Wordpress 2.6.2

[autoinstalls/wordpress.git] / wp-includes / cache.php

diff --git a/wp-includes/cache.php b/wp-includes/cache.php
index bb6cafa39891140e0fd033ee2e1dfc27825daed3..cfdab824e42826cd1b8284ef1411d0ceeb5fcf09 100644 (file)
--- a/wp-includes/cache.php
+++ b/wp-includes/cache.php
@@ -2,12 +2,14 @@
 /**
  * Object Cache API
  *
 /**
  * Object Cache API
  *

+ * @link http://codex.wordpress.org/Function_Reference/WP_Cache
+ *

  * @package WordPress
  * @subpackage Cache
  */
 
 /**
  * @package WordPress
  * @subpackage Cache
  */
 
 /**

- * wp_cache_add() - Adds data to the cache, if the cache key doesn't aleady exist
+ * Adds data to the cache, if the cache key doesn't aleady exist.

  *
  * @since 2.0
  * @uses $wp_object_cache Object Cache Class
  *
  * @since 2.0
  * @uses $wp_object_cache Object Cache Class


@@ -26,11 +28,12 @@ function wp_cache_add($key, $data, $flag = '', $expire = 0) {
 }
 
 /**
 }
 
 /**

- * wp_cache_close() - Closes the cache
+ * Closes the cache.

  *
  *

- * This function has ceased to do anything since WordPress 2.5.
- * The functionality was removed along with the rest of the
- * persistant cache.
+ * This function has ceased to do anything since WordPress 2.5. The
+ * functionality was removed along with the rest of the persistant 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
  *
  *
  * @since 2.0
  *


@@ -41,7 +44,7 @@ function wp_cache_close() {
 }
 
 /**
 }
 
 /**

- * wp_cache_delete() - Removes the cache contents matching ID and flag
+ * Removes the cache contents matching ID and flag.

  *
  * @since 2.0
  * @uses $wp_object_cache Object Cache Class
  *
  * @since 2.0
  * @uses $wp_object_cache Object Cache Class


@@ -58,7 +61,7 @@ function wp_cache_delete($id, $flag = '') {
 }
 
 /**
 }
 
 /**

- * wp_cache_flush() - Removes all cache items
+ * Removes all cache items.

  *
  * @since 2.0
  * @uses $wp_object_cache Object Cache Class
  *
  * @since 2.0
  * @uses $wp_object_cache Object Cache Class


@@ -73,7 +76,7 @@ function wp_cache_flush() {
 }
 
 /**
 }
 
 /**

- * wp_cache_get() - Retrieves the cache contents from the cache by ID and flag
+ * Retrieves the cache contents from the cache by ID and flag.

  *
  * @since 2.0
  * @uses $wp_object_cache Object Cache Class
  *
  * @since 2.0
  * @uses $wp_object_cache Object Cache Class


@@ -81,7 +84,8 @@ function wp_cache_flush() {
  *
  * @param int|string $id What the contents in the cache are called
  * @param string $flag Where the cache contents are grouped
  *
  * @param int|string $id What the contents in the cache are called
  * @param string $flag Where the cache contents are grouped

- * @return bool|mixed False on failure to retrieve contents or the cache contents on success
+ * @return bool|mixed False on failure to retrieve contents or the cache
+ *             contents on success

  */
 function wp_cache_get($id, $flag = '') {
        global $wp_object_cache;
  */
 function wp_cache_get($id, $flag = '') {
        global $wp_object_cache;


@@ -90,7 +94,7 @@ function wp_cache_get($id, $flag = '') {
 }
 
 /**
 }
 
 /**

- * wp_cache_init() - Sets up Object Cache Global and assigns it
+ * Sets up Object Cache Global and assigns it.

  *
  * @since 2.0
  * @global WP_Object_Cache $wp_object_cache WordPress Object Cache
  *
  * @since 2.0
  * @global WP_Object_Cache $wp_object_cache WordPress Object Cache


@@ -100,7 +104,7 @@ function wp_cache_init() {
 }
 
 /**
 }
 
 /**

- * wp_cache_replace() - Replaces the contents of the cache with new data
+ * Replaces the contents of the cache with new data.

  *
  * @since 2.0
  * @uses $wp_object_cache Object Cache Class
  *
  * @since 2.0
  * @uses $wp_object_cache Object Cache Class


@@ -119,7 +123,7 @@ function wp_cache_replace($key, $data, $flag = '', $expire = 0) {
 }
 
 /**
 }
 
 /**

- * wp_cache_set() - Saves the data to the cache
+ * Saves the data to the cache.

  *
  * @since 2.0
  * @uses $wp_object_cache Object Cache Class
  *
  * @since 2.0
  * @uses $wp_object_cache Object Cache Class


@@ -137,17 +141,41 @@ function wp_cache_set($key, $data, $flag = '', $expire = 0) {
        return $wp_object_cache->set($key, $data, $flag, $expire);
 }
 
        return $wp_object_cache->set($key, $data, $flag, $expire);
 }
 

+/**
+ * Adds a group or set of groups to the list of global groups.
+ *
+ * @since 2.6
+ *
+ * @param string|array $groups A group or an array of groups to add
+ */
+function wp_cache_add_global_groups( $groups ) {
+       // Default cache doesn't persist so nothing to do here.
+       return;
+}
+
+/**
+ * Adds a group or set of groups to the list of non-persistent groups.
+ *
+ * @since 2.6
+ *
+ * @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;
+}
+

 /**
  * WordPress Object Cache
  *
 /**
  * WordPress 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 contents available by using a key, which is used to name and
- * later retrieve the cache contents.
+ * 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
+ * contents available by using a key, which is used to name and later retrieve
+ * the cache contents.

  *
  *

- * The Object Cache can be replaced by other caching mechanisms by placing
- * files in the wp-content folder which is looked at in wp-settings. If
- * that file exists, then this file will not be included.
+ * The Object Cache can be replaced by other caching mechanisms by placing files
+ * in the wp-content folder which is looked at in wp-settings. If that file
+ * exists, then this file will not be included.

  *
  * @package WordPress
  * @subpackage Cache
  *
  * @package WordPress
  * @subpackage Cache


@@ -173,15 +201,6 @@ class WP_Object_Cache {
         */
        var $non_existant_objects = array ();
 
         */
        var $non_existant_objects = array ();
 

-       /**
-        * Object caches that are global
-        *
-        * @var array
-        * @access private
-        * @since 2.0
-        */
-       var $global_groups = array ('users', 'userlogins', 'usermeta');
-

        /**
         * The amount of times the cache data was already stored in the cache.
         *
        /**
         * The amount of times the cache data was already stored in the cache.
         *


@@ -204,7 +223,8 @@ class WP_Object_Cache {
         * Adds data to the cache if it doesn't already exist.
         *
         * @uses WP_Object_Cache::get Checks to see if the cache already has data.
         * Adds data to the cache if it doesn't already exist.
         *
         * @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 existance.
+        * @uses WP_Object_Cache::set Sets the data after the checking the cache
+        *              contents existance.

         *
         * @since 2.0
         *
         *
         * @since 2.0
         *


@@ -227,18 +247,19 @@ class WP_Object_Cache {
        /**
         * Remove the contents of the cache ID in the group
         *
        /**
         * Remove the contents of the cache ID in the group
         *

-        * If the cache ID 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 ID 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.

         *
         *

-        * On success the group and the id will be added to the
+        * On success the group and the id will be added to the 

         * $non_existant_objects property in the class.
         *
         * @since 2.0
         *
         * @param int|string $id What the contents in the cache are called
         * @param string $group Where the cache contents are grouped
         * $non_existant_objects property in the class.
         *
         * @since 2.0
         *
         * @param int|string $id 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 ID in the group
+        * @param bool $force Optional. Whether to force the unsetting of the cache
+        *              ID in the group

         * @return bool False if the contents weren't deleted and true on success
         */
        function delete($id, $group = 'default', $force = false) {
         * @return bool False if the contents weren't deleted and true on success
         */
        function delete($id, $group = 'default', $force = false) {


@@ -269,21 +290,22 @@ class WP_Object_Cache {
        /**
         * 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 ID in the cache group. If the cache is hit (success) then
-        * the contents are returned.
+        * The contents will be first attempted to be retrieved by searching by the
+        * ID in the cache group. If the cache is hit (success) then the contents
+        * are returned.

         *
         *

-        * On failure, the $non_existant_objects property is checked and if
-        * the cache group and ID exist in there the cache misses will not be
-        * incremented. If not in the nonexistant objects property, then the
-        * cache misses will be incremented and the cache group and ID will
-        * be added to the nonexistant objects.
+        * On failure, the $non_existant_objects property is checked and if the
+        * cache group and ID exist in there the cache misses will not be
+        * incremented. If not in the nonexistant objects property, then the cache
+        * misses will be incremented and the cache group and ID will be added to
+        * the nonexistant objects.

         *
         * @since 2.0
         *
         * @param int|string $id What the contents in the cache are called
         * @param string $group Where the cache contents are grouped
         *
         * @since 2.0
         *
         * @param int|string $id What the contents in the cache are called
         * @param string $group Where the cache contents are grouped

-        * @return bool|mixed False on failure to retrieve contents or the cache contents on success
+        * @return bool|mixed False on failure to retrieve contents or the cache
+        *              contents on success

         */
        function get($id, $group = 'default') {
                if (empty ($group))
         */
        function get($id, $group = 'default') {
                if (empty ($group))


@@ -327,15 +349,14 @@ class WP_Object_Cache {
        /**
         * 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 $id. 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 cache contents is grouped by the $group parameter followed by the
+        * $id. 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.
+        * 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
         *
         *
         * @since 2.0
         *


@@ -363,8 +384,8 @@ class WP_Object_Cache {
        /**
         * Echos the stats of the caching.
         *
        /**
         * Echos the stats of the caching.
         *

-        * Gives the cache hits, and cache misses. Also prints every cached
-        * group, key and the data.
+        * Gives the cache hits, and cache misses. Also prints every cached group,
+        * key and the data.

         *
         * @since 2.0
         */
         *
         * @since 2.0
         */


@@ -402,7 +423,11 @@ class WP_Object_Cache {
         * @return null|WP_Object_Cache If cache is disabled, returns null.
         */
        function __construct() {
         * @return null|WP_Object_Cache If cache is disabled, returns null.
         */
        function __construct() {

-               register_shutdown_function(array(&$this, "__destruct")); /** @todo This should be moved to the PHP4 style constructor, PHP5 already calls __destruct() */
+               /**
+                * @todo This should be moved to the PHP4 style constructor, PHP5
+                * already calls __destruct()
+                */
+               register_shutdown_function(array(&$this, "__destruct"));

        }
 
        /**
        }
 
        /**