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wordpress-azure/wp-includes/cache.php at master · alseaqa/wordpress-azure · GitHub
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<?php
/**
* Object Cache API
*
* @link https://codex.wordpress.org/Class_Reference/WP_Object_Cache
*
* @package WordPress
* @subpackage Cache
*/
/**
* Adds data to the cache, if the cache key doesn't already exist.
*
* @since 2.0.0
*
* @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.
* @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
) {
global
$
wp_object_cache
;
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.
*
* @since 2.0.0
*
* @return true Always returns true.
*/
function
wp_cache_close
() {
return
true
;
}
/**
* Decrements numeric cache item's value.
*
* @since 3.3.0
*
* @see WP_Object_Cache::decr()
* @global WP_Object_Cache $wp_object_cache Object cache global instance.
*
* @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
=
''
) {
global
$
wp_object_cache
;
return
$
wp_object_cache
->
decr
(
$
key
,
$
offset
,
$
group
);
}
/**
* Removes the cache contents matching key and group.
*
* @since 2.0.0
*
* @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 Optional. Where the cache contents are grouped. Default empty.
* @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 all cache items.
*
* @since 2.0.0
*
* @see WP_Object_Cache::flush()
* @global WP_Object_Cache $wp_object_cache Object cache global instance.
*
* @return bool False on failure, true on success
*/
function
wp_cache_flush
() {
global
$
wp_object_cache
;
return
$
wp_object_cache
->
flush
();
}
/**
* Retrieves the cache contents from the cache by key and group.
*
* @since 2.0.0
*
* @see WP_Object_Cache::get()
* @global WP_Object_Cache $wp_object_cache Object cache global instance.
*
* @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
*/
function
wp_cache_get
(
$
key
,
$
group
=
''
,
$
force
=
false
, &
$
found
=
null
) {
global
$
wp_object_cache
;
return
$
wp_object_cache
->
get
(
$
key
,
$
group
,
$
force
,
$
found
);
}
/**
* Increment numeric cache item's value
*
* @since 3.3.0
*
* @see WP_Object_Cache::incr()
* @global WP_Object_Cache $wp_object_cache Object cache global instance.
*
* @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
=
''
) {
global
$
wp_object_cache
;
return
$
wp_object_cache
->
incr
(
$
key
,
$
offset
,
$
group
);
}
/**
* Sets up Object Cache Global and assigns it.
*
* @since 2.0.0
*
* @global WP_Object_Cache $wp_object_cache
*/
function
wp_cache_init
() {
$
GLOBALS
[
'
wp_object_cache
'
] =
new
WP_Object_Cache
();
}
/**
* Replaces the contents of the cache with new data.
*
* @since 2.0.0
*
* @see WP_Object_Cache::replace()
* @global WP_Object_Cache $wp_object_cache Object cache global instance.
*
* @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
) {
global
$
wp_object_cache
;
return
$
wp_object_cache
->
replace
(
$
key
,
$
data
,
$
group
, (
int
)
$
expire
);
}
/**
* Saves the data to the cache.
*
* 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.
*
* @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_switch_to_blog
(
$
blog_id
) {
global
$
wp_object_cache
;
$
wp_object_cache
->
switch_to_blog
(
$
blog_id
);
}
/**
* Adds a group or set of groups to the list of global groups.
*
* @since 2.6.0
*
* @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
;
$
wp_object_cache
->
add_global_groups
(
$
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.
}
/**
* 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 penalty 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
;
$
wp_object_cache
->
reset
();
}
/**
* 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
* 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.
*
* @since 2.0.0
* @access private
* @var array
*/
private
$
cache
=
array
();
/**
* The amount of times the cache data was already stored in the cache.
*
* @since 2.5.0
* @access public
* @var int
*/
public
$
cache_hits
=
0
;
/**
* Amount of times the cache did not have the request in cache.
*
* @since 2.0.0
* @access public
* @var int
*/
public
$
cache_misses
=
0
;
/**
* List of global cache groups.
*
* @since 3.0.0
* @access protected
* @var array
*/
protected
$
global_groups
=
array
();
/**
* The blog prefix to prepend to keys in non-global groups.
*
* @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
*
* @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
*/
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
);
}
/**
* Sets the list of global cache groups.
*
* @since 3.0.0
* @access public
*
* @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
);
}
/**
* Decrements numeric cache item's value.
*
* @since 3.3.0
* @access public
*
* @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.
*/
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
];
}
/**
* Removes 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
* @access public
*
* @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.
*/
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
;
}
/**
* Clears the object cache of all data.
*
* @since 2.0.0
* @access public
*
* @return true Always returns true.
*/
public
function
flush
() {
$
this
->
cache
=
array
();
return
true
;
}
/**
* 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
* @access public
*
* @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.
*/
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
;
}
/**
* Increments numeric cache item's value.
*
* @since 3.3.0
* @access public
*
* @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.
*/
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
];
}
/**
* 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 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.
*/
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
);
}
/**
* Resets cache keys.
*
* @since 3.0.0
* @access public
*
* @deprecated 3.5.0 Use switch_to_blog()
* @see switch_to_blog()
*/
public
function
reset
() {
_deprecated_function
(
__FUNCTION__
,
'
3.5.0
'
,
'
switch_to_blog()
'
);
// Clear out non-global caches since the blog ID has changed.
foreach
(
array_keys
(
$
this
->
cache
)
as
$
group
) {
if
( !
isset
(
$
this
->
global_groups
[
$
group
] ) )
unset(
$
this
->
cache
[
$
group
] );
}
}
/**
* Sets the data contents into the cache.
*
* The cache contents is grouped by the $group parameter followed by the
* $key. This allows for duplicate ids in unique groups. Therefore, naming of
* the group should be used with care and should follow normal function
* naming guidelines outside of core WordPress usage.
*
* The $expire parameter is not used, because the cache will automatically
* expire for each time a page is accessed and PHP finishes. The method is
* more for cache plugins which use files.
*
* @since 2.0.0
* @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 Optional. Where to group the cache contents. Default 'default'.
* @param int $expire Not Used.
* @return true Always returns true.
*/
public
function
set
(
$
key
,
$
data
,
$
group
=
'
default
'
,
$
expire
=
0
) {
if
(
empty
(
$
group
) )
$
group
=
'
default
'
;
if
(
$
this
->
multisite
&& !
isset
(
$
this
->
global_groups
[
$
group
] ) )
$
key
=
$
this
->
blog_prefix
.
$
key
;
if
(
is_object
(
$
data
) )
$
data
=
clone
$
data
;
$
this
->
cache
[
$
group
][
$
key
] =
$
data
;
return
true
;
}
/**
* Echoes the stats of the caching.
*
* Gives the cache hits, and cache misses. Also prints every cached group,
* key and the data.
*
* @since 2.0.0
* @access public
*/
public
function
stats
() {
echo
"
<p>
"
;
echo
"
<strong>Cache Hits:</strong>
{
$
this
->
cache_hits
}
<br />
"
;
echo
"
<strong>Cache Misses:</strong>
{
$
this
->
cache_misses
}
<br />
"
;
echo
"
</p>
"
;
echo
'
<ul>
'
;
foreach
(
$
this
->
cache
as
$
group
=>
$
cache
) {
echo
"
<li><strong>Group:</strong>
$
group
- (
"
.
number_format
(
strlen
(
serialize
(
$
cache
) ) /
KB_IN_BYTES
,
2
) .
'
k )</li>
'
;
}
echo
'
</ul>
'
;
}
/**
* Switches the internal blog ID.
*
* This changes the blog ID used to create keys in blog specific groups.
*
* @since 3.5.0
* @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
*/
public
function
__construct
() {
$
this
->
multisite
=
is_multisite
();
$
this
->
blog_prefix
=
$
this
->
multisite
?
get_current_blog_id
() .
'
:
'
:
''
;
/**
* @todo This should be moved to the PHP4 style constructor, PHP5
* already calls __destruct()
*/
register_shutdown_function
(
array
(
$
this
,
'
__destruct
'
) );
}
/**
* Saves the object cache before object is completely destroyed.
*
* Called upon object destruction, which should be when PHP ends.
*
* @since 2.0.8
*
* @return true Always returns true.
*/
public
function
__destruct
() {
return
true
;
}
}
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