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<?php
/**
* Adds a value to cache.
*
* If the specified key already exists, the value is not stored and the function
* returns false.
*
* @link https://www.php.net/manual/en/memcached.add.php
*
* @param string $key The key under which to store the value.
* @param mixed $value The value to store.
* @param string $group The group value appended to the $key.
* @param int $expiration The expiration time, defaults to 0.
* @return bool True on success, false on failure.
*/
function
wp_cache_add
(
$
key
,
$
value
,
$
group
=
''
,
$
expiration
=
0
) {
global
$
wp_object_cache
;
return
$
wp_object_cache
->
add
(
$
key
,
$
value
,
$
group
,
$
expiration
);
}
/**
* Adds a value to cache on a specific server.
*
* Using a server_key value, the object can be stored on a specified server as opposed
* to a random server in the stack. Note that this method will add the key/value to the
* _cache object as part of the runtime cache. It will add it to an array for the
* specified server_key.
*
* @link https://www.php.net/manual/en/memcached.addbykey.php
*
* @param string $server_key The key identifying the server to store the value on.
* @param string $key The key under which to store the value.
* @param mixed $value The value to store.
* @param string $group The group value appended to the $key.
* @param int $expiration The expiration time, defaults to 0.
* @return bool True on success, false on failure.
*/
function
wp_cache_add_by_key
(
$
server_key
,
$
key
,
$
value
,
$
group
=
''
,
$
expiration
=
0
) {
global
$
wp_object_cache
;
return
$
wp_object_cache
->
addByKey
(
$
server_key
,
$
key
,
$
value
,
$
group
,
$
expiration
);
}
/**
* Adds a single server to the list of Memcached servers.
*
* @link https://www.php.net/manual/en/memcached.addserver.php
*
* @param string $host The hostname of the memcache server.
* @param int $port The port on which memcache is running.
* @param int $weight The weight of the server relative to the total weight
* of all the servers in the pool.
* @return bool True on success, false on failure.
*/
function
wp_cache_add_server
(
$
host
,
$
port
,
$
weight
=
0
) {
global
$
wp_object_cache
;
return
$
wp_object_cache
->
addServer
(
$
host
,
$
port
,
$
weight
);
}
/**
* Adds an array of servers to the pool.
*
* Each individual server in the array must include a domain and port, with an optional
* weight value: $servers = array( array( '127.0.0.1', 11211, 0 ) );
*
* @link https://www.php.net/manual/en/memcached.addservers.php
*
* @param array $servers Array of server to register.
* @return bool True on success, false on failure.
*/
function
wp_cache_add_servers
(
$
servers
) {
global
$
wp_object_cache
;
return
$
wp_object_cache
->
addServers
(
$
servers
);
}
/**
* Appends data to an existing item.
*
* This method should throw an error if it is used with compressed data.
* This is an expected behavior. Memcached casts the value to be appended to the initial value
* to the type of the initial value. Be careful as this leads to unexpected behavior at times.
* Due to how memcached treats types, the behavior has been mimicked in the internal cache to produce
* similar results and improve consistency. It is recommended that appends only occur with data of
* the same type.
*
* @link https://www.php.net/manual/en/memcached.append.php
*
* @param string $key The key under which to store the value.
* @param mixed $value Must be string as appending mixed values is not well-defined.
* @param string $group The group value appended to the $key.
* @return bool True on success, false on failure.
*/
function
wp_cache_append
(
$
key
,
$
value
,
$
group
=
''
) {
global
$
wp_object_cache
;
return
$
wp_object_cache
->
append
(
$
key
,
$
value
,
$
group
);
}
/**
* Appends data to an existing item by server key.
*
* This method should throw an error if it is used with compressed data.
* This is an expected behavior. Memcached casts the value to be appended to the initial value
* to the type of the initial value. Be careful as this leads to unexpected behavior at times.
* Due to how memcached treats types, the behavior has been mimicked in the internal cache to produce
* similar results and improve consistency. It is recommended that appends only occur with data of
* the same type.
*
* @link https://www.php.net/manual/en/memcached.appendbykey.php
*
* @param string $server_key The key identifying the server to store the value on.
* @param string $key The key under which to store the value.
* @param mixed $value Must be string as appending mixed values is not well-defined.
* @param string $group The group value appended to the $key.
* @return bool True on success, false on failure.
*/
function
wp_cache_append_by_key
(
$
server_key
,
$
key
,
$
value
,
$
group
=
''
) {
global
$
wp_object_cache
;
return
$
wp_object_cache
->
appendByKey
(
$
server_key
,
$
key
,
$
value
,
$
group
);
}
/**
* Performs a "check and set" to store data.
*
* The set will be successful only if the no other request has updated the value
* since it was fetched by this request.
*
* @link https://www.php.net/manual/en/memcached.cas.php
*
* @param float $cas_token Unique value associated with the existing item. Generated by memcached.
* @param string $key The key under which to store the value.
* @param mixed $value The value to store.
* @param string $group The group value appended to the $key.
* @param int $expiration The expiration time, defaults to 0.
* @return bool True on success, false on failure.
*/
function
wp_cache_cas
(
$
cas_token
,
$
key
,
$
value
,
$
group
=
''
,
$
expiration
=
0
) {
global
$
wp_object_cache
;
return
$
wp_object_cache
->
cas
(
$
cas_token
,
$
key
,
$
value
,
$
group
,
$
expiration
);
}
/**
* Performs a "check and set" to store data with a server key.
*
* The set will be successful only if the no other request has updated the value
* since it was fetched by this request.
*
* @link https://www.php.net/manual/en/memcached.casbykey.php
*
* @param string $server_key The key identifying the server to store the value on.
* @param float $cas_token Unique value associated with the existing item. Generated by memcached.
* @param string $key The key under which to store the value.
* @param mixed $value The value to store.
* @param string $group The group value appended to the $key.
* @param int $expiration The expiration time, defaults to 0.
* @return bool True on success, false on failure.
*/
function
wp_cache_cas_by_key
(
$
cas_token
,
$
server_key
,
$
key
,
$
value
,
$
group
=
''
,
$
expiration
=
0
) {
global
$
wp_object_cache
;
return
$
wp_object_cache
->
casByKey
(
$
cas_token
,
$
server_key
,
$
key
,
$
value
,
$
group
,
$
expiration
);
}
/**
* 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
;
}
/**
* Decrements a numeric item's value.
*
* @link https://www.php.net/manual/en/memcached.decrement.php
*
* @param string $key The key under which to store the value.
* @param int $offset The amount by which to decrement the item's value.
* @param string $group The group value appended to the $key.
* @return int|bool Item's new value on success, false on failure.
*/
function
wp_cache_decrement
(
$
key
,
$
offset
=
1
,
$
group
=
''
) {
global
$
wp_object_cache
;
return
$
wp_object_cache
->
decrement
(
$
key
,
$
offset
,
$
group
);
}
/**
* Decrements a numeric item's value.
*
* This is the same as wp_cache_decrement(), but kept for backward compatibility.
* The original WordPress caching backends use wp_cache_decr().
*
* @link https://www.php.net/manual/en/memcached.decrement.php
*
* @param string $key The key under which to store the value.
* @param int $offset The amount by which to decrement the item's value.
* @param string $group The group value appended to the $key.
* @return int|bool Item's new value on success, false on failure.
*/
function
wp_cache_decr
(
$
key
,
$
offset
=
1
,
$
group
=
''
) {
return
wp_cache_decrement
(
$
key
,
$
offset
,
$
group
);
}
/**
* Removes the item from the cache.
*
* Removes an item from memcached with identified by $key after $time seconds.
* The $time parameter allows an object to be queued for deletion without
* immediately deleting. Between the time that it is queued and the time it's deleted,
* add, replace, and get will fail, but set will succeed.
*
* @link https://www.php.net/manual/en/memcached.delete.php
*
* @param string $key The key under which to store the value.
* @param string $group The group value appended to the $key.
* @param int $time The amount of time the server will wait to delete the item in seconds.
* @return bool True on success, false on failure.
*/
function
wp_cache_delete
(
$
key
,
$
group
=
''
,
$
time
=
0
) {
global
$
wp_object_cache
;
return
$
wp_object_cache
->
delete
(
$
key
,
$
group
,
$
time
);
}
/**
* Removes the item from the cache by server key.
*
* Removes an item from memcached with identified by $key after $time seconds.
* The $time parameter allows an object to be queued for deletion without
* immediately deleting. Between the time that it is queued and the time it's deleted,
* add, replace, and get will fail, but set will succeed.
*
* @link https://www.php.net/manual/en/memcached.deletebykey.php
*
* @param string $server_key The key identifying the server to store the value on.
* @param string $key The key under which to store the value.
* @param string $group The group value appended to the $key.
* @param int $time The amount of time the server will wait to delete the item in seconds.
* @return bool True on success, false on failure.
*/
function
wp_cache_delete_by_key
(
$
server_key
,
$
key
,
$
group
=
''
,
$
time
=
0
) {
global
$
wp_object_cache
;
return
$
wp_object_cache
->
deleteByKey
(
$
server_key
,
$
key
,
$
group
,
$
time
);
}
/**
* Fetches the next result.
*
* @link https://www.php.net/manual/en/memcached.fetch.php
*
* @return array|false The next result on success, false on failure.
*/
function
wp_cache_fetch
() {
global
$
wp_object_cache
;
return
$
wp_object_cache
->
fetch
();
}
/**
* Fetches all remaining results from the last request.
*
* @link https://www.php.net/manual/en/memcached.fetchall.php
*
* @return array|false The results on success, false on failure.
*/
function
wp_cache_fetch_all
() {
global
$
wp_object_cache
;
return
$
wp_object_cache
->
fetchAll
();
}
/**
* Invalidates all items in the cache.
*
* @link https://www.php.net/manual/en/memcached.flush.php
*
* @param int $delay Number of seconds to wait before invalidating the items.
* @return bool True on success, false on failure.
*/
function
wp_cache_flush
(
$
delay
=
0
) {
global
$
wp_object_cache
;
return
$
wp_object_cache
->
flush
(
$
delay
);
}
/**
* Retrieves object from cache.
*
* Gets an object from cache based on $key and $group. In order to fully support
* the $cache_cb and $cas_token parameters, the runtime cache is ignored by this function
* if either of those values are set. In that case, the request is made directly
* to the memcached server for proper handling of the callback and/or token.
*
* Note that the $deprecated and $found args are only here for compatibility
* with the native wp_cache_get() function.
*
* @link https://www.php.net/manual/en/memcached.get.php
*
* @param string $key The key under which to store the value.
* @param string $group The group value appended to the $key.
* @param bool $force Whether or not to force a cache invalidation.
* @param null|bool $found Variable passed by reference to determine if the value was found or not.
* @param null|string $cache_cb Read-through caching callback.
* @param null|float $cas_token The variable to store the CAS token in.
* @return bool|mixed Cached object value.
*/
function
wp_cache_get
(
$
key
,
$
group
=
''
,
$
force
=
false
, &
$
found
=
null
,
$
cache_cb
=
null
, &
$
cas_token
=
null
) {
global
$
wp_object_cache
;
if
(
func_num_args
() >
4
) {
return
$
wp_object_cache
->
get
(
$
key
,
$
group
,
$
force
,
$
found
,
''
,
false
,
$
cache_cb
,
$
cas_token
);
}
else
{
return
$
wp_object_cache
->
get
(
$
key
,
$
group
,
$
force
,
$
found
);
}
}
/**
* Retrieves object from cache from specified server.
*
* Gets an object from cache based on $key, $group, and $server_key. In order to fully support
* the $cache_cb and $cas_token parameters, the runtime cache is ignored by this function
* if either of those values are set. In that case, the request is made directly
* to the memcached server for proper handling of the callback and/or token.
*
* @link https://www.php.net/manual/en/memcached.getbykey.php
*
* @param string $server_key The key identifying the server to store the value on.
* @param string $key The key under which to store the value.
* @param string $group The group value appended to the $key.
* @param bool $force Whether or not to force a cache invalidation.
* @param null|bool $found Variable passed by reference to determine if the value was found or not.
* @param null|string $cache_cb Read-through caching callback.
* @param null|float $cas_token The variable to store the CAS token in.
* @return bool|mixed Cached object value.
*/
function
wp_cache_get_by_key
(
$
server_key
,
$
key
,
$
group
=
''
,
$
force
=
false
, &
$
found
=
null
,
$
cache_cb
=
null
, &
$
cas_token
=
null
) {
global
$
wp_object_cache
;
if
(
func_num_args
() >
5
) {
return
$
wp_object_cache
->
getByKey
(
$
server_key
,
$
key
,
$
group
,
$
force
,
$
found
,
$
cache_cb
,
$
cas_token
);
}
else
{
return
$
wp_object_cache
->
getByKey
(
$
server_key
,
$
key
,
$
group
,
$
force
,
$
found
);
}
}
/**
* Requests multiple keys without blocking.
*
* @link https://www.php.net/manual/en/memcached.getdelayed.php
*
* @param string|array $keys Array or string of key(s) to request.
* @param string|array $groups Array or string of group(s) for the key(s).
* See buildKeys for more on how these are handled.
* @param bool $with_cas Whether to request CAS token values also.
* @param null $value_cb The result callback or null.
* @return bool True on success, false on failure.
*/
function
wp_cache_get_delayed
(
$
keys
,
$
groups
=
''
,
$
with_cas
=
false
,
$
value_cb
=
null
) {
global
$
wp_object_cache
;
return
$
wp_object_cache
->
getDelayed
(
$
keys
,
$
groups
,
$
with_cas
,
$
value_cb
);
}
/**
* Requests multiple keys without blocking from a specified server.
*
* @link https://www.php.net/manual/en/memcached.getdelayed.php
*
* @param string $server_key The key identifying the server to store the value on.
* @param string|array $keys Array or string of key(s) to request.
* @param string|array $groups Array or string of group(s) for the key(s).
* See buildKeys for more on how these are handled.
* @param bool $with_cas Whether to request CAS token values also.
* @param null $value_cb The result callback or null.
* @return bool True on success, false on failure.
*/
function
wp_cache_get_delayed_by_key
(
$
server_key
,
$
keys
,
$
groups
=
''
,
$
with_cas
=
false
,
$
value_cb
=
null
) {
global
$
wp_object_cache
;
return
$
wp_object_cache
->
getDelayedByKey
(
$
server_key
,
$
keys
,
$
groups
,
$
with_cas
,
$
value_cb
);
}
/**
* Gets multiple values from memcached in one request.
*
* See the buildKeys method definition to understand the $keys/$groups parameters.
*
* @link https://www.php.net/manual/en/memcached.getmulti.php
*
* @param array $keys Array of keys to retrieve.
* @param string|array $groups If string, used for all keys.
* If arrays, corresponds with the $keys array.
* @param null|array $cas_tokens The variable to store the CAS tokens for the found items.
* @param int $flags The flags for the get operation.
* @return bool|array The array of found items on success, false on failure.
*/
function
wp_cache_get_multi
(
$
keys
,
$
groups
=
''
, &
$
cas_tokens
=
null
,
$
flags
=
null
) {
global
$
wp_object_cache
;
if
(
func_num_args
() >
2
) {
return
$
wp_object_cache
->
getMulti
(
$
keys
,
$
groups
,
''
,
$
cas_tokens
,
$
flags
);
}
else
{
return
$
wp_object_cache
->
getMulti
(
$
keys
,
$
groups
);
}
}
/**
* Gets multiple values from memcached in one request by specified server key.
*
* See the buildKeys method definition to understand the $keys/$groups parameters.
*
* @link https://www.php.net/manual/en/memcached.getmultibykey.php
*
* @param string $server_key The key identifying the server to store the value on.
* @param array $keys Array of keys to retrieve.
* @param string|array $groups If string, used for all keys.
* If arrays, corresponds with the $keys array.
* @param null|array $cas_tokens The variable to store the CAS tokens for the found items.
* @param int $flags The flags for the get operation.
* @return bool|array The array of found items on success, false on failure.
*/
function
wp_cache_get_multi_by_key
(
$
server_key
,
$
keys
,
$
groups
=
''
, &
$
cas_tokens
=
null
,
$
flags
=
null
) {
global
$
wp_object_cache
;
if
(
func_num_args
() >
3
) {
return
$
wp_object_cache
->
getMultiByKey
(
$
server_key
,
$
keys
,
$
groups
,
$
cas_tokens
,
$
flags
);
}
else
{
return
$
wp_object_cache
->
getMultiByKey
(
$
server_key
,
$
keys
,
$
groups
);
}
}
/**
* Retrieves a Memcached option value.
*
* @link https://www.php.net/manual/en/memcached.getoption.php
*
* @param int $option One of the Memcached::OPT_* constants.
* @return mixed The value of the requested option on success, false on failure.
*/
function
wp_cache_get_option
(
$
option
) {
global
$
wp_object_cache
;
return
$
wp_object_cache
->
getOption
(
$
option
);
}
/**
* Returns the result code of the last option.
*
* @link https://www.php.net/manual/en/memcached.getresultcode.php
*
* @return int Result code of the last Memcached operation.
*/
function
wp_cache_get_result_code
() {
global
$
wp_object_cache
;
return
$
wp_object_cache
->
getResultCode
();
}
/**
* Return the message describing the result of the last operation.
*
* @link https://www.php.net/manual/en/memcached.getresultmessage.php
*
* @return string Message describing the result of the last Memcached operation.
*/
function
wp_cache_get_result_message
() {
global
$
wp_object_cache
;
return
$
wp_object_cache
->
getResultMessage
();
}
/**
* Gets server information by key.
*
* @link https://www.php.net/manual/en/memcached.getserverbykey.php
*
* @param string $server_key The key identifying the server to store the value on.
* @return array Array with host, post, and weight on success, fales on failure.
*/
function
wp_cache_get_server_by_key
(
$
server_key
) {
global
$
wp_object_cache
;
return
$
wp_object_cache
->
getServerByKey
(
$
server_key
);
}
/**
* Gets the list of servers in the pool.
*
* @link https://www.php.net/manual/en/memcached.getserverlist.php
*
* @return array The list of all servers in the server pool.
*/
function
wp_cache_get_server_list
() {
global
$
wp_object_cache
;
return
$
wp_object_cache
->
getServerList
();
}
/**
* Gets server pool statistics.
*
* @link https://www.php.net/manual/en/memcached.getstats.php
*
* @return array Array of server statistics, one entry per server.
*/
function
wp_cache_get_stats
() {
global
$
wp_object_cache
;
return
$
wp_object_cache
->
getStats
();
}
/**
* Gets server pool memcached version information.
*
* @link https://www.php.net/manual/en/memcached.getversion.php
*
* @return array Array of server versions, one entry per server.
*/
function
wp_cache_get_version
() {
global
$
wp_object_cache
;
return
$
wp_object_cache
->
getVersion
();
}
/**
* Increments a numeric item's value.
*
* @link https://www.php.net/manual/en/memcached.increment.php
*
* @param string $key The key under which to store the value.
* @param int $offset The amount by which to increment the item's value.
* @param string $group The group value appended to the $key.
* @return int|bool Item's new value on success, false on failure.
*/
function
wp_cache_increment
(
$
key
,
$
offset
=
1
,
$
group
=
''
) {
global
$
wp_object_cache
;
return
$
wp_object_cache
->
increment
(
$
key
,
$
offset
,
$
group
);
}
/**
* Increments a numeric item's value.
*
* This is the same as wp_cache_increment(), but kept for backward compatibility.
* The original WordPress caching backends use wp_cache_incr().
*
* @link https://www.php.net/manual/en/memcached.increment.php
*
* @param string $key The key under which to store the value.
* @param int $offset The amount by which to increment the item's value.
* @param string $group The group value appended to the $key.
* @return int|bool Item's new value on success, false on failure.
*/
function
wp_cache_incr
(
$
key
,
$
offset
=
1
,
$
group
=
''
) {
return
wp_cache_increment
(
$
key
,
$
offset
,
$
group
);
}
/**
* Prepends data to an existing item.
*
* This method should throw an error if it is used with compressed data. This is an expected behavior.
* Memcached casts the value to be prepended to the initial value to the type of the initial value.
* Be careful as this leads to unexpected behavior at times. For instance, prepending (float) 45.23
* to (int) 23 will result in 45, because the value is first combined (45.2323) then cast to "integer"
* (the original value), which will be (int) 45. Due to how memcached treats types, the behavior has been
* mimicked in the internal cache to produce similar results and improve consistency. It is recommended
* that prepends only occur with data of the same type.
*
* @link https://www.php.net/manual/en/memcached.prepend.php
*
* @param string $key The key under which to store the value.
* @param string $value Must be string as prepending mixed values is not well-defined.
* @param string $group The group value prepended to the $key.
* @return bool True on success, false on failure.
*/
function
wp_cache_prepend
(
$
key
,
$
value
,
$
group
=
''
) {
global
$
wp_object_cache
;
return
$
wp_object_cache
->
prepend
(
$
key
,
$
value
,
$
group
);
}
/**
* Appends data to an existing item by server key.
*
* This method should throw an error if it is used with compressed data. This is an expected behavior.
* Memcached casts the value to be prepended to the initial value to the type of the initial value.
* Be careful as this leads to unexpected behavior at times. For instance, prepending (float) 45.23
* to (int) 23 will result in 45, because the value is first combined (45.2323) then cast to "integer"
* (the original value), which will be (int) 45. Due to how memcached treats types, the behavior has been
* mimicked in the internal cache to produce similar results and improve consistency. It is recommended
* that prepends only occur with data of the same type.
*
* @link https://www.php.net/manual/en/memcached.prependbykey.php
*
* @param string $server_key The key identifying the server to store the value on.
* @param string $key The key under which to store the value.
* @param string $value Must be string as prepending mixed values is not well-defined.
* @param string $group The group value prepended to the $key.
* @return bool True on success, false on failure.
*/
function
wp_cache_prepend_by_key
(
$
server_key
,
$
key
,
$
value
,
$
group
=
''
) {
global
$
wp_object_cache
;
return
$
wp_object_cache
->
prependByKey
(
$
server_key
,
$
key
,
$
value
,
$
group
);
}
/**
* Replaces a value in cache.
*
* This method is similar to "add"; however, is does not successfully set a value
* if the object's key is not already set in cache.
*
* @link https://www.php.net/manual/en/memcached.replace.php
*
* @param string $key The key under which to store the value.
* @param mixed $value The value to store.
* @param string $group The group value appended to the $key.
* @param int $expiration The expiration time, defaults to 0.
* @return bool True on success, false on failure.
*/
function
wp_cache_replace
(
$
key
,
$
value
,
$
group
=
''
,
$
expiration
=
0
) {
global
$
wp_object_cache
;
return
$
wp_object_cache
->
replace
(
$
key
,
$
value
,
$
group
,
$
expiration
);
}
/**
* Replaces a value in cache on a specific server.
*
* This method is similar to "addByKey"; however, is does not successfully set a value
* if the object's key is not already set in cache.
*
* @link https://www.php.net/manual/en/memcached.addbykey.php
*
* @param string $server_key The key identifying the server to store the value on.
* @param string $key The key under which to store the value.
* @param mixed $value The value to store.
* @param string $group The group value appended to the $key.
* @param int $expiration The expiration time, defaults to 0.
* @return bool True on success, false on failure.
*/
function
wp_cache_replace_by_key
(
$
server_key
,
$
key
,
$
value
,
$
group
=
''
,
$
expiration
=
0
) {
global
$
wp_object_cache
;
return
$
wp_object_cache
->
replaceByKey
(
$
server_key
,
$
key
,
$
value
,
$
group
,
$
expiration
);
}
/**
* Sets a value in cache.
*
* The value is set whether or not this key already exists in memcached.
*
* @link https://www.php.net/manual/en/memcached.set.php
*
* @param string $key The key under which to store the value.
* @param mixed $value The value to store.
* @param string $group The group value appended to the $key.
* @param int $expiration The expiration time, defaults to 0.
* @return bool True on success, false on failure.
*/
function
wp_cache_set
(
$
key
,
$
value
,
$
group
=
''
,
$
expiration
=
0
) {
global
$
wp_object_cache
;
return
$
wp_object_cache
->
set
(
$
key
,
$
value
,
$
group
,
$
expiration
);
}
/**
* Sets a value in cache.
*
* The value is set whether or not this key already exists in memcached.
*
* @link https://www.php.net/manual/en/memcached.set.php
*
* @param string $server_key The key identifying the server to store the value on.
* @param string $key The key under which to store the value.
* @param mixed $value The value to store.
* @param string $group The group value appended to the $key.
* @param int $expiration The expiration time, defaults to 0.
* @return bool True on success, false on failure.
*/
function
wp_cache_set_by_key
(
$
server_key
,
$
key
,
$
value
,
$
group
=
''
,
$
expiration
=
0
) {
global
$
wp_object_cache
;
return
$
wp_object_cache
->
setByKey
(
$
server_key
,
$
key
,
$
value
,
$
group
,
$
expiration
);
}
/**
* Sets multiple values to cache at once.
*
* By sending an array of $items to this function, all values are saved at once to
* memcached, reducing the need for multiple requests to memcached. The $items array
* keys and values are what are stored to memcached. The keys in the $items array
* are merged with the $groups array/string value via buildKeys to determine the
* final key for the object.
*
* @param array $items An array of key/value pairs to store on the server.
* @param string|array $groups Group(s) to merge with key(s) in $items.
* @param int $expiration The expiration time, defaults to 0.
* @return bool True on success, false on failure.
*/
function
wp_cache_set_multi
(
$
items
,
$
groups
=
''
,
$
expiration
=
0
) {
global
$
wp_object_cache
;
return
$
wp_object_cache
->
setMulti
(
$
items
,
$
groups
,
$
expiration
);
}
/**
* Sets multiple values to cache at once on specified server.
*
* By sending an array of $items to this function, all values are saved at once to
* memcached, reducing the need for multiple requests to memcached. The $items array
* keys and values are what are stored to memcached. The keys in the $items array
* are merged with the $groups array/string value via buildKeys to determine the
* final key for the object.
*
* @param string $server_key The key identifying the server to store the value on.
* @param array $items An array of key/value pairs to store on the server.
* @param string|array $groups Group(s) to merge with key(s) in $items.
* @param int $expiration The expiration time, defaults to 0.
* @return bool True on success, false on failure.
*/
function
wp_cache_set_multi_by_key
(
$
server_key
,
$
items
,
$
groups
=
'
default
'
,
$
expiration
=
0
) {
global
$
wp_object_cache
;
return
$
wp_object_cache
->
setMultiByKey
(
$
server_key
,
$
items
,
$
groups
,
$
expiration
);
}
/**
* Sets a Memcached option.
*
* @link https://www.php.net/manual/en/memcached.setoption.php
*
* @param int $option Option name.
* @param mixed $value Option value.
* @return bool True on success, false on failure.
*/
function
wp_cache_set_option
(
$
option
,
$
value
) {
global
$
wp_object_cache
;
return
$
wp_object_cache
->
setOption
(
$
option
,
$
value
);
}
/**
* Switches blog prefix, which changes the cache that is accessed.
*
* @param int $blog_id Blog to switch to.
* @return void
*/
function
wp_cache_switch_to_blog
(
$
blog_id
) {
global
$
wp_object_cache
;
return
$
wp_object_cache
->
switch_to_blog
(
$
blog_id
);
}
/**
* Sets up Object Cache Global and assigns it.
*
* @global WP_Object_Cache $wp_object_cache WordPress Object Cache
* @return void
*/
function
wp_cache_init
() {
global
$
wp_object_cache
;
$
wp_object_cache
=
new
WP_Object_Cache
();
}
/**
* Adds a group or set of groups to the list of non-persistent groups.
*
* @param string|array $groups A group or an array of groups to add.
* @return void
*/
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-Memcached groups.
*
* @param string|array $groups A group or an array of groups to add.
* @return void
*/
function
wp_cache_add_non_persistent_groups
(
$
groups
) {
global
$
wp_object_cache
;
$
wp_object_cache
->
add_non_persistent_groups
(
$
groups
);
}
// phpcs:disable WordPress.NamingConventions.ValidFunctionName.MethodNameInvalid
class
WP_Object_Cache {
/**
* Holds the Memcached object.
*
* @var Memcached
*/
public
$
m
;
/**
* Hold the Memcached server details.
*
* @var array
*/
public
$
servers
;
/**
* Holds the non-Memcached objects.
*
* @var array
*/
public
$
cache
=
array
();
/**
* List of global groups.
*
* @var array
*/
public
$
global_groups
=
array
(
'
users
'
,
'
userlogins
'
,
'
usermeta
'
,
'
site-options
'
,
'
site-lookup
'
,
'
blog-lookup
'
,
'
blog-details
'
,
'
rss
'
);
/**
* List of groups not saved to Memcached.
*
* @var array
*/
public
$
no_mc_groups
=
array
(
'
comment
'
,
'
counts
'
);
/**
* Prefix used for global groups.
*
* @var string
*/
public
$
global_prefix
=
''
;
/**
* Prefix used for non-global groups.
*
* @var string
*/
public
$
blog_prefix
=
''
;
/**
* Instantiates the Memcached class.
*
* Instantiates the Memcached class and returns adds the servers specified
* in the $memcached_servers global array.
*
* @link https://www.php.net/manual/en/memcached.construct.php
*
* @param null $persistent_id To create an instance that persists between requests,
* use persistent_id to specify a unique ID for the instance.
*/
public
function
__construct
(
$
persistent_id
=
null
) {
global
$
memcached_servers
,
$
blog_id
,
$
table_prefix
;
if
(
is_null
(
$
persistent_id
) || !
is_string
(
$
persistent_id
) ) {
$
this
->
m
=
new
Memcached
();
}
else
{
$
this
->
m
=
new
Memcached
(
$
persistent_id
);
}
if
(
isset
(
$
memcached_servers
) ) {
$
this
->
servers
=
$
memcached_servers
;
}
else
{
$
this
->
servers
=
array
(
array
(
'
memcached
'
,
11211
) );
}
$
this
->
addServers
(
$
this
->
servers
);
/**
* This approach is borrowed from Sivel and Boren. Use the salt for easy cache invalidation
* and for multi single WP installations on the same server.
*/
if
( !
defined
(
'
WP_CACHE_KEY_SALT
'
) ) {
define
(
'
WP_CACHE_KEY_SALT
'
,
''
);
}
// Assign global and blog prefixes for use with keys.
if
(
function_exists
(
'
is_multisite
'
) ) {
$
this
->
global_prefix
= (
is_multisite
() ||
defined
(
'
CUSTOM_USER_TABLE
'
) &&
defined
(
'
CUSTOM_USER_META_TABLE
'
) ) ?
''
:
$
table_prefix
;
$
this
->
blog_prefix
= (
is_multisite
() ?
$
blog_id
:
$
table_prefix
) .
'
:
'
;
}
// Setup cacheable values for handling expiration times.
$
this
->
thirty_days
=
60
*
60
*
24
*
30
;
$
this
->
now
=
time
();
}
/**
* Adds a value to cache.
*
* If the specified key already exists, the value is not stored and the function
* returns false.
*
* @link https://www.php.net/manual/en/memcached.add.php
*
* @param string $key The key under which to store the value.
* @param mixed $value The value to store.
* @param string $group The group value appended to the $key.
* @param int $expiration The expiration time, defaults to 0.
* @param string $server_key The key identifying the server to store the value on.
* @param bool $by_key True to store in internal cache by key; false to not store by key.
* @return bool True on success, false on failure.
*/
public
function
add
(
$
key
,
$
value
,
$
group
=
'
default
'
,
$
expiration
=
0
,
$
server_key
=
''
,
$
by_key
=
false
) {
/*
* Ensuring that wp_suspend_cache_addition is defined before calling, because sometimes an advanced-cache.php
* file will load object-cache.php before wp-includes/functions.php is loaded. In those cases, if wp_cache_add
* is called in advanced-cache.php before any more of WordPress is loaded, we get a fatal error because
* wp_suspend_cache_addition will not be defined until wp-includes/functions.php is loaded.
*/
if
(
function_exists
(
'
wp_suspend_cache_addition
'
) &&
wp_suspend_cache_addition
() ) {
return
false
;
}
$
derived_key
=
$
this
->
buildKey
(
$
key
,
$
group
);
$
expiration
=
$
this
->
sanitize_expiration
(
$
expiration
);
// If group is a non-Memcached group, save to runtime cache, not Memcached.
if
(
in_array
(
$
group
,
$
this
->
no_mc_groups
,
true
) ) {
// Add does not set the value if the key exists; mimic that here.
if
(
isset
(
$
this
->
cache
[
$
derived_key
] ) ) {
return
false
;
}
$
this
->
add_to_internal_cache
(
$
derived_key
,
$
value
);
return
true
;
}
// Save to Memcached.
if
(
$
by_key
) {
$
result
=
$
this
->
m
->
addByKey
(
$
server_key
,
$
derived_key
,
$
value
,
$
expiration
);
}
else
{
$
result
=
$
this
->
m
->
add
(
$
derived_key
,
$
value
,
$
expiration
);
}
// Store in runtime cache if add was successful.
if
( Memcached::
RES_SUCCESS
===
$
this
->
getResultCode
() ) {
$
this
->
add_to_internal_cache
(
$
derived_key
,
$
value
);
}
return
$
result
;
}
/**
* Adds a value to cache on a specific server.
*
* Using a server_key value, the object can be stored on a specified server as opposed
* to a random server in the stack. Note that this method will add the key/value to the
* _cache object as part of the runtime cache. It will add it to an array for the
* specified server_key.
*
* @link https://www.php.net/manual/en/memcached.addbykey.php
*
* @param string $server_key The key identifying the server to store the value on.
* @param string $key The key under which to store the value.
* @param mixed $value The value to store.
* @param string $group The group value appended to the $key.
* @param int $expiration The expiration time, defaults to 0.
* @return bool True on success, false on failure.
*/
public
function
addByKey
(
$
server_key
,
$
key
,
$
value
,
$
group
=
'
default
'
,
$
expiration
=
0
) {
return
$
this
->
add
(
$
key
,
$
value
,
$
group
,
$
expiration
,
$
server_key
,
true
);
}
/**
* Adds a single server to the list of Memcached servers.
*
* @link https://www.php.net/manual/en/memcached.addserver.php
*
* @param string $host The hostname of the memcache server.
* @param int $port The port on which memcache is running.
* @param int $weight The weight of the server relative to the total weight
* of all the servers in the pool.
* @return bool True on success, false on failure.
*/
public
function
addServer
(
$
host
,
$
port
,
$
weight
=
0
) {
$
host
=
is_string
(
$
host
) ?
$
host
:
'
127.0.0.1
'
;
$
port
=
is_numeric
(
$
port
) &&
$
port
>
0
?
$
port
:
11211
;
$
weight
=
is_numeric
(
$
weight
) &&
$
weight
>
0
?
$
weight
:
1
;
return
$
this
->
m
->
addServer
(
$
host
,
$
port
,
$
weight
);
}
/**
* Adds an array of servers to the pool.
*
* Each individual server in the array must include a domain and port, with an optional
* weight value: $servers = array( array( '127.0.0.1', 11211, 0 ) );
*
* @link https://www.php.net/manual/en/memcached.addservers.php
*
* @param array $servers Array of server to register.
* @return bool True on success, false on failure.
*/
public
function
addServers
(
$
servers
) {
if
( !
is_object
(
$
this
->
m
) ) {
return
false
;
}
return
$
this
->
m
->
addServers
(
$
servers
);
}
/**
* Appends data to an existing item.
*
* This method should throw an error if it is used with compressed data.
* This is an expected behavior. Memcached casts the value to be appended to the initial value
* to the type of the initial value. Be careful as this leads to unexpected behavior at times.
* Due to how memcached treats types, the behavior has been mimicked in the internal cache to produce
* similar results and improve consistency. It is recommended that appends only occur with data of
* the same type.
*
* @link https://www.php.net/manual/en/memcached.append.php
*
* @param string $key The key under which to store the value.
* @param mixed $value Must be string as appending mixed values is not well-defined.
* @param string $group The group value appended to the $key.
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