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/wp-includes/ -> cache.php (source)

   1  <?php
   2  /**
   3   * Object Cache API
   4   *
   5   * @link https://codex.wordpress.org/Class_Reference/WP_Object_Cache
   6   *
   7   * @package WordPress
   8   * @subpackage Cache
   9   */
  10  
  11  /** WP_Object_Cache class */
  12  require_once  ABSPATH . WPINC . '/class-wp-object-cache.php';
  13  
  14  /**
  15   * Adds data to the cache, if the cache key doesn't already exist.
  16   *
  17   * @since 2.0.0
  18   *
  19   * @see WP_Object_Cache::add()
  20   * @global WP_Object_Cache $wp_object_cache Object cache global instance.
  21   *
  22   * @param int|string $key    The cache key to use for retrieval later.
  23   * @param mixed      $data   The data to add to the cache.
  24   * @param string     $group  Optional. The group to add the cache to. Enables the same key
  25   *                           to be used across groups. Default empty.
  26   * @param int        $expire Optional. When the cache data should expire, in seconds.
  27   *                           Default 0 (no expiration).
  28   * @return bool True on success, false if cache key and group already exist.
  29   */
  30  function wp_cache_add( $key, $data, $group = '', $expire = 0 ) {
  31      global $wp_object_cache;
  32  
  33      return $wp_object_cache->add( $key, $data, $group, (int) $expire );
  34  }
  35  
  36  /**
  37   * Closes the cache.
  38   *
  39   * This function has ceased to do anything since WordPress 2.5. The
  40   * functionality was removed along with the rest of the persistent cache.
  41   *
  42   * This does not mean that plugins can't implement this function when they need
  43   * to make sure that the cache is cleaned up after WordPress no longer needs it.
  44   *
  45   * @since 2.0.0
  46   *
  47   * @return true Always returns true.
  48   */
  49  function wp_cache_close() {
  50      return true;
  51  }
  52  
  53  /**
  54   * Decrements numeric cache item's value.
  55   *
  56   * @since 3.3.0
  57   *
  58   * @see WP_Object_Cache::decr()
  59   * @global WP_Object_Cache $wp_object_cache Object cache global instance.
  60   *
  61   * @param int|string $key    The cache key to decrement.
  62   * @param int        $offset Optional. The amount by which to decrement the item's value. Default 1.
  63   * @param string     $group  Optional. The group the key is in. Default empty.
  64   * @return int|false The item's new value on success, false on failure.
  65   */
  66  function wp_cache_decr( $key, $offset = 1, $group = '' ) {
  67      global $wp_object_cache;
  68  
  69      return $wp_object_cache->decr( $key, $offset, $group );
  70  }
  71  
  72  /**
  73   * Removes the cache contents matching key and group.
  74   *
  75   * @since 2.0.0
  76   *
  77   * @see WP_Object_Cache::delete()
  78   * @global WP_Object_Cache $wp_object_cache Object cache global instance.
  79   *
  80   * @param int|string $key   What the contents in the cache are called.
  81   * @param string     $group Optional. Where the cache contents are grouped. Default empty.
  82   * @return bool True on successful removal, false on failure.
  83   */
  84  function wp_cache_delete( $key, $group = '' ) {
  85      global $wp_object_cache;
  86  
  87      return $wp_object_cache->delete( $key, $group );
  88  }
  89  
  90  /**
  91   * Removes all cache items.
  92   *
  93   * @since 2.0.0
  94   *
  95   * @see WP_Object_Cache::flush()
  96   * @global WP_Object_Cache $wp_object_cache Object cache global instance.
  97   *
  98   * @return bool True on success, false on failure.
  99   */
 100  function wp_cache_flush() {
 101      global $wp_object_cache;
 102  
 103      return $wp_object_cache->flush();
 104  }
 105  
 106  /**
 107   * Retrieves the cache contents from the cache by key and group.
 108   *
 109   * @since 2.0.0
 110   *
 111   * @see WP_Object_Cache::get()
 112   * @global WP_Object_Cache $wp_object_cache Object cache global instance.
 113   *
 114   * @param int|string $key   The key under which the cache contents are stored.
 115   * @param string     $group Optional. Where the cache contents are grouped. Default empty.
 116   * @param bool       $force Optional. Whether to force an update of the local cache
 117   *                          from the persistent cache. Default false.
 118   * @param bool       $found Optional. Whether the key was found in the cache (passed by reference).
 119   *                          Disambiguates a return of false, a storable value. Default null.
 120   * @return mixed|false The cache contents on success, false on failure to retrieve contents.
 121   */
 122  function wp_cache_get( $key, $group = '', $force = false, &$found = null ) {
 123      global $wp_object_cache;
 124  
 125      return $wp_object_cache->get( $key, $group, $force, $found );
 126  }
 127  
 128  /**
 129   * Retrieves multiple values from the cache in one call.
 130   *
 131   * @since 5.5.0
 132   *
 133   * @see WP_Object_Cache::get_multiple()
 134   * @global WP_Object_Cache $wp_object_cache Object cache global instance.
 135   *
 136   * @param array  $keys  Array of keys under which the cache contents are stored.
 137   * @param string $group Optional. Where the cache contents are grouped. Default empty.
 138   * @param bool   $force Optional. Whether to force an update of the local cache
 139   *                      from the persistent cache. Default false.
 140   * @return array Array of values organized into groups.
 141   */
 142  function wp_cache_get_multiple( $keys, $group = '', $force = false ) {
 143      global $wp_object_cache;
 144  
 145      return $wp_object_cache->get_multiple( $keys, $group, $force );
 146  }
 147  
 148  /**
 149   * Increment numeric cache item's value
 150   *
 151   * @since 3.3.0
 152   *
 153   * @see WP_Object_Cache::incr()
 154   * @global WP_Object_Cache $wp_object_cache Object cache global instance.
 155   *
 156   * @param int|string $key    The key for the cache contents that should be incremented.
 157   * @param int        $offset Optional. The amount by which to increment the item's value. Default 1.
 158   * @param string     $group  Optional. The group the key is in. Default empty.
 159   * @return int|false The item's new value on success, false on failure.
 160   */
 161  function wp_cache_incr( $key, $offset = 1, $group = '' ) {
 162      global $wp_object_cache;
 163  
 164      return $wp_object_cache->incr( $key, $offset, $group );
 165  }
 166  
 167  /**
 168   * Sets up Object Cache Global and assigns it.
 169   *
 170   * @since 2.0.0
 171   *
 172   * @global WP_Object_Cache $wp_object_cache
 173   */
 174  function wp_cache_init() {
 175      $GLOBALS['wp_object_cache'] = new WP_Object_Cache();
 176  }
 177  
 178  /**
 179   * Replaces the contents of the cache with new data.
 180   *
 181   * @since 2.0.0
 182   *
 183   * @see WP_Object_Cache::replace()
 184   * @global WP_Object_Cache $wp_object_cache Object cache global instance.
 185   *
 186   * @param int|string $key    The key for the cache data that should be replaced.
 187   * @param mixed      $data   The new data to store in the cache.
 188   * @param string     $group  Optional. The group for the cache data that should be replaced.
 189   *                           Default empty.
 190   * @param int        $expire Optional. When to expire the cache contents, in seconds.
 191   *                           Default 0 (no expiration).
 192   * @return bool False if original value does not exist, true if contents were replaced
 193   */
 194  function wp_cache_replace( $key, $data, $group = '', $expire = 0 ) {
 195      global $wp_object_cache;
 196  
 197      return $wp_object_cache->replace( $key, $data, $group, (int) $expire );
 198  }
 199  
 200  /**
 201   * Saves the data to the cache.
 202   *
 203   * Differs from wp_cache_add() and wp_cache_replace() in that it will always write data.
 204   *
 205   * @since 2.0.0
 206   *
 207   * @see WP_Object_Cache::set()
 208   * @global WP_Object_Cache $wp_object_cache Object cache global instance.
 209   *
 210   * @param int|string $key    The cache key to use for retrieval later.
 211   * @param mixed      $data   The contents to store in the cache.
 212   * @param string     $group  Optional. Where to group the cache contents. Enables the same key
 213   *                           to be used across groups. Default empty.
 214   * @param int        $expire Optional. When to expire the cache contents, in seconds.
 215   *                           Default 0 (no expiration).
 216   * @return bool True on success, false on failure.
 217   */
 218  function wp_cache_set( $key, $data, $group = '', $expire = 0 ) {
 219      global $wp_object_cache;
 220  
 221      return $wp_object_cache->set( $key, $data, $group, (int) $expire );
 222  }
 223  
 224  /**
 225   * Switches the internal blog ID.
 226   *
 227   * This changes the blog id used to create keys in blog specific groups.
 228   *
 229   * @since 3.5.0
 230   *
 231   * @see WP_Object_Cache::switch_to_blog()
 232   * @global WP_Object_Cache $wp_object_cache Object cache global instance.
 233   *
 234   * @param int $blog_id Site ID.
 235   */
 236  function wp_cache_switch_to_blog( $blog_id ) {
 237      global $wp_object_cache;
 238  
 239      $wp_object_cache->switch_to_blog( $blog_id );
 240  }
 241  
 242  /**
 243   * Adds a group or set of groups to the list of global groups.
 244   *
 245   * @since 2.6.0
 246   *
 247   * @see WP_Object_Cache::add_global_groups()
 248   * @global WP_Object_Cache $wp_object_cache Object cache global instance.
 249   *
 250   * @param string|array $groups A group or an array of groups to add.
 251   */
 252  function wp_cache_add_global_groups( $groups ) {
 253      global $wp_object_cache;
 254  
 255      $wp_object_cache->add_global_groups( $groups );
 256  }
 257  
 258  /**
 259   * Adds a group or set of groups to the list of non-persistent groups.
 260   *
 261   * @since 2.6.0
 262   *
 263   * @param string|array $groups A group or an array of groups to add.
 264   */
 265  function wp_cache_add_non_persistent_groups( $groups ) {
 266      // Default cache doesn't persist so nothing to do here.
 267  }
 268  
 269  /**
 270   * Reset internal cache keys and structures.
 271   *
 272   * If the cache back end uses global blog or site IDs as part of its cache keys,
 273   * this function instructs the back end to reset those keys and perform any cleanup
 274   * since blog or site IDs have changed since cache init.
 275   *
 276   * This function is deprecated. Use wp_cache_switch_to_blog() instead of this
 277   * function when preparing the cache for a blog switch. For clearing the cache
 278   * during unit tests, consider using wp_cache_init(). wp_cache_init() is not
 279   * recommended outside of unit tests as the performance penalty for using it is
 280   * high.
 281   *
 282   * @since 2.6.0
 283   * @deprecated 3.5.0 WP_Object_Cache::reset()
 284   * @see WP_Object_Cache::reset()
 285   *
 286   * @global WP_Object_Cache $wp_object_cache Object cache global instance.
 287   */
 288  function wp_cache_reset() {
 289      _deprecated_function( __FUNCTION__, '3.5.0', 'WP_Object_Cache::reset()' );
 290  
 291      global $wp_object_cache;
 292  
 293      $wp_object_cache->reset();
 294  }


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