WordPressを読む　20 /blog/wp-includes/cache.php

2014/11/29 2015/01/10

1 /blog/wp-includes/cache.php
2 関数　wp_cache_add()
3 関数　wp_cache_close()
4 関数　wp_cache_decr()
5 関数　wp_cache_delete()
6 関数　wp_cache_flush()
7 関数　wp_cache_get()
8 関数　wp_cache_incr()
9 関数　wp_cache_init()
10 関数　wp_cache_replace()
11 関数　wp_cache_set()
12 関数　wp_cache_switch_to_blog()
13 関数　wp_cache_add_global_groups()
14 関数　wp_cache_add_non_persistent_groups()
15 関数　wp_cache_reset()
16 WP_Object_Cache::クラス変数
17 WP_Object_Cache::__get()
18 WP_Object_Cache::__set()
19 WP_Object_Cache::__isset()
20 WP_Object_Cache:: __unset()
21 WP_Object_Cache::add()
22 WP_Object_Cache::add_global_groups()
23 WP_Object_Cache::decr()
24 WP_Object_Cache::delete()
25 WP_Object_Cache::flush()
26 WP_Object_Cache::get()
27 WP_Object_Cache::incr()
28 WP_Object_Cache::replace()
29 WP_Object_Cache::reset()
30 WP_Object_Cache::set()
31 WP_Object_Cache::stats()
32 WP_Object_Cache::switch_to_blog()
33 WP_Object_Cache::_exists()
34 WP_Object_Cache::__construct()
35 WP_Object_Cache::__destruct()

/blog/wp-includes/cache.php

関数　wp_cache_add()

<?php
/**
 * Object Cache API
 *
 * @link http://codex.wordpress.org/Function_Reference/WP_Cache
 *
 * @package WordPress
 * @subpackage Cache
 */

/**
 * 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()
 *
 * @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 bool False if cache key and group already exist, true on success
 */
function wp_cache_add( $key, $data, $group = '', $expire = 0 ) {
	global $wp_object_cache;

	return $wp_object_cache->add( $key, $data, $group, (int) $expire );
}

<?php

/**

* Object Cache API

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

* @package WordPress

* @subpackage Cache

/**

* 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()

* @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 bool False if cache key and group already exist, true on success

function wp_cache_add( $key, $data, $group = '', $expire = 0 ) {

global $wp_object_cache;

return $wp_object_cache->add( $key, $data, $group, (int) $expire );

}

関数　wp_cache_close()

/**
 * 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.
 *
 * @since 2.0.0
 *
 * @return bool Always returns True
 */
function wp_cache_close() {
	return true;
}

/**

* 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.

* @since 2.0.0

* @return bool Always returns True

function wp_cache_close() {

return true;

}

関数　wp_cache_decr()

/**
 * Decrement numeric cache item's value
 *
 * @since 3.3.0
 * @uses $wp_object_cache Object Cache Class
 * @see WP_Object_Cache::decr()
 *
 * @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.
 * @return false|int False on failure, the item's new value on success.
 */
function wp_cache_decr( $key, $offset = 1, $group = '' ) {
	global $wp_object_cache;

	return $wp_object_cache->decr( $key, $offset, $group );
}

/**

* Decrement numeric cache item's value

* @since 3.3.0

* @uses $wp_object_cache Object Cache Class

* @see WP_Object_Cache::decr()

* @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.

* @return false|int False on failure, the item's new value on success.

function wp_cache_decr( $key, $offset = 1, $group = '' ) {

global $wp_object_cache;

return $wp_object_cache->decr( $key, $offset, $group );

}

関数　wp_cache_delete()

/**
 * Removes the cache contents matching key and group.
 *
 * @since 2.0.0
 * @uses $wp_object_cache Object Cache Class
 * @see WP_Object_Cache::delete()
 *
 * @param int|string $key What the contents in the cache are called
 * @param string $group Where the cache contents are grouped
 * @return bool True on successful removal, false on failure
 */
function wp_cache_delete($key, $group = '') {
	global $wp_object_cache;

	return $wp_object_cache->delete($key, $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()

* @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

function wp_cache_delete($key, $group = '') {

global $wp_object_cache;

return $wp_object_cache->delete($key, $group);

}

関数　wp_cache_flush()

/**
 * Removes all cache items.
 *
 * @since 2.0.0
 * @uses $wp_object_cache Object Cache Class
 * @see WP_Object_Cache::flush()
 *
 * @return bool False on failure, true on success
 */
function wp_cache_flush() {
	global $wp_object_cache;

	return $wp_object_cache->flush();
}

/**

* Removes all cache items.

* @since 2.0.0

* @uses $wp_object_cache Object Cache Class

* @see WP_Object_Cache::flush()

* @return bool False on failure, true on success

function wp_cache_flush() {

global $wp_object_cache;

return $wp_object_cache->flush();

}

関数　wp_cache_get()

/**
 * 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()
 *
 * @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 &bool $found Whether key was found in the cache. Disambiguates a return of false, a storable value.
 * @return bool|mixed False on failure to retrieve contents or the cache
 *		contents on success
 */
function wp_cache_get( $key, $group = '', $force = false, &$found = null ) {
	global $wp_object_cache;

	return $wp_object_cache->get( $key, $group, $force, $found );
}

/**

* 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()

* @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 &bool $found Whether key was found in the cache. Disambiguates a return of false, a storable value.

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

* contents on success

function wp_cache_get( $key, $group = '', $force = false, &$found = null ) {

global $wp_object_cache;

return $wp_object_cache->get( $key, $group, $force, $found );

}

関数　wp_cache_incr()

/**
 * Increment numeric cache item's value
 *
 * @since 3.3.0
 * @uses $wp_object_cache Object Cache Class
 * @see WP_Object_Cache::incr()
 *
 * @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.
 * @return false|int False on failure, the item's new value on success.
 */
function wp_cache_incr( $key, $offset = 1, $group = '' ) {
	global $wp_object_cache;

	return $wp_object_cache->incr( $key, $offset, $group );
}

/**

* Increment numeric cache item's value

* @since 3.3.0

* @uses $wp_object_cache Object Cache Class

* @see WP_Object_Cache::incr()

* @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.

* @return false|int False on failure, the item's new value on success.

function wp_cache_incr( $key, $offset = 1, $group = '' ) {

global $wp_object_cache;

return $wp_object_cache->incr( $key, $offset, $group );

}

関数　wp_cache_init()

/**
 * Sets up Object Cache Global and assigns it.
 *
 * @since 2.0.0
 * @global WP_Object_Cache $wp_object_cache WordPress Object Cache
 */
function wp_cache_init() {
	$GLOBALS['wp_object_cache'] = new WP_Object_Cache();
}

/**

* Sets up Object Cache Global and assigns it.

* @since 2.0.0

* @global WP_Object_Cache $wp_object_cache WordPress Object Cache

function wp_cache_init() {

$GLOBALS['wp_object_cache'] = new WP_Object_Cache();

}

関数　wp_cache_replace()

/**
 * 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()
 *
 * @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
 */
function wp_cache_replace( $key, $data, $group = '', $expire = 0 ) {
	global $wp_object_cache;

	return $wp_object_cache->replace( $key, $data, $group, (int) $expire );
}

/**

* 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()

* @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

function wp_cache_replace( $key, $data, $group = '', $expire = 0 ) {

global $wp_object_cache;

return $wp_object_cache->replace( $key, $data, $group, (int) $expire );

}

関数　wp_cache_set()

/**
 * Saves the data to the cache.
 *
 * @since 2.0.0
 *
 * @uses $wp_object_cache Object Cache Class
 * @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 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 );
}

/**

* Saves the data to the cache.

* @since 2.0.0

* @uses $wp_object_cache Object Cache Class

* @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 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 );

}

関数　wp_cache_switch_to_blog()

/**
 * Switch the interal 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
 */
function wp_cache_switch_to_blog( $blog_id ) {
	global $wp_object_cache;

	return $wp_object_cache->switch_to_blog( $blog_id );
}

/**

* Switch the interal 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

function wp_cache_switch_to_blog( $blog_id ) {

global $wp_object_cache;

return $wp_object_cache->switch_to_blog( $blog_id );

}

関数　wp_cache_add_global_groups()

/**
 * Adds a group or set of groups to the list of global groups.
 *
 * @since 2.6.0
 *
 * @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 );
}

/**

* Adds a group or set of groups to the list of global groups.

* @since 2.6.0

* @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 );

}

関数　wp_cache_add_non_persistent_groups()

/**
 * Adds a group or set of groups to the list of non-persistent groups.
 *
 * @since 2.6.0
 *
 * @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;
}

/**

* Adds a group or set of groups to the list of non-persistent groups.

* @since 2.6.0

* @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;

}

関数　wp_cache_reset()

/**
 * 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.
 *
 * 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
 */
function wp_cache_reset() {
	_deprecated_function( __FUNCTION__, '3.5' );

	global $wp_object_cache;

	return $wp_object_cache->reset();
}

/**

* 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.

* 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

function wp_cache_reset() {

_deprecated_function( __FUNCTION__, '3.5' );

global $wp_object_cache;

return $wp_object_cache->reset();

}

WP_Object_Cache::クラス変数

/**
 * 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 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
 * @since 2.0.0
 */
class WP_Object_Cache {

	/**
	 * Holds the cached objects
	 *
	 * @var array
	 * @access private
	 * @since 2.0.0
	 */
	private $cache = array();

	/**
	 * The amount of times the cache data was already stored in the cache.
	 *
	 * @since 2.5.0
	 * @access private
	 * @var int
	 */
	private $cache_hits = 0;

	/**
	 * Amount of times the cache did not have the request in cache
	 *
	 * @var int
	 * @access public
	 * @since 2.0.0
	 */
	public $cache_misses = 0;

	/**
	 * List of global groups
	 *
	 * @var array
	 * @access protected
	 * @since 3.0.0
	 */
	protected $global_groups = array();

	/**
	 * The blog prefix to prepend to keys in non-global groups.
	 *
	 * @var int
	 * @access private
	 * @since 3.5.0
	 */
	private $blog_prefix;

/**

* 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 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

* @since 2.0.0

class WP_Object_Cache {

/**

* Holds the cached objects

* @var array

* @access private

* @since 2.0.0

private $cache = array();

/**

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

* @since 2.5.0

* @access private

* @var int

private $cache_hits = 0;

/**

* Amount of times the cache did not have the request in cache

* @var int

* @access public

* @since 2.0.0

public $cache_misses = 0;

/**

* List of global groups

* @var array

* @access protected

* @since 3.0.0

protected $global_groups = array();

/**

* The blog prefix to prepend to keys in non-global groups.

* @var int

* @access private

* @since 3.5.0

private $blog_prefix;

WP_Object_Cache::__get()

	/**
	 * Make private properties readable for backwards compatibility.
	 *
	 * @since 4.0.0
	 * @access public
	 *
	 * @param string $name Property to get.
	 * @return mixed Property.
	 */
	public function __get( $name ) {
		return $this->$name;
	}

/**

* Make private properties readable for backwards compatibility.

* @since 4.0.0

* @access public

* @param string $name Property to get.

* @return mixed Property.

public function __get( $name ) {

return $this->$name;

}

WP_Object_Cache::__set()

	/**
	 * Make private properties settable for backwards 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;
	}

/**

* Make private properties settable for backwards 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;

}

WP_Object_Cache::__isset()

	/**
	 * Make private properties checkable for backwards 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 );
	}

/**

* Make private properties checkable for backwards 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 );

}

WP_Object_Cache:: __unset()

	/**
	 * Make private properties un-settable for backwards compatibility.
	 *
	 * @since 4.0.0
	 * @access public
	 *
	 * @param string $name Property to unset.
	 */
	public function __unset( $name ) {
		unset( $this->$name );
	}

/**

* Make private properties un-settable for backwards compatibility.

* @since 4.0.0

* @access public

* @param string $name Property to unset.

public function __unset( $name ) {

unset( $this->$name );

}

WP_Object_Cache::add()

	/**
	 * Adds data to the cache if it doesn't already exist.
	 *
	 * @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.
	 *
	 * @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 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
	 */
	public function add( $key, $data, $group = 'default', $expire = 0 ) {
		if ( wp_suspend_cache_addition() )
			return false;

		if ( empty( $group ) )
			$group = 'default';

		$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, (int) $expire );
	}

/**

* Adds data to the cache if it doesn't already exist.

* @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.

* @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 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

public function add( $key, $data, $group = 'default', $expire = 0 ) {

if ( wp_suspend_cache_addition() )

return false;

if ( empty( $group ) )

$group = 'default';

$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, (int) $expire );

}

WP_Object_Cache::add_global_groups()

	/**
	 * Sets the list of global groups.
	 *
	 * @since 3.0.0
	 *
	 * @param array $groups List of groups that are global.
	 */
	public function add_global_groups( $groups ) {
		$groups = (array) $groups;

		$groups = array_fill_keys( $groups, true );
		$this->global_groups = array_merge( $this->global_groups, $groups );
	}

/**

* Sets the list of global groups.

* @since 3.0.0

* @param array $groups List of groups that are global.

public function add_global_groups( $groups ) {

$groups = (array) $groups;

$groups = array_fill_keys( $groups, true );

$this->global_groups = array_merge( $this->global_groups, $groups );

}

WP_Object_Cache::decr()

	/**
	 * Decrement numeric cache item's value
	 *
	 * @since 3.3.0
	 *
	 * @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.
	 * @return false|int False on failure, the item's new value on success.
	 */
	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 ] ) )
			$this->cache[ $group ][ $key ] = 0;

		$offset = (int) $offset;

		$this->cache[ $group ][ $key ] -= $offset;

		if ( $this->cache[ $group ][ $key ] < 0 )
			$this->cache[ $group ][ $key ] = 0;

		return $this->cache[ $group ][ $key ];
	}

/**

* Decrement numeric cache item's value

* @since 3.3.0

* @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.

* @return false|int False on failure, the item's new value on success.

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 ] ) )

$this->cache[ $group ][ $key ] = 0;

$offset = (int) $offset;

$this->cache[ $group ][ $key ] -= $offset;

if ( $this->cache[ $group ][ $key ] < 0 )

$this->cache[ $group ][ $key ] = 0;

return $this->cache[ $group ][ $key ];

}

WP_Object_Cache::delete()

	/**
	 * Remove the contents of the cache key in the group
	 *
	 * If the cache key does not exist in the group, then nothing will happen.
	 *
	 * @since 2.0.0
	 *
	 * @param int|string $key What the contents in the cache are called
	 * @param string $group Where the cache contents are grouped
	 * @param bool $deprecated Deprecated.
	 *
	 * @return bool False if the contents weren't deleted and true on success
	 */
	public function delete( $key, $group = 'default', $deprecated = false ) {
		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;

		unset( $this->cache[$group][$key] );
		return true;
	}

/**

* Remove the contents of the cache key in the group

* If the cache key does not exist in the group, then nothing will happen.

* @since 2.0.0

* @param int|string $key What the contents in the cache are called

* @param string $group Where the cache contents are grouped

* @param bool $deprecated Deprecated.

* @return bool False if the contents weren't deleted and true on success

public function delete( $key, $group = 'default', $deprecated = false ) {

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;

unset( $this->cache[$group][$key] );

return true;

}

WP_Object_Cache::flush()

	/**
	 * Clears the object cache of all data
	 *
	 * @since 2.0.0
	 *
	 * @return bool Always returns true
	 */
	public function flush() {
		$this->cache = array ();

		return true;
	}

/**

* Clears the object cache of all data

* @since 2.0.0

* @return bool Always returns true

public function flush() {

$this->cache = array ();

return true;

}

WP_Object_Cache::get()

	/**
	 * 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
	 * are returned.
	 *
	 * On failure, the number of cache misses will be incremented.
	 *
	 * @since 2.0.0
	 *
	 * @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
	 */
	public function get( $key, $group = 'default', $force = false, &$found = null ) {
		if ( empty( $group ) )
			$group = 'default';

		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];
			else
				return $this->cache[$group][$key];
		}

		$found = false;
		$this->cache_misses += 1;
		return false;
	}

/**

* 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

* are returned.

* On failure, the number of cache misses will be incremented.

* @since 2.0.0

* @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

public function get( $key, $group = 'default', $force = false, &$found = null ) {

if ( empty( $group ) )

$group = 'default';

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];

else

return $this->cache[$group][$key];

}

$found = false;

$this->cache_misses += 1;

return false;

}

WP_Object_Cache::incr()

	/**
	 * Increment numeric cache item's value
	 *
	 * @since 3.3.0
	 *
	 * @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.
	 * @return false|int False on failure, the item's new value on success.
	 */
	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 ] ) )
			$this->cache[ $group ][ $key ] = 0;

		$offset = (int) $offset;

		$this->cache[ $group ][ $key ] += $offset;

		if ( $this->cache[ $group ][ $key ] < 0 )
			$this->cache[ $group ][ $key ] = 0;

		return $this->cache[ $group ][ $key ];
	}

/**

* Increment numeric cache item's value

* @since 3.3.0

* @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.

* @return false|int False on failure, the item's new value on success.

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 ] ) )

$this->cache[ $group ][ $key ] = 0;

$offset = (int) $offset;

$this->cache[ $group ][ $key ] += $offset;

if ( $this->cache[ $group ][ $key ] < 0 )

$this->cache[ $group ][ $key ] = 0;

return $this->cache[ $group ][ $key ];

}

WP_Object_Cache::replace()

	/**
	 * Replace the contents in the cache, if contents already exist
	 *
	 * @since 2.0.0
	 * @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
	 */
	public function replace( $key, $data, $group = 'default', $expire = 0 ) {
		if ( empty( $group ) )
			$group = 'default';

		$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, (int) $expire );
	}

/**

* Replace the contents in the cache, if contents already exist

* @since 2.0.0

* @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

public function replace( $key, $data, $group = 'default', $expire = 0 ) {

if ( empty( $group ) )

$group = 'default';

$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, (int) $expire );

}

WP_Object_Cache::reset()

	/**
	 * Reset keys
	 *
	 * @since 3.0.0
	 * @deprecated 3.5.0
	 */
	public function reset() {
		_deprecated_function( __FUNCTION__, '3.5', 'switch_to_blog()' );

		// Clear out non-global caches since the blog ID has changed.
		foreach ( array_keys( $this->cache ) as $group ) {
			if ( ! isset( $this->global_groups[ $group ] ) )
				unset( $this->cache[ $group ] );
		}
	}

/**

* Reset keys

* @since 3.0.0

* @deprecated 3.5.0

public function reset() {

_deprecated_function( __FUNCTION__, '3.5', 'switch_to_blog()' );

// Clear out non-global caches since the blog ID has changed.

foreach ( array_keys( $this->cache ) as $group ) {

if ( ! isset( $this->global_groups[ $group ] ) )

unset( $this->cache[ $group ] );

}

WP_Object_Cache::set()

	/**
	 * 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 Where to group the cache contents
	 * @param int $expire Not Used
	 * @return bool 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;
	}

/**

* 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 Where to group the cache contents

* @param int $expire Not Used

* @return bool 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;

}

WP_Object_Cache::stats()

	/**
	 * 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 ) ) / 1024, 2 ) . 'k )</li>';
		}
		echo '</ul>';
	}

/**

* 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 "";

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

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

echo "";

echo '<ul>';

foreach ($this->cache as $group => $cache) {

echo "<li>Group: $group - ( " . number_format( strlen( serialize( $cache ) ) / 1024, 2 ) . 'k )</li>';

}

echo '</ul>';

}

WP_Object_Cache::switch_to_blog()

	/**
	 * Switch the interal 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 . ':' : '';
	}

/**

* Switch the interal 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 . ':' : '';

}

WP_Object_Cache::_exists()

	/**
	 * Utility function to determine whether a key exists in the cache.
	 *
	 * @since 3.4.0
	 *
	 * @access protected
	 */
	protected function _exists( $key, $group ) {
		return isset( $this->cache[ $group ] ) && ( isset( $this->cache[ $group ][ $key ] ) || array_key_exists( $key, $this->cache[ $group ] ) );
	}

/**

* Utility function to determine whether a key exists in the cache.

* @since 3.4.0

* @access protected

protected function _exists( $key, $group ) {

return isset( $this->cache[ $group ] ) && ( isset( $this->cache[ $group ][ $key ] ) || array_key_exists( $key, $this->cache[ $group ] ) );

}

WP_Object_Cache::__construct()

	/**
	 * Sets up object properties; PHP 5 style constructor
	 *
	 * @since 2.0.8
	 * @return null|WP_Object_Cache If cache is disabled, returns null.
	 */
	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' ) );
	}

/**

* Sets up object properties; PHP 5 style constructor

* @since 2.0.8

* @return null|WP_Object_Cache If cache is disabled, returns null.

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' ) );

}

WP_Object_Cache::__destruct()

	/**
	 * Will save the object cache before object is completely destroyed.
	 *
	 * Called upon object destruction, which should be when PHP ends.
	 *
	 * @since  2.0.8
	 *
	 * @return bool True value. Won't be used by PHP
	 */
	public function __destruct() {
		return true;
	}
}

/**

* Will save the object cache before object is completely destroyed.

* Called upon object destruction, which should be when PHP ends.

* @since 2.0.8

* @return bool True value. Won't be used by PHP

public function __destruct() {

return true;

}

WP_Object_Cache::クラス定義終了

- Wordpress

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WordPressを読む 20 /blog/wp-includes/cache.php

/blog/wp-includes/cache.php

WordPressを読む　20 /blog/wp-includes/cache.php