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732 lines
21 KiB
732 lines
21 KiB
<?php |
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/** |
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* Object Cache API |
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* |
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* @link https://codex.wordpress.org/Class_Reference/WP_Object_Cache |
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* |
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* @package WordPress |
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* @subpackage Cache |
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*/ |
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|
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/** |
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* Adds data to the cache, if the cache key doesn't already exist. |
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* |
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* @since 2.0.0 |
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* |
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* @see WP_Object_Cache::add() |
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* @global WP_Object_Cache $wp_object_cache Object cache global instance. |
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* |
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* @param int|string $key The cache key to use for retrieval later. |
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* @param mixed $data The data to add to the cache. |
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* @param string $group Optional. The group to add the cache to. Enables the same key |
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* to be used across groups. Default empty. |
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* @param int $expire Optional. When the cache data should expire, in seconds. |
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* Default 0 (no expiration). |
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* @return bool False if cache key and group already exist, true on success. |
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*/ |
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function wp_cache_add( $key, $data, $group = '', $expire = 0 ) { |
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global $wp_object_cache; |
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return $wp_object_cache->add( $key, $data, $group, (int) $expire ); |
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} |
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/** |
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* Closes the cache. |
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* |
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* This function has ceased to do anything since WordPress 2.5. The |
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* functionality was removed along with the rest of the persistent cache. |
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* |
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* This does not mean that plugins can't implement this function when they need |
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* to make sure that the cache is cleaned up after WordPress no longer needs it. |
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* |
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* @since 2.0.0 |
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* |
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* @return true Always returns true. |
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*/ |
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function wp_cache_close() { |
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return true; |
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} |
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/** |
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* Decrements numeric cache item's value. |
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* |
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* @since 3.3.0 |
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* |
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* @see WP_Object_Cache::decr() |
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* @global WP_Object_Cache $wp_object_cache Object cache global instance. |
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* |
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* @param int|string $key The cache key to decrement. |
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* @param int $offset Optional. The amount by which to decrement the item's value. Default 1. |
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* @param string $group Optional. The group the key is in. Default empty. |
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* @return false|int False on failure, the item's new value on success. |
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*/ |
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function wp_cache_decr( $key, $offset = 1, $group = '' ) { |
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global $wp_object_cache; |
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return $wp_object_cache->decr( $key, $offset, $group ); |
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} |
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/** |
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* Removes the cache contents matching key and group. |
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* |
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* @since 2.0.0 |
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* |
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* @see WP_Object_Cache::delete() |
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* @global WP_Object_Cache $wp_object_cache Object cache global instance. |
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* |
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* @param int|string $key What the contents in the cache are called. |
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* @param string $group Optional. Where the cache contents are grouped. Default empty. |
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* @return bool True on successful removal, false on failure. |
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*/ |
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function wp_cache_delete( $key, $group = '' ) { |
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global $wp_object_cache; |
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return $wp_object_cache->delete($key, $group); |
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} |
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/** |
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* Removes all cache items. |
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* |
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* @since 2.0.0 |
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* |
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* @see WP_Object_Cache::flush() |
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* @global WP_Object_Cache $wp_object_cache Object cache global instance. |
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* |
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* @return bool False on failure, true on success |
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*/ |
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function wp_cache_flush() { |
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global $wp_object_cache; |
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return $wp_object_cache->flush(); |
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} |
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/** |
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* Retrieves the cache contents from the cache by key and group. |
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* |
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* @since 2.0.0 |
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* |
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* @see WP_Object_Cache::get() |
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* @global WP_Object_Cache $wp_object_cache Object cache global instance. |
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* |
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* @param int|string $key The key under which the cache contents are stored. |
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* @param string $group Optional. Where the cache contents are grouped. Default empty. |
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* @param bool $force Optional. Whether to force an update of the local cache from the persistent |
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* cache. Default false. |
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* @param bool $found Optional. Whether the key was found in the cache (passed by reference). |
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* Disambiguates a return of false, a storable value. Default null. |
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* @return bool|mixed False on failure to retrieve contents or the cache |
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* contents on success |
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*/ |
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function wp_cache_get( $key, $group = '', $force = false, &$found = null ) { |
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global $wp_object_cache; |
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return $wp_object_cache->get( $key, $group, $force, $found ); |
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} |
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/** |
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* Increment numeric cache item's value |
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* |
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* @since 3.3.0 |
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* |
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* @see WP_Object_Cache::incr() |
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* @global WP_Object_Cache $wp_object_cache Object cache global instance. |
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* |
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* @param int|string $key The key for the cache contents that should be incremented. |
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* @param int $offset Optional. The amount by which to increment the item's value. Default 1. |
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* @param string $group Optional. The group the key is in. Default empty. |
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* @return false|int False on failure, the item's new value on success. |
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*/ |
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function wp_cache_incr( $key, $offset = 1, $group = '' ) { |
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global $wp_object_cache; |
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return $wp_object_cache->incr( $key, $offset, $group ); |
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} |
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/** |
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* Sets up Object Cache Global and assigns it. |
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* |
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* @since 2.0.0 |
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* |
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* @global WP_Object_Cache $wp_object_cache |
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*/ |
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function wp_cache_init() { |
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$GLOBALS['wp_object_cache'] = new WP_Object_Cache(); |
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} |
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/** |
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* Replaces the contents of the cache with new data. |
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* |
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* @since 2.0.0 |
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* |
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* @see WP_Object_Cache::replace() |
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* @global WP_Object_Cache $wp_object_cache Object cache global instance. |
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* |
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* @param int|string $key The key for the cache data that should be replaced. |
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* @param mixed $data The new data to store in the cache. |
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* @param string $group Optional. The group for the cache data that should be replaced. |
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* Default empty. |
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* @param int $expire Optional. When to expire the cache contents, in seconds. |
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* Default 0 (no expiration). |
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* @return bool False if original value does not exist, true if contents were replaced |
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*/ |
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function wp_cache_replace( $key, $data, $group = '', $expire = 0 ) { |
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global $wp_object_cache; |
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return $wp_object_cache->replace( $key, $data, $group, (int) $expire ); |
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} |
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/** |
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* Saves the data to the cache. |
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* |
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* Differs from wp_cache_add() and wp_cache_replace() in that it will always write data. |
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* |
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* @since 2.0.0 |
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* |
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* @see WP_Object_Cache::set() |
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* @global WP_Object_Cache $wp_object_cache Object cache global instance. |
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* |
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* @param int|string $key The cache key to use for retrieval later. |
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* @param mixed $data The contents to store in the cache. |
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* @param string $group Optional. Where to group the cache contents. Enables the same key |
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* to be used across groups. Default empty. |
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* @param int $expire Optional. When to expire the cache contents, in seconds. |
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* Default 0 (no expiration). |
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* @return bool False on failure, true on success |
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*/ |
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function wp_cache_set( $key, $data, $group = '', $expire = 0 ) { |
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global $wp_object_cache; |
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return $wp_object_cache->set( $key, $data, $group, (int) $expire ); |
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} |
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/** |
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* Switches the internal blog ID. |
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* |
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* This changes the blog id used to create keys in blog specific groups. |
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* |
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* @since 3.5.0 |
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* |
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* @see WP_Object_Cache::switch_to_blog() |
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* @global WP_Object_Cache $wp_object_cache Object cache global instance. |
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* |
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* @param int $blog_id Site ID. |
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*/ |
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function wp_cache_switch_to_blog( $blog_id ) { |
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global $wp_object_cache; |
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$wp_object_cache->switch_to_blog( $blog_id ); |
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} |
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/** |
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* Adds a group or set of groups to the list of global groups. |
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* |
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* @since 2.6.0 |
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* |
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* @see WP_Object_Cache::add_global_groups() |
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* @global WP_Object_Cache $wp_object_cache Object cache global instance. |
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* |
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* @param string|array $groups A group or an array of groups to add. |
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*/ |
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function wp_cache_add_global_groups( $groups ) { |
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global $wp_object_cache; |
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$wp_object_cache->add_global_groups( $groups ); |
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} |
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/** |
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* Adds a group or set of groups to the list of non-persistent groups. |
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* |
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* @since 2.6.0 |
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* |
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* @param string|array $groups A group or an array of groups to add. |
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*/ |
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function wp_cache_add_non_persistent_groups( $groups ) { |
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// Default cache doesn't persist so nothing to do here. |
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} |
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/** |
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* Reset internal cache keys and structures. |
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* |
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* If the cache back end uses global blog or site IDs as part of its cache keys, |
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* this function instructs the back end to reset those keys and perform any cleanup |
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* since blog or site IDs have changed since cache init. |
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* |
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* This function is deprecated. Use wp_cache_switch_to_blog() instead of this |
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* function when preparing the cache for a blog switch. For clearing the cache |
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* during unit tests, consider using wp_cache_init(). wp_cache_init() is not |
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* recommended outside of unit tests as the performance penalty for using it is |
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* high. |
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* |
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* @since 2.6.0 |
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* @deprecated 3.5.0 WP_Object_Cache::reset() |
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* @see WP_Object_Cache::reset() |
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* |
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* @global WP_Object_Cache $wp_object_cache Object cache global instance. |
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*/ |
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function wp_cache_reset() { |
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_deprecated_function( __FUNCTION__, '3.5.0', 'WP_Object_Cache::reset()' ); |
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global $wp_object_cache; |
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$wp_object_cache->reset(); |
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} |
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/** |
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* Core class that implements an object cache. |
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* |
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* The WordPress Object Cache is used to save on trips to the database. The |
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* Object Cache stores all of the cache data to memory and makes the cache |
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* contents available by using a key, which is used to name and later retrieve |
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* the cache contents. |
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* |
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* The Object Cache can be replaced by other caching mechanisms by placing files |
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* in the wp-content folder which is looked at in wp-settings. If that file |
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* exists, then this file will not be included. |
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* |
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* @since 2.0.0 |
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*/ |
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class WP_Object_Cache { |
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/** |
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* Holds the cached objects. |
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* |
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* @since 2.0.0 |
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* @var array |
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*/ |
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private $cache = array(); |
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/** |
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* The amount of times the cache data was already stored in the cache. |
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* |
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* @since 2.5.0 |
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* @var int |
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*/ |
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public $cache_hits = 0; |
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/** |
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* Amount of times the cache did not have the request in cache. |
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* |
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* @since 2.0.0 |
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* @var int |
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*/ |
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public $cache_misses = 0; |
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/** |
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* List of global cache groups. |
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* |
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* @since 3.0.0 |
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* @var array |
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*/ |
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protected $global_groups = array(); |
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/** |
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* The blog prefix to prepend to keys in non-global groups. |
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* |
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* @since 3.5.0 |
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* @var int |
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*/ |
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private $blog_prefix; |
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/** |
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* Holds the value of is_multisite(). |
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* |
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* @since 3.5.0 |
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* @var bool |
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*/ |
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private $multisite; |
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/** |
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* Makes private properties readable for backward compatibility. |
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* |
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* @since 4.0.0 |
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* |
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* @param string $name Property to get. |
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* @return mixed Property. |
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*/ |
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public function __get( $name ) { |
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return $this->$name; |
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} |
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/** |
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* Makes private properties settable for backward compatibility. |
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* |
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* @since 4.0.0 |
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* |
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* @param string $name Property to set. |
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* @param mixed $value Property value. |
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* @return mixed Newly-set property. |
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*/ |
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public function __set( $name, $value ) { |
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return $this->$name = $value; |
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} |
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/** |
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* Makes private properties checkable for backward compatibility. |
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* |
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* @since 4.0.0 |
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* |
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* @param string $name Property to check if set. |
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* @return bool Whether the property is set. |
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*/ |
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public function __isset( $name ) { |
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return isset( $this->$name ); |
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} |
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/** |
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* Makes private properties un-settable for backward compatibility. |
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* |
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* @since 4.0.0 |
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* |
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* @param string $name Property to unset. |
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*/ |
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public function __unset( $name ) { |
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unset( $this->$name ); |
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} |
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/** |
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* Adds data to the cache if it doesn't already exist. |
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* |
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* @since 2.0.0 |
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* |
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* @uses WP_Object_Cache::_exists() Checks to see if the cache already has data. |
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* @uses WP_Object_Cache::set() Sets the data after the checking the cache |
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* contents existence. |
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* |
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* @param int|string $key What to call the contents in the cache. |
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* @param mixed $data The contents to store in the cache. |
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* @param string $group Optional. Where to group the cache contents. Default 'default'. |
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* @param int $expire Optional. When to expire the cache contents. Default 0 (no expiration). |
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* @return bool False if cache key and group already exist, true on success |
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*/ |
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public function add( $key, $data, $group = 'default', $expire = 0 ) { |
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if ( wp_suspend_cache_addition() ) |
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return false; |
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if ( empty( $group ) ) |
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$group = 'default'; |
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$id = $key; |
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if ( $this->multisite && ! isset( $this->global_groups[ $group ] ) ) |
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$id = $this->blog_prefix . $key; |
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if ( $this->_exists( $id, $group ) ) |
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return false; |
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return $this->set( $key, $data, $group, (int) $expire ); |
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} |
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/** |
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* Sets the list of global cache groups. |
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* |
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* @since 3.0.0 |
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* |
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* @param array $groups List of groups that are global. |
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*/ |
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public function add_global_groups( $groups ) { |
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$groups = (array) $groups; |
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$groups = array_fill_keys( $groups, true ); |
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$this->global_groups = array_merge( $this->global_groups, $groups ); |
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} |
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/** |
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* Decrements numeric cache item's value. |
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* |
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* @since 3.3.0 |
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* |
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* @param int|string $key The cache key to decrement. |
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* @param int $offset Optional. The amount by which to decrement the item's value. Default 1. |
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* @param string $group Optional. The group the key is in. Default 'default'. |
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* @return false|int False on failure, the item's new value on success. |
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*/ |
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public function decr( $key, $offset = 1, $group = 'default' ) { |
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if ( empty( $group ) ) |
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$group = 'default'; |
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if ( $this->multisite && ! isset( $this->global_groups[ $group ] ) ) |
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$key = $this->blog_prefix . $key; |
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if ( ! $this->_exists( $key, $group ) ) |
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return false; |
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if ( ! is_numeric( $this->cache[ $group ][ $key ] ) ) |
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$this->cache[ $group ][ $key ] = 0; |
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$offset = (int) $offset; |
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$this->cache[ $group ][ $key ] -= $offset; |
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if ( $this->cache[ $group ][ $key ] < 0 ) |
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$this->cache[ $group ][ $key ] = 0; |
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return $this->cache[ $group ][ $key ]; |
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} |
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/** |
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* Removes the contents of the cache key in the group. |
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* |
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* If the cache key does not exist in the group, then nothing will happen. |
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* |
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* @since 2.0.0 |
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* |
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* @param int|string $key What the contents in the cache are called. |
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* @param string $group Optional. Where the cache contents are grouped. Default 'default'. |
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* @param bool $deprecated Optional. Unused. Default false. |
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* @return bool False if the contents weren't deleted and true on success. |
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*/ |
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public function delete( $key, $group = 'default', $deprecated = false ) { |
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if ( empty( $group ) ) |
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$group = 'default'; |
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if ( $this->multisite && ! isset( $this->global_groups[ $group ] ) ) |
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$key = $this->blog_prefix . $key; |
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if ( ! $this->_exists( $key, $group ) ) |
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return false; |
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unset( $this->cache[$group][$key] ); |
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return true; |
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} |
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/** |
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* Clears the object cache of all data. |
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* |
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* @since 2.0.0 |
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* |
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* @return true Always returns true. |
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*/ |
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public function flush() { |
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$this->cache = array(); |
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return true; |
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} |
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/** |
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* Retrieves the cache contents, if it exists. |
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* |
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* The contents will be first attempted to be retrieved by searching by the |
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* key in the cache group. If the cache is hit (success) then the contents |
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* are returned. |
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* |
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* On failure, the number of cache misses will be incremented. |
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* |
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* @since 2.0.0 |
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* |
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* @param int|string $key What the contents in the cache are called. |
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* @param string $group Optional. Where the cache contents are grouped. Default 'default'. |
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* @param string $force Optional. Unused. Whether to force a refetch rather than relying on the local |
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* cache. Default false. |
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* @param bool $found Optional. Whether the key was found in the cache (passed by reference). |
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* Disambiguates a return of false, a storable value. Default null. |
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* @return false|mixed False on failure to retrieve contents or the cache contents on success. |
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*/ |
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public function get( $key, $group = 'default', $force = false, &$found = null ) { |
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if ( empty( $group ) ) |
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$group = 'default'; |
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if ( $this->multisite && ! isset( $this->global_groups[ $group ] ) ) |
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$key = $this->blog_prefix . $key; |
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if ( $this->_exists( $key, $group ) ) { |
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$found = true; |
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$this->cache_hits += 1; |
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if ( is_object($this->cache[$group][$key]) ) |
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return clone $this->cache[$group][$key]; |
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else |
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return $this->cache[$group][$key]; |
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} |
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$found = false; |
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$this->cache_misses += 1; |
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return false; |
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} |
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|
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/** |
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* Increments numeric cache item's value. |
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* |
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* @since 3.3.0 |
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* |
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* @param int|string $key The cache key to increment |
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* @param int $offset Optional. The amount by which to increment the item's value. Default 1. |
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* @param string $group Optional. The group the key is in. Default 'default'. |
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* @return false|int False on failure, the item's new value on success. |
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*/ |
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public function incr( $key, $offset = 1, $group = 'default' ) { |
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if ( empty( $group ) ) |
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$group = 'default'; |
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if ( $this->multisite && ! isset( $this->global_groups[ $group ] ) ) |
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$key = $this->blog_prefix . $key; |
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if ( ! $this->_exists( $key, $group ) ) |
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return false; |
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if ( ! is_numeric( $this->cache[ $group ][ $key ] ) ) |
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$this->cache[ $group ][ $key ] = 0; |
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$offset = (int) $offset; |
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$this->cache[ $group ][ $key ] += $offset; |
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if ( $this->cache[ $group ][ $key ] < 0 ) |
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$this->cache[ $group ][ $key ] = 0; |
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return $this->cache[ $group ][ $key ]; |
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} |
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/** |
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* Replaces the contents in the cache, if contents already exist. |
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* |
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* @since 2.0.0 |
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* |
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* @see WP_Object_Cache::set() |
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* |
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* @param int|string $key What to call the contents in the cache. |
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* @param mixed $data The contents to store in the cache. |
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* @param string $group Optional. Where to group the cache contents. Default 'default'. |
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* @param int $expire Optional. When to expire the cache contents. Default 0 (no expiration). |
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* @return bool False if not exists, true if contents were replaced. |
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*/ |
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public function replace( $key, $data, $group = 'default', $expire = 0 ) { |
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if ( empty( $group ) ) |
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$group = 'default'; |
|
|
|
$id = $key; |
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if ( $this->multisite && ! isset( $this->global_groups[ $group ] ) ) |
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$id = $this->blog_prefix . $key; |
|
|
|
if ( ! $this->_exists( $id, $group ) ) |
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return false; |
|
|
|
return $this->set( $key, $data, $group, (int) $expire ); |
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} |
|
|
|
/** |
|
* Resets cache keys. |
|
* |
|
* @since 3.0.0 |
|
* |
|
* @deprecated 3.5.0 Use switch_to_blog() |
|
* @see switch_to_blog() |
|
*/ |
|
public function reset() { |
|
_deprecated_function( __FUNCTION__, '3.5.0', 'switch_to_blog()' ); |
|
|
|
// Clear out non-global caches since the blog ID has changed. |
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foreach ( array_keys( $this->cache ) as $group ) { |
|
if ( ! isset( $this->global_groups[ $group ] ) ) |
|
unset( $this->cache[ $group ] ); |
|
} |
|
} |
|
|
|
/** |
|
* Sets the data contents into the cache. |
|
* |
|
* The cache contents is grouped by the $group parameter followed by the |
|
* $key. This allows for duplicate ids in unique groups. Therefore, naming of |
|
* the group should be used with care and should follow normal function |
|
* naming guidelines outside of core WordPress usage. |
|
* |
|
* The $expire parameter is not used, because the cache will automatically |
|
* expire for each time a page is accessed and PHP finishes. The method is |
|
* more for cache plugins which use files. |
|
* |
|
* @since 2.0.0 |
|
* |
|
* @param int|string $key What to call the contents in the cache. |
|
* @param mixed $data The contents to store in the cache. |
|
* @param string $group Optional. Where to group the cache contents. Default 'default'. |
|
* @param int $expire Not Used. |
|
* @return true Always returns true. |
|
*/ |
|
public function set( $key, $data, $group = 'default', $expire = 0 ) { |
|
if ( empty( $group ) ) |
|
$group = 'default'; |
|
|
|
if ( $this->multisite && ! isset( $this->global_groups[ $group ] ) ) |
|
$key = $this->blog_prefix . $key; |
|
|
|
if ( is_object( $data ) ) |
|
$data = clone $data; |
|
|
|
$this->cache[$group][$key] = $data; |
|
return true; |
|
} |
|
|
|
/** |
|
* Echoes the stats of the caching. |
|
* |
|
* Gives the cache hits, and cache misses. Also prints every cached group, |
|
* key and the data. |
|
* |
|
* @since 2.0.0 |
|
*/ |
|
public function stats() { |
|
echo "<p>"; |
|
echo "<strong>Cache Hits:</strong> {$this->cache_hits}<br />"; |
|
echo "<strong>Cache Misses:</strong> {$this->cache_misses}<br />"; |
|
echo "</p>"; |
|
echo '<ul>'; |
|
foreach ($this->cache as $group => $cache) { |
|
echo "<li><strong>Group:</strong> $group - ( " . number_format( strlen( serialize( $cache ) ) / KB_IN_BYTES, 2 ) . 'k )</li>'; |
|
} |
|
echo '</ul>'; |
|
} |
|
|
|
/** |
|
* Switches the internal blog ID. |
|
* |
|
* This changes the blog ID used to create keys in blog specific groups. |
|
* |
|
* @since 3.5.0 |
|
* |
|
* @param int $blog_id Blog ID. |
|
*/ |
|
public function switch_to_blog( $blog_id ) { |
|
$blog_id = (int) $blog_id; |
|
$this->blog_prefix = $this->multisite ? $blog_id . ':' : ''; |
|
} |
|
|
|
/** |
|
* Serves as a utility function to determine whether a key exists in the cache. |
|
* |
|
* @since 3.4.0 |
|
* |
|
* @param int|string $key Cache key to check for existence. |
|
* @param string $group Cache group for the key existence check. |
|
* @return bool Whether the key exists in the cache for the given group. |
|
*/ |
|
protected function _exists( $key, $group ) { |
|
return isset( $this->cache[ $group ] ) && ( isset( $this->cache[ $group ][ $key ] ) || array_key_exists( $key, $this->cache[ $group ] ) ); |
|
} |
|
|
|
/** |
|
* Sets up object properties; PHP 5 style constructor. |
|
* |
|
* @since 2.0.8 |
|
*/ |
|
public function __construct() { |
|
$this->multisite = is_multisite(); |
|
$this->blog_prefix = $this->multisite ? get_current_blog_id() . ':' : ''; |
|
|
|
|
|
/** |
|
* @todo This should be moved to the PHP4 style constructor, PHP5 |
|
* already calls __destruct() |
|
*/ |
|
register_shutdown_function( array( $this, '__destruct' ) ); |
|
} |
|
|
|
/** |
|
* Saves the object cache before object is completely destroyed. |
|
* |
|
* Called upon object destruction, which should be when PHP ends. |
|
* |
|
* @since 2.0.8 |
|
* |
|
* @return true Always returns true. |
|
*/ |
|
public function __destruct() { |
|
return true; |
|
} |
|
}
|
|
|