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<?php
/**
* Object Cache API functions missing from 3rd party object caches.
*
* @link https://developer.wordpress.org/reference/classes/wp_object_cache/
*
* @package WordPress
* @subpackage Cache
*/
if ( ! function_exists( 'wp_cache_add_multiple' ) ) :
/**
* Adds multiple values to the cache in one call, if the cache keys don't already exist.
*
* Compat function to mimic wp_cache_add_multiple().
*
* @ignore
* @since 6.0.0
*
* @see wp_cache_add_multiple()
*
* @param array $data Array of keys and values to be added.
* @param string $group Optional. Where the cache contents are grouped. Default empty.
* @param int $expire Optional. When to expire the cache contents, in seconds.
* Default 0 (no expiration).
* @return bool[] Array of return values, grouped by key. Each value is either
* true on success, or false if cache key and group already exist.
*/
function wp_cache_add_multiple( array $data, $group = '', $expire = 0 ) {
$values = array();
foreach ( $data as $key => $value ) {
$values[ $key ] = wp_cache_add( $key, $value, $group, $expire );
}
return $values;
}
endif;
if ( ! function_exists( 'wp_cache_set_multiple' ) ) :
/**
* Sets multiple values to the cache in one call.
*
* Differs from wp_cache_add_multiple() in that it will always write data.
*
* Compat function to mimic wp_cache_set_multiple().
*
* @ignore
* @since 6.0.0
*
* @see wp_cache_set_multiple()
*
* @param array $data Array of keys and values to be set.
* @param string $group Optional. Where the cache contents are grouped. Default empty.
* @param int $expire Optional. When to expire the cache contents, in seconds.
* Default 0 (no expiration).
* @return bool[] Array of return values, grouped by key. Each value is either
* true on success, or false on failure.
*/
function wp_cache_set_multiple( array $data, $group = '', $expire = 0 ) {
$values = array();
foreach ( $data as $key => $value ) {
$values[ $key ] = wp_cache_set( $key, $value, $group, $expire );
}
return $values;
}
endif;
if ( ! function_exists( 'wp_cache_get_multiple' ) ) :
/**
* Retrieves multiple values from the cache in one call.
*
* Compat function to mimic wp_cache_get_multiple().
*
* @ignore
* @since 5.5.0
*
* @see wp_cache_get_multiple()
*
* @param array $keys Array of keys under which the cache contents are stored.
* @param string $group Optional. Where the cache contents are grouped. Default empty.
* @param bool $force Optional. Whether to force an update of the local cache
* from the persistent cache. Default false.
* @return array Array of return values, grouped by key. Each value is either
* the cache contents on success, or false on failure.
*/
function wp_cache_get_multiple( $keys, $group = '', $force = false ) {
$values = array();
foreach ( $keys as $key ) {
$values[ $key ] = wp_cache_get( $key, $group, $force );
}
return $values;
}
endif;
if ( ! function_exists( 'wp_cache_delete_multiple' ) ) :
/**
* Deletes multiple values from the cache in one call.
*
* Compat function to mimic wp_cache_delete_multiple().
*
* @ignore
* @since 6.0.0
*
* @see wp_cache_delete_multiple()
*
* @param array $keys Array of keys under which the cache to deleted.
* @param string $group Optional. Where the cache contents are grouped. Default empty.
* @return bool[] Array of return values, grouped by key. Each value is either
* true on success, or false if the contents were not deleted.
*/
function wp_cache_delete_multiple( array $keys, $group = '' ) {
$values = array();
foreach ( $keys as $key ) {
$values[ $key ] = wp_cache_delete( $key, $group );
}
return $values;
}
endif;
if ( ! function_exists( 'wp_cache_flush_runtime' ) ) :
/**
* Removes all cache items from the in-memory runtime cache.
*
* Compat function to mimic wp_cache_flush_runtime().
*
* @ignore
* @since 6.0.0
*
* @see wp_cache_flush_runtime()
*
* @return bool True on success, false on failure.
*/
function wp_cache_flush_runtime() {
if ( ! wp_cache_supports( 'flush_runtime' ) ) {
_doing_it_wrong(
__FUNCTION__,
__( 'Your object cache implementation does not support flushing the in-memory runtime cache.' ),
'6.1.0'
);
return false;
}
return wp_cache_flush();
}
endif;
if ( ! function_exists( 'wp_cache_flush_group' ) ) :
/**
* Removes all cache items in a group, if the object cache implementation supports it.
*
* Before calling this function, always check for group flushing support using the
* `wp_cache_supports( 'flush_group' )` function.
*
* @since 6.1.0
*
* @see WP_Object_Cache::flush_group()
* @global WP_Object_Cache $wp_object_cache Object cache global instance.
*
* @param string $group Name of group to remove from cache.
* @return bool True if group was flushed, false otherwise.
*/
function wp_cache_flush_group( $group ) {
global $wp_object_cache;
if ( ! wp_cache_supports( 'flush_group' ) ) {
_doing_it_wrong(
__FUNCTION__,
__( 'Your object cache implementation does not support flushing individual groups.' ),
'6.1.0'
);
return false;
}
return $wp_object_cache->flush_group( $group );
}
endif;
if ( ! function_exists( 'wp_cache_supports' ) ) :
/**
* Determines whether the object cache implementation supports a particular feature.
*
* @since 6.1.0
*
* @param string $feature Name of the feature to check for. Possible values include:
* 'add_multiple', 'set_multiple', 'get_multiple', 'delete_multiple',
* 'flush_runtime', 'flush_group'.
* @return bool True if the feature is supported, false otherwise.
*/
function wp_cache_supports( $feature ) {
return false;
}
endif;
if ( ! function_exists( 'wp_cache_get_salted' ) ) :
/**
* Retrieves cached data if valid and unchanged.
*
* @since 6.9.0
*
* @param string $cache_key The cache key used for storage and retrieval.
* @param string $group The cache group used for organizing data.
* @param string|string[] $salt The timestamp (or multiple timestamps if an array) indicating when the cache group(s) were last updated.
* @return mixed|false The cached data if valid, or false if the cache does not exist or is outdated.
*/
function wp_cache_get_salted( $cache_key, $group, $salt ) {
$salt = is_array( $salt ) ? implode( ':', $salt ) : $salt;
$cache = wp_cache_get( $cache_key, $group );
if ( ! is_array( $cache ) ) {
return false;
}
if ( ! isset( $cache['salt'] ) || ! isset( $cache['data'] ) || $salt !== $cache['salt'] ) {
return false;
}
return $cache['data'];
}
endif;
if ( ! function_exists( 'wp_cache_set_salted' ) ) :
/**
* Stores salted data in the cache.
*
* @since 6.9.0
*
* @param string $cache_key The cache key under which to store the data.
* @param mixed $data The data to be cached.
* @param string $group The cache group to which the data belongs.
* @param string|string[] $salt The timestamp (or multiple timestamps if an array) indicating when the cache group(s) were last updated.
* @param int $expire Optional. When to expire the cache contents, in seconds.
* Default 0 (no expiration).
* @return bool True on success, false on failure.
*/
function wp_cache_set_salted( $cache_key, $data, $group, $salt, $expire = 0 ) {
$salt = is_array( $salt ) ? implode( ':', $salt ) : $salt;
return wp_cache_set(
$cache_key,
array(
'data' => $data,
'salt' => $salt,
),
$group,
$expire
);
}
endif;
if ( ! function_exists( 'wp_cache_get_multiple_salted' ) ) :
/**
* Retrieves multiple items from the cache, only considering valid and unchanged items.
*
* @since 6.9.0
*
* @param array $cache_keys Array of cache keys to retrieve.
* @param string $group The group of the cache to check.
* @param string|string[] $salt The timestamp (or multiple timestamps if an array) indicating when the cache group(s) were last updated.
* @return array An associative array containing cache values. Values are `false` if they are not found or outdated.
*/
function wp_cache_get_multiple_salted( $cache_keys, $group, $salt ) {
$salt = is_array( $salt ) ? implode( ':', $salt ) : $salt;
$cache = wp_cache_get_multiple( $cache_keys, $group );
foreach ( $cache as $key => $value ) {
if ( ! is_array( $value ) ) {
$cache[ $key ] = false;
continue;
}
if ( ! isset( $value['salt'], $value['data'] ) || $salt !== $value['salt'] ) {
$cache[ $key ] = false;
continue;
}
$cache[ $key ] = $value['data'];
}
return $cache;
}
endif;
if ( ! function_exists( 'wp_cache_set_multiple_salted' ) ) :
/**
* Stores multiple pieces of salted data in the cache.
*
* @since 6.9.0
*
* @param mixed $data Data to be stored in the cache for all keys.
* @param string $group Group to which the cached data belongs.
* @param string|string[] $salt The timestamp (or multiple timestamps if an array) indicating when the cache group(s) were last updated.
* @param int $expire Optional. When to expire the cache contents, in seconds.
* Default 0 (no expiration).
* @return bool[] Array of return values, grouped by key. Each value is either
* true on success, or false on failure.
*/
function wp_cache_set_multiple_salted( $data, $group, $salt, $expire = 0 ) {
$salt = is_array( $salt ) ? implode( ':', $salt ) : $salt;
$new_cache = array();
foreach ( $data as $key => $value ) {
$new_cache[ $key ] = array(
'data' => $value,
'salt' => $salt,
);
}
return wp_cache_set_multiple( $new_cache, $group, $expire );
}
endif;
if ( ! function_exists( 'wp_cache_switch_to_blog' ) ) :
/**
* Used when switch_to_blog() and restore_current_blog() are called, but
* only when a persistent object cache drop-in plugin has omitted the
* wp_cache_switch_to_blog() function that was introduced in 3.5.0.
*
* @link https://core.trac.wordpress.org/ticket/23290
*
* @since 7.0.0
*
* @global WP_Object_Cache $wp_object_cache Object cache global instance.
*
* @param int $blog_id Site ID.
*/
function wp_cache_switch_to_blog( $blog_id ): void {
global $wp_object_cache;
// Attempt to use the drop-in object cache method if it exists.
if ( is_object( $wp_object_cache ) && method_exists( $wp_object_cache, 'switch_to_blog' ) ) {
$wp_object_cache->switch_to_blog( $blog_id );
return;
}
/*
* Perform a fallback blog switch, which will reinitialize the caches
* for the new blog ID.
*/
wp_cache_switch_to_blog_fallback();
}
endif;