* @link https://developer.wordpress.org/reference/classes/wp_object_cache/
/** WP_Object_Cache class */
require_once ABSPATH . WPINC . '/class-wp-object-cache.php';
* Sets up Object Cache Global and assigns it.
* @global WP_Object_Cache $wp_object_cache
function wp_cache_init() {
$GLOBALS['wp_object_cache'] = new WP_Object_Cache();
* Adds data to the cache, if the cache key doesn't already exist.
* @see WP_Object_Cache::add()
* @global WP_Object_Cache $wp_object_cache Object cache global instance.
* @param int|string $key The cache key to use for retrieval later.
* @param mixed $data The data to add to the cache.
* @param string $group Optional. The group to add the cache to. Enables the same key
* to be used across groups. Default empty.
* @param int $expire Optional. When the cache data should expire, in seconds.
* Default 0 (no expiration).
* @return bool True on success, false if cache key and group already exist.
function wp_cache_add( $key, $data, $group = '', $expire = 0 ) {
return $wp_object_cache->add( $key, $data, $group, (int) $expire );
* Adds multiple values to the cache in one call.
* @see WP_Object_Cache::add_multiple()
* @global WP_Object_Cache $wp_object_cache Object cache global instance.
* @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 if cache key and group already exist.
function wp_cache_add_multiple( array $data, $group = '', $expire = 0 ) {
return $wp_object_cache->add_multiple( $data, $group, (int) $expire );
* Replaces the contents of the cache with new data.
* @see WP_Object_Cache::replace()
* @global WP_Object_Cache $wp_object_cache Object cache global instance.
* @param int|string $key The key for the cache data that should be replaced.
* @param mixed $data The new data to store in the cache.
* @param string $group Optional. The group for the cache data that should be replaced.
* @param int $expire Optional. When to expire the cache contents, in seconds.
* Default 0 (no expiration).
* @return bool True if contents were replaced, false if original value does not exist.
function wp_cache_replace( $key, $data, $group = '', $expire = 0 ) {
return $wp_object_cache->replace( $key, $data, $group, (int) $expire );
* Saves the data to the cache.
* Differs from wp_cache_add() and wp_cache_replace() in that it will always write data.
* @see WP_Object_Cache::set()
* @global WP_Object_Cache $wp_object_cache Object cache global instance.
* @param int|string $key The cache key to use for retrieval later.
* @param mixed $data The contents to store in the cache.
* @param string $group Optional. Where to group the cache contents. Enables the same key
* to be used across groups. Default empty.
* @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( $key, $data, $group = '', $expire = 0 ) {
return $wp_object_cache->set( $key, $data, $group, (int) $expire );
* Sets multiple values to the cache in one call.
* @see WP_Object_Cache::set_multiple()
* @global WP_Object_Cache $wp_object_cache Object cache global instance.
* @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 ) {
return $wp_object_cache->set_multiple( $data, $group, (int) $expire );
* Retrieves the cache contents from the cache by key and group.
* @see WP_Object_Cache::get()
* @global WP_Object_Cache $wp_object_cache Object cache global instance.
* @param int|string $key The key 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.
* @param bool|null $found Optional. Whether the key was found in the cache (passed by reference).
* Disambiguates a return of false, a storable value. Default null.
* @return mixed|false The cache contents on success, false on failure to retrieve contents.
function wp_cache_get( $key, $group = '', $force = false, &$found = null ) {
return $wp_object_cache->get( $key, $group, $force, $found );
* Retrieves multiple values from the cache in one call.
* @see WP_Object_Cache::get_multiple()
* @global WP_Object_Cache $wp_object_cache Object cache global instance.
* @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 ) {
return $wp_object_cache->get_multiple( $keys, $group, $force );
* Removes the cache contents matching key and group.
* @see WP_Object_Cache::delete()
* @global WP_Object_Cache $wp_object_cache Object cache global instance.
* @param int|string $key What the contents in the cache are called.
* @param string $group Optional. Where the cache contents are grouped. Default empty.
* @return bool True on successful removal, false on failure.
function wp_cache_delete( $key, $group = '' ) {
return $wp_object_cache->delete( $key, $group );
* Deletes multiple values from the cache in one call.
* @see WP_Object_Cache::delete_multiple()
* @global WP_Object_Cache $wp_object_cache Object cache global instance.
* @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 = '' ) {
return $wp_object_cache->delete_multiple( $keys, $group );
* Increments numeric cache item's value.
* @see WP_Object_Cache::incr()
* @global WP_Object_Cache $wp_object_cache Object cache global instance.
* @param int|string $key The key for the cache contents that should be incremented.
* @param int $offset Optional. The amount by which to increment the item's value.
* @param string $group Optional. The group the key is in. Default empty.
* @return int|false The item's new value on success, false on failure.
function wp_cache_incr( $key, $offset = 1, $group = '' ) {
return $wp_object_cache->incr( $key, $offset, $group );
* Decrements numeric cache item's value.
* @see WP_Object_Cache::decr()
* @global WP_Object_Cache $wp_object_cache Object cache global instance.
* @param int|string $key The cache key to decrement.
* @param int $offset Optional. The amount by which to decrement the item's value.
* @param string $group Optional. The group the key is in. Default empty.
* @return int|false The item's new value on success, false on failure.
function wp_cache_decr( $key, $offset = 1, $group = '' ) {
return $wp_object_cache->decr( $key, $offset, $group );
* Removes all cache items.
* @see WP_Object_Cache::flush()
* @global WP_Object_Cache $wp_object_cache Object cache global instance.
* @return bool True on success, false on failure.
function wp_cache_flush() {
return $wp_object_cache->flush();
* Removes all cache items from the in-memory runtime cache.
* @see WP_Object_Cache::flush()
* @return bool True on success, false on failure.
function wp_cache_flush_runtime() {
* 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.
* @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 ) {
return $wp_object_cache->flush_group( $group );
* Determines whether the object cache implementation supports a particular feature.
* @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 ) {
* This function has ceased to do anything since WordPress 2.5. The
* functionality was removed along with the rest of the persistent cache.
* This does not mean that plugins can't implement this function when they need
* to make sure that the cache is cleaned up after WordPress no longer needs it.
* @return true Always returns true.
function wp_cache_close() {
* Adds a group or set of groups to the list of global groups.
* @see WP_Object_Cache::add_global_groups()
* @global WP_Object_Cache $wp_object_cache Object cache global instance.
* @param string|string[] $groups A group or an array of groups to add.
function wp_cache_add_global_groups( $groups ) {
$wp_object_cache->add_global_groups( $groups );
* Adds a group or set of groups to the list of non-persistent groups.
* @param string|string[] $groups A group or an array of groups to add.
function wp_cache_add_non_persistent_groups( $groups ) {
// Default cache doesn't persist so nothing to do here.
* Switches the internal blog ID.
* This changes the blog id used to create keys in blog specific groups.
* @see WP_Object_Cache::switch_to_blog()
* @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 ) {
$wp_object_cache->switch_to_blog( $blog_id );
* Resets internal cache keys and structures.
* If the cache back end uses global blog or site IDs as part of its cache keys,
* this function instructs the back end to reset those keys and perform any cleanup
* since blog or site IDs have changed since cache init.
* This function is deprecated. Use wp_cache_switch_to_blog() instead of this
* function when preparing the cache for a blog switch. For clearing the cache
* during unit tests, consider using wp_cache_init(). wp_cache_init() is not
* recommended outside of unit tests as the performance penalty for using it is high.
* @deprecated 3.5.0 Use wp_cache_switch_to_blog()
* @see WP_Object_Cache::reset()
* @global WP_Object_Cache $wp_object_cache Object cache global instance.
function wp_cache_reset() {
_deprecated_function( __FUNCTION__, '3.5.0', 'wp_cache_switch_to_blog()' );
$wp_object_cache->reset();
It is recommended that you Edit text format, this type of Fix handles quite a lot in one request
