X-Git-Url: https://scripts.mit.edu/gitweb/autoinstalls/wordpress.git/blobdiff_plain/5aa86a9053fb0fa15846bb60aac2fb8fdfff524a..073c5ed6408e2f00dc1863b463fe205467628905:/wp-includes/cache.php diff --git a/wp-includes/cache.php b/wp-includes/cache.php index f285be3a..6c53eabb 100644 --- a/wp-includes/cache.php +++ b/wp-includes/cache.php @@ -2,7 +2,7 @@ /** * Object Cache API * - * @link http://codex.wordpress.org/Function_Reference/WP_Cache + * @link https://codex.wordpress.org/Class_Reference/WP_Object_Cache * * @package WordPress * @subpackage Cache @@ -12,47 +12,52 @@ * Adds data to the cache, if the cache key doesn't already exist. * * @since 2.0.0 - * @uses $wp_object_cache Object Cache Class + * * @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 store - * @param string $group The group to add the cache to - * @param int $expire When the cache data should be expired - * @return unknown + * @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 $expire Optional. When the cache data should expire, in seconds. + * Default 0 (no expiration). + * @return bool False if cache key and group already exist, true on success. */ -function wp_cache_add($key, $data, $group = '', $expire = 0) { +function wp_cache_add( $key, $data, $group = '', $expire = 0 ) { global $wp_object_cache; - return $wp_object_cache->add($key, $data, $group, $expire); + return $wp_object_cache->add( $key, $data, $group, (int) $expire ); } /** * Closes the cache. * * 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. + * 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. * * @since 2.0.0 * - * @return bool Always returns True + * @return true Always returns true. */ function wp_cache_close() { return true; } /** - * Decrement numeric cache item's value + * Decrements numeric cache item's value. * * @since 3.3.0 - * @uses $wp_object_cache Object Cache Class + * * @see WP_Object_Cache::decr() + * @global WP_Object_Cache $wp_object_cache Object cache global instance. * - * @param int|string $key The cache key to increment - * @param int $offset The amount by which to decrement the item's value. Default is 1. - * @param string $group The group the key is in. + * @param int|string $key The cache key to decrement. + * @param int $offset Optional. The amount by which to decrement the item's value. Default 1. + * @param string $group Optional. The group the key is in. Default empty. * @return false|int False on failure, the item's new value on success. */ function wp_cache_decr( $key, $offset = 1, $group = '' ) { @@ -65,14 +70,15 @@ function wp_cache_decr( $key, $offset = 1, $group = '' ) { * Removes the cache contents matching key and group. * * @since 2.0.0 - * @uses $wp_object_cache Object Cache Class + * * @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 Where the cache contents are grouped - * @return bool True on successful removal, false on failure + * @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 = '') { +function wp_cache_delete( $key, $group = '' ) { global $wp_object_cache; return $wp_object_cache->delete($key, $group); @@ -82,10 +88,11 @@ function wp_cache_delete($key, $group = '') { * Removes all cache items. * * @since 2.0.0 - * @uses $wp_object_cache Object Cache Class + * * @see WP_Object_Cache::flush() + * @global WP_Object_Cache $wp_object_cache Object cache global instance. * - * @return bool Always returns true + * @return bool False on failure, true on success */ function wp_cache_flush() { global $wp_object_cache; @@ -97,31 +104,36 @@ function wp_cache_flush() { * Retrieves the cache contents from the cache by key and group. * * @since 2.0.0 - * @uses $wp_object_cache Object Cache Class + * * @see WP_Object_Cache::get() + * @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 Where the cache contents are grouped - * @param bool $force Whether to force an update of the local cache from the persistent cache (default is false) + * @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 $found Optional. Whether the key was found in the cache. Disambiguates a return of false, + * a storable value. Passed by reference. Default null. * @return bool|mixed False on failure to retrieve contents or the cache - * contents on success + * contents on success */ -function wp_cache_get( $key, $group = '', $force = false ) { +function wp_cache_get( $key, $group = '', $force = false, &$found = null ) { global $wp_object_cache; - return $wp_object_cache->get( $key, $group, $force ); + return $wp_object_cache->get( $key, $group, $force, $found ); } /** * Increment numeric cache item's value * * @since 3.3.0 - * @uses $wp_object_cache Object Cache Class + * * @see WP_Object_Cache::incr() + * @global WP_Object_Cache $wp_object_cache Object cache global instance. * - * @param int|string $key The cache key to increment - * @param int $offset The amount by which to increment the item's value. Default is 1. - * @param string $group The group the key is in. + * @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. Default 1. + * @param string $group Optional. The group the key is in. Default empty. * @return false|int False on failure, the item's new value on success. */ function wp_cache_incr( $key, $offset = 1, $group = '' ) { @@ -134,7 +146,8 @@ function wp_cache_incr( $key, $offset = 1, $group = '' ) { * Sets up Object Cache Global and assigns it. * * @since 2.0.0 - * @global WP_Object_Cache $wp_object_cache WordPress Object Cache + * + * @global WP_Object_Cache $wp_object_cache */ function wp_cache_init() { $GLOBALS['wp_object_cache'] = new WP_Object_Cache(); @@ -144,38 +157,64 @@ function wp_cache_init() { * Replaces the contents of the cache with new data. * * @since 2.0.0 - * @uses $wp_object_cache Object Cache Class + * * @see WP_Object_Cache::replace() + * @global WP_Object_Cache $wp_object_cache Object cache global instance. * - * @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 Where to group the cache contents - * @param int $expire When to expire the cache contents - * @return bool False if cache key and group already exist, true on success + * @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. + * Default empty. + * @param int $expire Optional. When to expire the cache contents, in seconds. + * Default 0 (no expiration). + * @return bool False if original value does not exist, true if contents were replaced */ -function wp_cache_replace($key, $data, $group = '', $expire = 0) { +function wp_cache_replace( $key, $data, $group = '', $expire = 0 ) { global $wp_object_cache; - return $wp_object_cache->replace($key, $data, $group, $expire); + return $wp_object_cache->replace( $key, $data, $group, (int) $expire ); } /** * Saves the data to the cache. * - * @since 2.0 - * @uses $wp_object_cache Object Cache Class + * Differs from wp_cache_add() and wp_cache_replace() in that it will always write data. + * + * @since 2.0.0 + * * @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 False on failure, true on success + */ +function wp_cache_set( $key, $data, $group = '', $expire = 0 ) { + global $wp_object_cache; + + return $wp_object_cache->set( $key, $data, $group, (int) $expire ); +} + +/** + * Switches the internal blog ID. + * + * This changes the blog id used to create keys in blog specific groups. * - * @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 Where to group the cache contents - * @param int $expire When to expire the cache contents - * @return bool False if cache key and group already exist, true on success + * @since 3.5.0 + * + * @see WP_Object_Cache::switch_to_blog() + * @global WP_Object_Cache $wp_object_cache Object cache global instance. + * + * @param int $blog_id Site ID. */ -function wp_cache_set($key, $data, $group = '', $expire = 0) { +function wp_cache_switch_to_blog( $blog_id ) { global $wp_object_cache; - return $wp_object_cache->set($key, $data, $group, $expire); + $wp_object_cache->switch_to_blog( $blog_id ); } /** @@ -183,12 +222,15 @@ function wp_cache_set($key, $data, $group = '', $expire = 0) { * * @since 2.6.0 * - * @param string|array $groups A group or an array of groups to add + * @see WP_Object_Cache::add_global_groups() + * @global WP_Object_Cache $wp_object_cache Object cache global instance. + * + * @param string|array $groups A group or an array of groups to add. */ function wp_cache_add_global_groups( $groups ) { global $wp_object_cache; - return $wp_object_cache->add_global_groups($groups); + $wp_object_cache->add_global_groups( $groups ); } /** @@ -196,27 +238,41 @@ function wp_cache_add_global_groups( $groups ) { * * @since 2.6.0 * - * @param string|array $groups A group or an array of groups to add + * @param string|array $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. - return; } /** - * Reset internal cache keys and structures. If the cache backend uses global blog or site IDs as part of its cache keys, - * this function instructs the backend to reset those keys and perform any cleanup since blog or site IDs have changed since cache init. + * Reset 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 penality for using it is + * high. * * @since 2.6.0 + * @deprecated 3.5.0 WP_Object_Cache::reset() + * @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' ); + global $wp_object_cache; - return $wp_object_cache->reset(); + $wp_object_cache->reset(); } /** - * WordPress Object Cache + * Core class that implements an object cache. * * The WordPress Object Cache is used to save on trips to the database. The * Object Cache stores all of the cache data to memory and makes the cache @@ -229,18 +285,18 @@ function wp_cache_reset() { * * @package WordPress * @subpackage Cache - * @since 2.0 + * @since 2.0.0 */ class WP_Object_Cache { /** - * Holds the cached objects + * Holds the cached objects. * - * @var array - * @access private * @since 2.0.0 + * @access private + * @var array */ - var $cache = array (); + private $cache = array(); /** * The amount of times the cache data was already stored in the cache. @@ -249,80 +305,163 @@ class WP_Object_Cache { * @access private * @var int */ - var $cache_hits = 0; + private $cache_hits = 0; /** - * Amount of times the cache did not have the request in cache + * Amount of times the cache did not have the request in cache. * - * @var int - * @access public * @since 2.0.0 + * @access public + * @var int */ - var $cache_misses = 0; + public $cache_misses = 0; /** - * List of global groups + * List of global cache groups. * - * @var array - * @access protected * @since 3.0.0 + * @access protected + * @var array */ - var $global_groups = array(); + protected $global_groups = array(); /** - * Adds data to the cache if it doesn't already exist. + * The blog prefix to prepend to keys in non-global groups. * - * @uses WP_Object_Cache::get Checks to see if the cache already has data. - * @uses WP_Object_Cache::set Sets the data after the checking the cache - * contents existence. + * @since 3.5.0 + * @access private + * @var int + */ + private $blog_prefix; + + /** + * Holds the value of is_multisite(). + * + * @since 3.5.0 + * @access private + * @var bool + */ + private $multisite; + + /** + * Makes private properties readable for backward compatibility. + * + * @since 4.0.0 + * @access public + * + * @param string $name Property to get. + * @return mixed Property. + */ + public function __get( $name ) { + return $this->$name; + } + + /** + * Makes private properties settable for backward compatibility. + * + * @since 4.0.0 + * @access public + * + * @param string $name Property to set. + * @param mixed $value Property value. + * @return mixed Newly-set property. + */ + public function __set( $name, $value ) { + return $this->$name = $value; + } + + /** + * Makes private properties checkable for backward compatibility. + * + * @since 4.0.0 + * @access public + * + * @param string $name Property to check if set. + * @return bool Whether the property is set. + */ + public function __isset( $name ) { + return isset( $this->$name ); + } + + /** + * Makes private properties un-settable for backward compatibility. + * + * @since 4.0.0 + * @access public + * + * @param string $name Property to unset. + */ + public function __unset( $name ) { + unset( $this->$name ); + } + + /** + * Adds data to the cache if it doesn't already exist. * * @since 2.0.0 + * @access public * - * @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 Where to group the cache contents - * @param int $expire When to expire the cache contents + * @uses WP_Object_Cache::_exists() Checks to see if the cache already has data. + * @uses WP_Object_Cache::set() Sets the data after the checking the cache + * contents existence. + * + * @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 Optional. When to expire the cache contents. Default 0 (no expiration). * @return bool False if cache key and group already exist, true on success */ - function add( $key, $data, $group = 'default', $expire = '' ) { + public function add( $key, $data, $group = 'default', $expire = 0 ) { if ( wp_suspend_cache_addition() ) return false; - if ( empty ($group) ) + if ( empty( $group ) ) $group = 'default'; - if (false !== $this->get($key, $group)) + $id = $key; + if ( $this->multisite && ! isset( $this->global_groups[ $group ] ) ) + $id = $this->blog_prefix . $key; + + if ( $this->_exists( $id, $group ) ) return false; - return $this->set($key, $data, $group, $expire); + return $this->set( $key, $data, $group, (int) $expire ); } /** - * Sets the list of global groups. + * Sets the list of global cache groups. * * @since 3.0.0 + * @access public * * @param array $groups List of groups that are global. */ - function add_global_groups( $groups ) { + public function add_global_groups( $groups ) { $groups = (array) $groups; - $this->global_groups = array_merge($this->global_groups, $groups); - $this->global_groups = array_unique($this->global_groups); + $groups = array_fill_keys( $groups, true ); + $this->global_groups = array_merge( $this->global_groups, $groups ); } /** - * Decrement numeric cache item's value + * Decrements numeric cache item's value. * * @since 3.3.0 + * @access public * - * @param int|string $key The cache key to increment - * @param int $offset The amount by which to decrement the item's value. Default is 1. - * @param string $group The group the key is in. + * @param int|string $key The cache key to decrement. + * @param int $offset Optional. The amount by which to decrement the item's value. Default 1. + * @param string $group Optional. The group the key is in. Default 'default'. * @return false|int False on failure, the item's new value on success. */ - function decr( $key, $offset = 1, $group = 'default' ) { - if ( ! isset( $this->cache[ $group ][ $key ] ) ) + public function decr( $key, $offset = 1, $group = 'default' ) { + if ( empty( $group ) ) + $group = 'default'; + + if ( $this->multisite && ! isset( $this->global_groups[ $group ] ) ) + $key = $this->blog_prefix . $key; + + if ( ! $this->_exists( $key, $group ) ) return false; if ( ! is_numeric( $this->cache[ $group ][ $key ] ) ) @@ -339,46 +478,48 @@ class WP_Object_Cache { } /** - * Remove the contents of the cache key in the group + * Removes the contents of the cache key in the group. * - * If the cache key does not exist in the group and $force parameter is set - * to false, then nothing will happen. The $force parameter is set to false - * by default. + * If the cache key does not exist in the group, then nothing will happen. * * @since 2.0.0 + * @access public * - * @param int|string $key What the contents in the cache are called - * @param string $group Where the cache contents are grouped - * @param bool $force Optional. Whether to force the unsetting of the cache - * key in the group - * @return bool False if the contents weren't deleted and true on success + * @param int|string $key What the contents in the cache are called. + * @param string $group Optional. Where the cache contents are grouped. Default 'default'. + * @param bool $deprecated Optional. Unused. Default false. + * @return bool False if the contents weren't deleted and true on success. */ - function delete($key, $group = 'default', $force = false) { - if (empty ($group)) + public function delete( $key, $group = 'default', $deprecated = false ) { + if ( empty( $group ) ) $group = 'default'; - if (!$force && false === $this->get($key, $group)) + if ( $this->multisite && ! isset( $this->global_groups[ $group ] ) ) + $key = $this->blog_prefix . $key; + + if ( ! $this->_exists( $key, $group ) ) return false; - unset ($this->cache[$group][$key]); + unset( $this->cache[$group][$key] ); return true; } /** - * Clears the object cache of all data + * Clears the object cache of all data. * * @since 2.0.0 + * @access public * - * @return bool Always returns true + * @return true Always returns true. */ - function flush() { - $this->cache = array (); + public function flush() { + $this->cache = array(); return true; } /** - * Retrieves the cache contents, if it exists + * Retrieves the cache contents, if it exists. * * The contents will be first attempted to be retrieved by searching by the * key in the cache group. If the cache is hit (success) then the contents @@ -387,18 +528,25 @@ class WP_Object_Cache { * On failure, the number of cache misses will be incremented. * * @since 2.0.0 + * @access public * - * @param int|string $key What the contents in the cache are called - * @param string $group Where the cache contents are grouped - * @param string $force Whether to force a refetch rather than relying on the local cache (default is false) - * @return bool|mixed False on failure to retrieve contents or the cache - * contents on success + * @param int|string $key What the contents in the cache are called. + * @param string $group Optional. Where the cache contents are grouped. Default 'default'. + * @param string $force Optional. Unused. Whether to force a refetch rather than relying on the local + * cache. Default false. + * @param bool $found Optional. Whether the key was found in the cache. Disambiguates a return of + * false, a storable value. Passed by reference. Default null. + * @return false|mixed False on failure to retrieve contents or the cache contents on success. */ - function get( $key, $group = 'default', $force = false) { - if ( empty ($group) ) + public function get( $key, $group = 'default', $force = false, &$found = null ) { + if ( empty( $group ) ) $group = 'default'; - if ( isset ($this->cache[$group][$key]) ) { + if ( $this->multisite && ! isset( $this->global_groups[ $group ] ) ) + $key = $this->blog_prefix . $key; + + if ( $this->_exists( $key, $group ) ) { + $found = true; $this->cache_hits += 1; if ( is_object($this->cache[$group][$key]) ) return clone $this->cache[$group][$key]; @@ -406,22 +554,30 @@ class WP_Object_Cache { return $this->cache[$group][$key]; } + $found = false; $this->cache_misses += 1; return false; } /** - * Increment numeric cache item's value + * Increments numeric cache item's value. * * @since 3.3.0 + * @access public * - * @param int|string $key The cache key to increment - * @param int $offset The amount by which to increment the item's value. Default is 1. - * @param string $group The group the key is in. + * @param int|string $key The cache key to increment + * @param int $offset Optional. The amount by which to increment the item's value. Default 1. + * @param string $group Optional. The group the key is in. Default 'default'. * @return false|int False on failure, the item's new value on success. */ - function incr( $key, $offset = 1, $group = 'default' ) { - if ( ! isset( $this->cache[ $group ][ $key ] ) ) + public function incr( $key, $offset = 1, $group = 'default' ) { + if ( empty( $group ) ) + $group = 'default'; + + if ( $this->multisite && ! isset( $this->global_groups[ $group ] ) ) + $key = $this->blog_prefix . $key; + + if ( ! $this->_exists( $key, $group ) ) return false; if ( ! is_numeric( $this->cache[ $group ][ $key ] ) ) @@ -438,42 +594,54 @@ class WP_Object_Cache { } /** - * Replace the contents in the cache, if contents already exist + * Replaces the contents in the cache, if contents already exist. * * @since 2.0.0 + * @access public + * * @see WP_Object_Cache::set() * - * @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 Where to group the cache contents - * @param int $expire When to expire the cache contents - * @return bool False if not exists, true if contents were replaced + * @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 $expire Optional. When to expire the cache contents. Default 0 (no expiration). + * @return bool False if not exists, true if contents were replaced. */ - function replace($key, $data, $group = 'default', $expire = '') { - if (empty ($group)) + public function replace( $key, $data, $group = 'default', $expire = 0 ) { + if ( empty( $group ) ) $group = 'default'; - if ( false === $this->get($key, $group) ) + $id = $key; + if ( $this->multisite && ! isset( $this->global_groups[ $group ] ) ) + $id = $this->blog_prefix . $key; + + if ( ! $this->_exists( $id, $group ) ) return false; - return $this->set($key, $data, $group, $expire); + return $this->set( $key, $data, $group, (int) $expire ); } /** - * Reset keys + * Resets cache keys. * * @since 3.0.0 + * @access public + * + * @deprecated 3.5.0 Use switch_to_blog() + * @see switch_to_blog() */ - function reset() { + public function reset() { + _deprecated_function( __FUNCTION__, '3.5.0', 'switch_to_blog()' ); + // Clear out non-global caches since the blog ID has changed. - foreach ( array_keys($this->cache) as $group ) { - if ( !in_array($group, $this->global_groups) ) - unset($this->cache[$group]); + foreach ( array_keys( $this->cache ) as $group ) { + if ( ! isset( $this->global_groups[ $group ] ) ) + unset( $this->cache[ $group ] ); } } /** - * Sets the data contents into the cache + * 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 @@ -485,21 +653,22 @@ class WP_Object_Cache { * more for cache plugins which use files. * * @since 2.0.0 + * @access public * - * @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 Where to group the cache contents - * @param int $expire Not Used - * @return bool Always returns true + * @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 $expire Not Used. + * @return true Always returns true. */ - function set($key, $data, $group = 'default', $expire = '') { - if ( empty ($group) ) + public function set( $key, $data, $group = 'default', $expire = 0 ) { + if ( empty( $group ) ) $group = 'default'; - if ( NULL === $data ) - $data = ''; + if ( $this->multisite && ! isset( $this->global_groups[ $group ] ) ) + $key = $this->blog_prefix . $key; - if ( is_object($data) ) + if ( is_object( $data ) ) $data = clone $data; $this->cache[$group][$key] = $data; @@ -513,44 +682,80 @@ class WP_Object_Cache { * key and the data. * * @since 2.0.0 + * @access public */ - function stats() { + public function stats() { echo "

"; echo "Cache Hits: {$this->cache_hits}
"; echo "Cache Misses: {$this->cache_misses}
"; echo "

"; echo ''; } /** - * Sets up object properties; PHP 5 style constructor + * Switches the internal blog ID. + * + * This changes the blog ID used to create keys in blog specific groups. + * + * @since 3.5.0 + * @access public + * + * @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 + * @access protected + * + * @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 - * @return null|WP_Object_Cache If cache is disabled, returns null. + * + * @global int $blog_id Global blog ID. */ - function __construct() { + public function __construct() { + global $blog_id; + + $this->multisite = is_multisite(); + $this->blog_prefix = $this->multisite ? $blog_id . ':' : ''; + + /** * @todo This should be moved to the PHP4 style constructor, PHP5 * already calls __destruct() */ - register_shutdown_function(array(&$this, "__destruct")); + register_shutdown_function( array( $this, '__destruct' ) ); } /** - * Will save the object cache before object is completely destroyed. + * Saves the object cache before object is completely destroyed. * * Called upon object destruction, which should be when PHP ends. * - * @since 2.0.8 + * @since 2.0.8 * - * @return bool True value. Won't be used by PHP + * @return true Always returns true. */ - function __destruct() { + public function __destruct() { return true; } } -?>