retrieved.
+	 *
+	 * The dynamic portion of the hook name, `$transient`, refers to the transient name.
+	 *
+	 * Returning a value other than boolean false will short-circuit retrieval and
+	 * return that value instead.
+	 *
+	 * @since 2.9.0
+	 * @since 4.4.0 The `$transient` parameter was added.
+	 *
+	 * @param mixed  $pre_site_transient The default value to return if the site transient does not exist.
+	 *                                   Any value other than false will short-circuit the retrieval
+	 *                                   of the transient, and return that value.
+	 * @param string $transient          Transient name.
+	 */
+	$pre = apply_filters( "pre_site_transient_{$transient}", false, $transient );
+
+	if ( false !== $pre ) {
+		return $pre;
+	}
+
+	if ( wp_using_ext_object_cache() || wp_installing() ) {
+		$value = wp_cache_get( $transient, 'site-transient' );
+	} else {
+		// Core transients that do not have a timeout. Listed here so querying timeouts can be avoided.
+		$no_timeout       = array( 'update_core', 'update_plugins', 'update_themes' );
+		$transient_option = '_site_transient_' . $transient;
+		if ( ! in_array( $transient, $no_timeout, true ) ) {
+			$transient_timeout = '_site_transient_timeout_' . $transient;
+			$timeout           = get_site_option( $transient_timeout );
+			if ( false !== $timeout && $timeout < time() ) {
+				delete_site_option( $transient_option );
+				delete_site_option( $transient_timeout );
+				$value = false;
+			}
+		}
+
+		if ( ! isset( $value ) ) {
+			$value = get_site_option( $transient_option );
+		}
+	}
+
+	/**
+	 * Filters the value of an existing site transient.
+	 *
+	 * The dynamic portion of the hook name, `$transient`, refers to the transient name.
+	 *
+	 * @since 2.9.0
+	 * @since 4.4.0 The `$transient` parameter was added.
+	 *
+	 * @param mixed  $value     Value of site transient.
+	 * @param string $transient Transient name.
+	 */
+	return apply_filters( "site_transient_{$transient}", $value, $transient );
+}
+
+/**
+ * Sets/updates the value of a site transient.
+ *
+ * You do not need to serialize values. If the value needs to be serialized,
+ * then it will be serialized before it is set.
+ *
+ * @since 2.9.0
+ *
+ * @see set_transient()
+ *
+ * @param string $transient  Transient name. Expected to not be SQL-escaped. Must be
+ *                           167 characters or fewer in length.
+ * @param mixed  $value      Transient value. Expected to not be SQL-escaped.
+ * @param int    $expiration Optional. Time until expiration in seconds. Default 0 (no expiration).
+ * @return bool True if the value was set, false otherwise.
+ */
+function set_site_transient( $transient, $value, $expiration = 0 ) {
+
+	/**
+	 * Filters the value of a specific site transient before it is set.
+	 *
+	 * The dynamic portion of the hook name, `$transient`, refers to the transient name.
+	 *
+	 * @since 3.0.0
+	 * @since 4.4.0 The `$transient` parameter was added.
+	 *
+	 * @param mixed  $value     New value of site transient.
+	 * @param string $transient Transient name.
+	 */
+	$value = apply_filters( "pre_set_site_transient_{$transient}", $value, $transient );
+
+	$expiration = (int) $expiration;
+
+	/**
+	 * Filters the expiration for a site transient before its value is set.
+	 *
+	 * The dynamic portion of the hook name, `$transient`, refers to the transient name.
+	 *
+	 * @since 4.4.0
+	 *
+	 * @param int    $expiration Time until expiration in seconds. Use 0 for no expiration.
+	 * @param mixed  $value      New value of site transient.
+	 * @param string $transient  Transient name.
+	 */
+	$expiration = apply_filters( "expiration_of_site_transient_{$transient}", $expiration, $value, $transient );
+
+	if ( wp_using_ext_object_cache() || wp_installing() ) {
+		$result = wp_cache_set( $transient, $value, 'site-transient', $expiration );
+	} else {
+		$transient_timeout = '_site_transient_timeout_' . $transient;
+		$option            = '_site_transient_' . $transient;
+
+		if ( false === get_site_option( $option ) ) {
+			if ( $expiration ) {
+				add_site_option( $transient_timeout, time() + $expiration );
+			}
+			$result = add_site_option( $option, $value );
+		} else {
+			if ( $expiration ) {
+				update_site_option( $transient_timeout, time() + $expiration );
+			}
+			$result = update_site_option( $option, $value );
+		}
+	}
+
+	if ( $result ) {
+
+		/**
+		 * Fires after the value for a specific site transient has been set.
+		 *
+		 * The dynamic portion of the hook name, `$transient`, refers to the transient name.
+		 *
+		 * @since 3.0.0
+		 * @since 4.4.0 The `$transient` parameter was added
+		 *
+		 * @param mixed  $value      Site transient value.
+		 * @param int    $expiration Time until expiration in seconds.
+		 * @param string $transient  Transient name.
+		 */
+		do_action( "set_site_transient_{$transient}", $value, $expiration, $transient );
+
+		/**
+		 * Fires after the value for a site transient has been set.
+		 *
+		 * @since 3.0.0
+		 *
+		 * @param string $transient  The name of the site transient.
+		 * @param mixed  $value      Site transient value.
+		 * @param int    $expiration Time until expiration in seconds.
+		 */
+		do_action( 'setted_site_transient', $transient, $value, $expiration );
+	}
+
+	return $result;
+}
+
+/**
+ * Registers default settings available in WordPress.
+ *
+ * The settings registered here are primarily useful for the REST API, so this
+ * does not encompass all settings available in WordPress.
+ *
+ * @since 4.7.0
+ * @since 6.0.1 The `show_on_front`, `page_on_front`, and `page_for_posts` options were added.
+ */
+function register_initial_settings() {
+	register_setting(
+		'general',
+		'blogname',
+		array(
+			'show_in_rest' => array(
+				'name' => 'title',
+			),
+			'type'         => 'string',
+			'description'  => __( 'Site title.' ),
+		)
+	);
+
+	register_setting(
+		'general',
+		'blogdescription',
+		array(
+			'show_in_rest' => array(
+				'name' => 'description',
+			),
+			'type'         => 'string',
+			'description'  => __( 'Site tagline.' ),
+		)
+	);
+
+	if ( ! is_multisite() ) {
+		register_setting(
+			'general',
+			'siteurl',
+			array(
+				'show_in_rest' => array(
+					'name'   => 'url',
+					'schema' => array(
+						'format' => 'uri',
+					),
+				),
+				'type'         => 'string',
+				'description'  => __( 'Site URL.' ),
+			)
+		);
+	}
+
+	if ( ! is_multisite() ) {
+		register_setting(
+			'general',
+			'admin_email',
+			array(
+				'show_in_rest' => array(
+					'name'   => 'email',
+					'schema' => array(
+						'format' => 'email',
+					),
+				),
+				'type'         => 'string',
+				'description'  => __( 'This address is used for admin purposes, like new user notification.' ),
+			)
+		);
+	}
+
+	register_setting(
+		'general',
+		'timezone_string',
+		array(
+			'show_in_rest' => array(
+				'name' => 'timezone',
+			),
+			'type'         => 'string',
+			'description'  => __( 'A city in the same timezone as you.' ),
+		)
+	);
+
+	register_setting(
+		'general',
+		'date_format',
+		array(
+			'show_in_rest' => true,
+			'type'         => 'string',
+			'description'  => __( 'A date format for all date strings.' ),
+		)
+	);
+
+	register_setting(
+		'general',
+		'time_format',
+		array(
+			'show_in_rest' => true,
+			'type'         => 'string',
+			'description'  => __( 'A time format for all time strings.' ),
+		)
+	);
+
+	register_setting(
+		'general',
+		'start_of_week',
+		array(
+			'show_in_rest' => true,
+			'type'         => 'integer',
+			'description'  => __( 'A day number of the week that the week should start on.' ),
+		)
+	);
+
+	register_setting(
+		'general',
+		'WPLANG',
+		array(
+			'show_in_rest' => array(
+				'name' => 'language',
+			),
+			'type'         => 'string',
+			'description'  => __( 'WordPress locale code.' ),
+			'default'      => 'en_US',
+		)
+	);
+
+	register_setting(
+		'writing',
+		'use_smilies',
+		array(
+			'show_in_rest' => true,
+			'type'         => 'boolean',
+			'description'  => __( 'Convert emoticons like :-) and :-P to graphics on display.' ),
+			'default'      => true,
+		)
+	);
+
+	register_setting(
+		'writing',
+		'default_category',
+		array(
+			'show_in_rest' => true,
+			'type'         => 'integer',
+			'description'  => __( 'Default post category.' ),
+		)
+	);
+
+	register_setting(
+		'writing',
+		'default_post_format',
+		array(
+			'show_in_rest' => true,
+			'type'         => 'string',
+			'description'  => __( 'Default post format.' ),
+		)
+	);
+
+	register_setting(
+		'reading',
+		'posts_per_page',
+		array(
+			'show_in_rest' => true,
+			'type'         => 'integer',
+			'description'  => __( 'Blog pages show at most.' ),
+			'default'      => 10,
+		)
+	);
+
+	register_setting(
+		'reading',
+		'show_on_front',
+		array(
+			'show_in_rest' => true,
+			'type'         => 'string',
+			'description'  => __( 'What to show on the front page' ),
+		)
+	);
+
+	register_setting(
+		'reading',
+		'page_on_front',
+		array(
+			'show_in_rest' => true,
+			'type'         => 'integer',
+			'description'  => __( 'The ID of the page that should be displayed on the front page' ),
+		)
+	);
+
+	register_setting(
+		'reading',
+		'page_for_posts',
+		array(
+			'show_in_rest' => true,
+			'type'         => 'integer',
+			'description'  => __( 'The ID of the page that should display the latest posts' ),
+		)
+	);
+
+	register_setting(
+		'discussion',
+		'default_ping_status',
+		array(
+			'show_in_rest' => array(
+				'schema' => array(
+					'enum' => array( 'open', 'closed' ),
+				),
+			),
+			'type'         => 'string',
+			'description'  => __( 'Allow link notifications from other blogs (pingbacks and trackbacks) on new articles.' ),
+		)
+	);
+
+	register_setting(
+		'discussion',
+		'default_comment_status',
+		array(
+			'show_in_rest' => array(
+				'schema' => array(
+					'enum' => array( 'open', 'closed' ),
+				),
+			),
+			'type'         => 'string',
+			'description'  => __( 'Allow people to submit comments on new posts.' ),
+		)
+	);
+}
+
+/**
+ * Registers a setting and its data.
+ *
+ * @since 2.7.0
+ * @since 3.0.0 The `misc` option group was deprecated.
+ * @since 3.5.0 The `privacy` option group was deprecated.
+ * @since 4.7.0 `$args` can be passed to set flags on the setting, similar to `register_meta()`.
+ * @since 5.5.0 `$new_whitelist_options` was renamed to `$new_allowed_options`.
+ *              Please consider writing more inclusive code.
+ *
+ * @global array $new_allowed_options
+ * @global array $wp_registered_settings
+ *
+ * @param string $option_group A settings group name. Should correspond to an allowed option key name.
+ *                             Default allowed option key names include 'general', 'discussion', 'media',
+ *                             'reading', 'writing', and 'options'.
+ * @param string $option_name The name of an option to sanitize and save.
+ * @param array  $args {
+ *     Data used to describe the setting when registered.
+ *
+ *     @type string     $type              The type of data associated with this setting.
+ *                                         Valid values are 'string', 'boolean', 'integer', 'number', 'array', and 'object'.
+ *     @type string     $description       A description of the data attached to this setting.
+ *     @type callable   $sanitize_callback A callback function that sanitizes the option's value.
+ *     @type bool|array $show_in_rest      Whether data associated with this setting should be included in the REST API.
+ *                                         When registering complex settings, this argument may optionally be an
+ *                                         array with a 'schema' key.
+ *     @type mixed      $default           Default value when calling `get_option()`.
+ * }
+ */
+function register_setting( $option_group, $option_name, $args = array() ) {
+	global $new_allowed_options, $wp_registered_settings;
+
+	/*
+	 * In 5.5.0, the `$new_whitelist_options` global variable was renamed to `$new_allowed_options`.
+	 * Please consider writing more inclusive code.
+	 */
+	$GLOBALS['new_whitelist_options'] = &$new_allowed_options;
+
+	$defaults = array(
+		'type'              => 'string',
+		'group'             => $option_group,
+		'description'       => '',
+		'sanitize_callback' => null,
+		'show_in_rest'      => false,
+	);
+
+	// Back-compat: old sanitize callback is added.
+	if ( is_callable( $args ) ) {
+		$args = array(
+			'sanitize_callback' => $args,
+		);
+	}
+
+	/**
+	 * Filters the registration arguments when registering a setting.
+	 *
+	 * @since 4.7.0
+	 *
+	 * @param array  $args         Array of setting registration arguments.
+	 * @param array  $defaults     Array of default arguments.
+	 * @param string $option_group Setting group.
+	 * @param string $option_name  Setting name.
+	 */
+	$args = apply_filters( 'register_setting_args', $args, $defaults, $option_group, $option_name );
+
+	$args = wp_parse_args( $args, $defaults );
+
+	// Require an item schema when registering settings with an array type.
+	if ( false !== $args['show_in_rest'] && 'array' === $args['type'] && ( ! is_array( $args['show_in_rest'] ) || ! isset( $args['show_in_rest']['schema']['items'] ) ) ) {
+		_doing_it_wrong( __FUNCTION__, __( 'When registering an "array" setting to show in the REST API, you must specify the schema for each array item in "show_in_rest.schema.items".' ), '5.4.0' );
+	}
+
+	if ( ! is_array( $wp_registered_settings ) ) {
+		$wp_registered_settings = array();
+	}
+
+	if ( 'misc' === $option_group ) {
+		_deprecated_argument(
+			__FUNCTION__,
+			'3.0.0',
+			sprintf(
+				/* translators: %s: misc */
+				__( 'The "%s" options group has been removed. Use another settings group.' ),
+				'misc'
+			)
+		);
+		$option_group = 'general';
+	}
+
+	if ( 'privacy' === $option_group ) {
+		_deprecated_argument(
+			__FUNCTION__,
+			'3.5.0',
+			sprintf(
+				/* translators: %s: privacy */
+				__( 'The "%s" options group has been removed. Use another settings group.' ),
+				'privacy'
+			)
+		);
+		$option_group = 'reading';
+	}
+
+	$new_allowed_options[ $option_group ][] = $option_name;
+
+	if ( ! empty( $args['sanitize_callback'] ) ) {
+		add_filter( "sanitize_option_{$option_name}", $args['sanitize_callback'] );
+	}
+	if ( array_key_exists( 'default', $args ) ) {
+		add_filter( "default_option_{$option_name}", 'filter_default_option', 10, 3 );
+	}
+
+	/**
+	 * Fires immediately before the setting is registered but after its filters are in place.
+	 *
+	 * @since 5.5.0
+	 *
+	 * @param string $option_group Setting group.
+	 * @param string $option_name  Setting name.
+	 * @param array  $args         Array of setting registration arguments.
+	 */
+	do_action( 'register_setting', $option_group, $option_name, $args );
+
+	$wp_registered_settings[ $option_name ] = $args;
+}
+
+/**
+ * Unregisters a setting.
+ *
+ * @since 2.7.0
+ * @since 4.7.0 `$sanitize_callback` was deprecated. The callback from `register_setting()` is now used instead.
+ * @since 5.5.0 `$new_whitelist_options` was renamed to `$new_allowed_options`.
+ *              Please consider writing more inclusive code.
+ *
+ * @global array $new_allowed_options
+ * @global array $wp_registered_settings
+ *
+ * @param string   $option_group The settings group name used during registration.
+ * @param string   $option_name  The name of the option to unregister.
+ * @param callable $deprecated   Optional. Deprecated.
+ */
+function unregister_setting( $option_group, $option_name, $deprecated = '' ) {
+	global $new_allowed_options, $wp_registered_settings;
+
+	/*
+	 * In 5.5.0, the `$new_whitelist_options` global variable was renamed to `$new_allowed_options`.
+	 * Please consider writing more inclusive code.
+	 */
+	$GLOBALS['new_whitelist_options'] = &$new_allowed_options;
+
+	if ( 'misc' === $option_group ) {
+		_deprecated_argument(
+			__FUNCTION__,
+			'3.0.0',
+			sprintf(
+				/* translators: %s: misc */
+				__( 'The "%s" options group has been removed. Use another settings group.' ),
+				'misc'
+			)
+		);
+		$option_group = 'general';
+	}
+
+	if ( 'privacy' === $option_group ) {
+		_deprecated_argument(
+			__FUNCTION__,
+			'3.5.0',
+			sprintf(
+				/* translators: %s: privacy */
+				__( 'The "%s" options group has been removed. Use another settings group.' ),
+				'privacy'
+			)
+		);
+		$option_group = 'reading';
+	}
+
+	$pos = false;
+	if ( isset( $new_allowed_options[ $option_group ] ) ) {
+		$pos = array_search( $option_name, (array) $new_allowed_options[ $option_group ], true );
+	}
+
+	if ( false !== $pos ) {
+		unset( $new_allowed_options[ $option_group ][ $pos ] );
+	}
+
+	if ( '' !== $deprecated ) {
+		_deprecated_argument(
+			__FUNCTION__,
+			'4.7.0',
+			sprintf(
+				/* translators: 1: $sanitize_callback, 2: register_setting() */
+				__( '%1$s is deprecated. The callback from %2$s is used instead.' ),
+				'<code>$sanitize_callback</code>',
+				'<code>register_setting()</code>'
+			)
+		);
+		remove_filter( "sanitize_option_{$option_name}", $deprecated );
+	}
+
+	if ( isset( $wp_registered_settings[ $option_name ] ) ) {
+		// Remove the sanitize callback if one was set during registration.
+		if ( ! empty( $wp_registered_settings[ $option_name ]['sanitize_callback'] ) ) {
+			remove_filter( "sanitize_option_{$option_name}", $wp_registered_settings[ $option_name ]['sanitize_callback'] );
+		}
+
+		// Remove the default filter if a default was provided during registration.
+		if ( array_key_exists( 'default', $wp_registered_settings[ $option_name ] ) ) {
+			remove_filter( "default_option_{$option_name}", 'filter_default_option', 10 );
+		}
+
+		/**
+		 * Fires immediately before the setting is unregistered and after its filters have been removed.
+		 *
+		 * @since 5.5.0
+		 *
+		 * @param string $option_group Setting group.
+		 * @param string $option_name  Setting name.
+		 */
+		do_action( 'unregister_setting', $option_group, $option_name );
+
+		unset( $wp_registered_settings[ $option_name ] );
+	}
+}
+
+/**
+ * Retrieves an array of registered settings.
+ *
+ * @since 4.7.0
+ *
+ * @global array $wp_registered_settings
+ *
+ * @return array List of registered settings, keyed by option name.
+ */
+function get_registered_settings() {
+	global $wp_registered_settings;
+
+	if ( ! is_array( $wp_registered_settings ) ) {
+		return array();
+	}
+
+	return $wp_registered_settings;
+}
+
+/**
+ * Filters the default value for the option.
+ *
+ * For settings which register a default setting in `register_setting()`, this
+ * function is added as a filter to `default_option_{$option}`.
+ *
+ * @since 4.7.0
+ *
+ * @param mixed  $default_value  Existing default value to return.
+ * @param string $option         Option name.
+ * @param bool   $passed_default Was `get_option()` passed a default value?
+ * @return mixed Filtered default value.
+ */
+function filter_default_option( $default_value, $option, $passed_default ) {
+	if ( $passed_default ) {
+		return $default_value;
+	}
+
+	$registered = get_registered_settings();
+	if ( empty( $registered[ $option ] ) ) {
+		return $default_value;
+	}
+
+	return $registered[ $option ]['default'];
+}