<?php
/**
* Adds a value to cache.
*
* If the specified key already exists, the value is not stored and the function
* returns false.
*
* @link http://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 Returns TRUE on success or 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 http://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 Returns TRUE on success or 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 );
}
/**
* Add a single server to the list of Memcached servers.
*
* @link http://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 Returns TRUE on success or 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 http://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 );
}
/**
* Append 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 recommend that appends only occur with data of
* the same type.
*
* @link http://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 Returns TRUE on success or FALSE on failure.
*/
function wp_cache_append( $key, $value, $group = '' ) {
global $wp_object_cache;
return $wp_object_cache->append( $key, $value, $group );
}
/**
* Append 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 recommend that appends only occur with data of
* the same type.
*
* @link http://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 Returns TRUE on success or 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 http://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 Returns TRUE on success or 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 http://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 Returns TRUE on success or 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;
}
/**
* Decrement a numeric item's value.
*
* @link http://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 Returns item's new value on success or FALSE on failure.
*/
function wp_cache_decrement( $key, $offset = 1, $group = '' ) {
global $wp_object_cache;
return $wp_object_cache->decrement( $key, $offset, $group );
}
/**
* Decrement a numeric item's value.
*
* Same as wp_cache_decrement. Original WordPress caching backends use wp_cache_decr. I
* want both spellings to work.
*
* @link http://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 Returns item's new value on success or FALSE on failure.
*/
function wp_cache_decr( $key, $offset = 1, $group = '' ) {
return wp_cache_decrement( $key, $offset, $group );
}
/**
* Remove the item from the cache.
*
* Remove 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 http://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 Returns TRUE on success or FALSE on failure.
*/
function wp_cache_delete( $key, $group = '', $time = 0 ) {
global $wp_object_cache;
return $wp_object_cache->delete( $key, $group, $time );
}
/**
* Remove the item from the cache by server key.
*
* Remove 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 http://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 Returns TRUE on success or 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 );
}
/**
* Fetch the next result.
*
* @link http://www.php.net/manual/en/memcached.fetch.php
*
* @return array|bool Returns the next result or FALSE otherwise.
*/
function wp_cache_fetch() {
global $wp_object_cache;
return $wp_object_cache->fetch();
}
/**
* Fetch all remaining results from the last request.
*
* @link http://www.php.net/manual/en/memcached.fetchall.php
*
* @return array|bool Returns the results or FALSE on failure.
*/
function wp_cache_fetch_all() {
global $wp_object_cache;
return $wp_object_cache->fetchAll();
}
/**
* Invalidate all items in the cache.
*
* @link http://www.php.net/manual/en/memcached.flush.php
*
* @param int $delay Number of seconds to wait before invalidating the items.
* @return bool Returns TRUE on success or FALSE on failure.
*/
function wp_cache_flush( $delay = 0 ) {
global $wp_object_cache;
return $wp_object_cache->flush( $delay );
}
/**
* Retrieve 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. If either of
* those values are set, 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 http://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 );
}
/**
* Retrieve 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. If either of
* those values are set, the request is made directly to the memcached server for proper handling of the
* callback and/or token.
*
* @link http://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 );
}
/**
* Request multiple keys without blocking.
*
* @link http://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 Returns TRUE on success or 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 );
}
/**
* Request multiple keys without blocking from a specified server.
*
* @link http://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 Returns TRUE on success or 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 http://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 Returns the array of found items or 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 http://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 Returns the array of found items or 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 );
}
/**
* Retrieve a Memcached option value.
*
* @link http://www.php.net/manual/en/memcached.getoption.php
*
* @param int $option One of the Memcached::OPT_* constants.
* @return mixed Returns the value of the requested option, or FALSE on error.
*/
function wp_cache_get_option( $option ) {
global $wp_object_cache;
return $wp_object_cache->getOption( $option );
}
/**
* Return the result code of the last option.
*
* @link http://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 http://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();
}
/**
* Get server information by key.
*
* @link http://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, FALSE on failure.
*/
function wp_cache_get_server_by_key( $server_key ) {
global $wp_object_cache;
return $wp_object_cache->getServerByKey( $server_key );
}
/**
* Get the list of servers in the pool.
*
* @link http://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();
}
/**
* Get server pool statistics.
*
* @link http://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();
}
/**
* Get server pool memcached version information.
*
* @link http://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();
}
/**
* Increment a numeric item's value.
*
* @link http://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 Returns item's new value on success or FALSE on failure.
*/
function wp_cache_increment( $key, $offset = 1, $group = '' ) {
global $wp_object_cache;
return $wp_object_cache->increment( $key, $offset, $group );
}
/**
* Increment a numeric item's value.
*
* This is the same as wp_cache_increment, but kept for back compatibility. The original
* WordPress caching backends use wp_cache_incr. I want both to work.
*
* @link http://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 Returns item's new value on success or FALSE on failure.
*/
function wp_cache_incr( $key, $offset = 1, $group = '' ) {
return wp_cache_increment( $key, $offset, $group );
}
/**
* Prepend 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 recommend
* that prepends only occur with data of the same type.
*
* @link http://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 Returns TRUE on success or FALSE on failure.
*/
function wp_cache_prepend( $key, $value, $group = '' ) {
global $wp_object_cache;
return $wp_object_cache->prepend( $key, $value, $group );
}
/**
* Append 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 recommend
* that prepends only occur with data of the same type.
*
* @link http://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 Returns TRUE on success or 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 http://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 Returns TRUE on success or 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 http://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 Returns TRUE on success or 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 http://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 Returns TRUE on success or 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 http://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 Returns TRUE on success or 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 );
}
/**
* Set 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 Returns TRUE on success or FALSE on failure.
*/
function wp_cache_set_multi( $items, $groups = '', $expiration = 0 ) {
global $wp_object_cache;
return $wp_object_cache->setMulti( $items, $groups, $expiration );
}
/**
* Set 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 Returns TRUE on success or 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 );
}
/**
* Set a Memcached option.
*
* @link http://www.php.net/manual/en/memcached.setoption.php
*
* @param int $option Option name.
* @param mixed $value Option value.
* @return bool Returns TRUE on success or FALSE on failure.
*/
function wp_cache_set_option( $option, $value ) {
global $wp_object_cache;
return $wp_object_cache->setOption( $option, $value );
}
/**
* Switch 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 );
}
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 = '';
/**
* Instantiate the Memcached class.
*
* Instantiates the Memcached class and returns adds the servers specified
* in the $memcached_servers global array.
*
* @link http://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( '127.0.0.1', 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 installs 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 http://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 $byKey True to store in internal cache by key; false to not store by key
* @return bool Returns TRUE on success or FALSE on failure.
*/
public function add( $key, $value, $group = 'default', $expiration = 0, $server_key = '', $byKey = 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 ) ) {
// 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 ( $byKey )
$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 http://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 Returns TRUE on success or FALSE on failure.
*/
public function addByKey( $server_key, $key, $value, $group = 'default', $expiration = 0 ) {
return $this->add( $key, $value, $group, $expiration, $server_key, true );
}
/**
* Add a single server to the list of Memcached servers.
*
* @link http://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 Returns TRUE on success or 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 http://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 );
}
/**
* Append 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 recommend that appends only occur with data of
* the same type.
*
* @link http://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.
* @param string $server_key The key identifying the server to store the value on.
* @param bool $byKey True to store in internal cache by key; false to not store by key
* @return bool Returns TRUE on success or FALSE on failure.
*/
public function append( $key, $value, $group = 'default', $server_key = '', $byKey = false ) {
if ( ! is_string( $value ) && ! is_int( $value ) && ! is_float( $value ) )
return false;
$derived_key = $this->buildKey( $key, $group );
// If group is a non-Memcached group, append to runtime cache value, not Memcached
if ( in_array( $group, $this->no_mc_groups ) ) {
if ( ! isset( $this->cache[$derived_key] ) )
return false;
$combined = $this->combine_values( $this->cache[$derived_key], $value, 'app' );
$this->add_to_internal_cache( $derived_key, $combined );
return true;
}
// Append to Memcached value
if ( $byKey )
$result = $this->m->appendByKey( $server_key, $derived_key, $value );
else
$result = $this->m->append( $derived_key, $value );
// Store in runtime cache if add was successful
if ( Memcached::RES_SUCCESS === $this->getResultCode() ) {
$combined = $this->combine_values( $this->cache[$derived_key], $value, 'app' );
$this->add_to_internal_cache( $derived_key, $combined );
}
return $result;
}
/**
* Append 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 recommend that appends only occur with data of
* the same type.
*
* @link http://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 Returns TRUE on success or FALSE on failure.
*/
public function appendByKey( $server_key, $key, $value, $group = 'default' ) {
return $this->append( $key, $value, $group, $server_key, true );
}
/**
* 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 since
* this request.
*
* @link http://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.
* @param string $server_key The key identifying the server to store the value on.
* @param bool $byKey True to store in internal cache by key; false to not store by key
* @return bool Returns TRUE on success or FALSE on failure.
*/
public function cas( $cas_token, $key, $value, $group = 'default', $expiration = 0, $server_key = '', $byKey = 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. Note
* that since check and set cannot be emulated in the run time cache, this value
* operation is treated as a normal "add" for no_mc_groups.
*/
if ( in_array( $group, $this->no_mc_groups ) ) {
$this->add_to_internal_cache( $derived_key, $value );
return true;
}
// Save to Memcached
if ( $byKey )
$result = $this->m->casByKey( $cas_token, $server_key, $derived_key, $value, $expiration );
else
$result = $this->m->cas( $cas_token, $derived_key, $value, $expiration );
// Store in runtime cache if cas was successful
if ( Memcached::RES_SUCCESS === $this->getResultCode() )
$this->add_to_internal_cache( $derived_key, $value );
return $result;
}
/**
* 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 http://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 Returns TRUE on success or FALSE on failure.
*/
public function casByKey( $cas_token, $server_key, $key, $value, $group = 'default', $expiration = 0 ) {
return $this->cas( $cas_token, $key, $value, $group, $expiration, $server_key, true );
}
/**
* Decrement a numeric item's value.
*
* @link http://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 Returns item's new value on success or FALSE on failure.
*/
public function decrement( $key, $offset = 1, $group = 'default' ) {
$derived_key = $this->buildKey( $key, $group );
// Decrement values in no_mc_groups
if ( in_array( $group, $this->no_mc_groups ) ) {
// Only decrement if the key already exists and value is 0 or greater (mimics memcached behavior)
if ( isset( $this->cache[$derived_key] ) && $this->cache[$derived_key] >= 0 ) {
// If numeric, subtract; otherwise, consider it 0 and do nothing
if ( is_numeric( $this->cache[$derived_key] ) )
$this->cache[$derived_key] -= (int) $offset;
else
$this->cache[$derived_key] = 0;
// Returned value cannot be less than 0
if ( $this->cache[$derived_key] < 0 )
$this->cache[$derived_key] = 0;
return $this->cache[$derived_key];
} else {
return false;
}
}
$result = $this->m->decrement( $derived_key, $offset );
if ( Memcached::RES_SUCCESS === $this->getResultCode() )
$this->add_to_internal_cache( $derived_key, $result );
return $result;
}
/**
* Decrement a numeric item's value.
*
* Alias for $this->decrement. Other caching backends use this abbreviated form of the function. It *may* cause
* breakage somewhere, so it is nice to have. This function will also allow the core unit tests to pass.
*
* @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 Returns item's new value on success or FALSE on failure.
*/
public function decr( $key, $offset = 1, $group = 'default' ) {
return $this->decrement( $key, $offset, $group );
}
/**
* Remove the item from the cache.
*
* Remove 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 http://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.
* @param string $server_key The key identifying the server to store the value on.
* @param bool $byKey True to store in internal cache by key; false to not store by key
* @return bool Returns TRUE on success or FALSE on failure.
*/
public function delete( $key, $group = 'default', $time = 0, $server_key = '', $byKey = false ) {
$derived_key = $this->buildKey( $key, $group );
// Remove from no_mc_groups array
if ( in_array( $group, $this->no_mc_groups ) ) {
if ( isset( $this->cache[$derived_key] ) )
unset( $this->cache[$derived_key] );
return true;
}
if ( $byKey )
$result = $this->m->deleteByKey( $server_key, $derived_key, $time );
else
$result = $this->m->delete( $derived_key, $time );
if ( Memcached::RES_SUCCESS === $this->getResultCode() )
unset( $this->cache[$derived_key] );
return $result;
}
/**
* Remove the item from the cache by server key.
*
* Remove 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 http://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 Returns TRUE on success or FALSE on failure.
*/
public function deleteByKey( $server_key, $key, $group = 'default', $time = 0 ) {
return $this->delete( $key, $group, $time, $server_key, true );
}
/**
* Fetch the next result.
*
* @link http://www.php.net/manual/en/memcached.fetch.php
*
* @return array|bool Returns the next result or FALSE on failure.
*/
public function fetch() {
return $this->m->fetch();
}
/**
* Fetch all remaining results from the last request.
*
* @link http://www.php.net/manual/en/memcached.fetchall.php
*
* @return array|bool Returns the results or FALSE on failure.
*/
public function fetchAll() {
return $this->m->fetchAll();
}
/**
* Invalidate all items in the cache.
*
* @link http://www.php.net/manual/en/memcached.flush.php
*
* @param int $delay Number of seconds to wait before invalidating the items.
* @return bool Returns TRUE on success or FALSE on failure.
*/
public function flush( $delay = 0 ) {
$result = $this->m->flush( $delay );
// Only reset the runtime cache if memcached was properly flushed
if ( Memcached::RES_SUCCESS === $this->getResultCode() )
$this->cache = array();
return $result;
}
/**
* Retrieve 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. If either of
* those values are set, the request is made directly to the memcached server for proper handling of the
* callback and/or token. Note that the $cas_token variable cannot be directly passed to the function. The
* variable need to be first defined with a non null value.
*
* If using the $cache_cb argument, the new value will always have an expiration of time of 0 (forever). This
* is a limitation of the Memcached PECL extension.
*
* @link http://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 string $server_key The key identifying the server to store the value on.
* @param bool $byKey True to store in internal cache by key; false to not store by key
* @param null|callable $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.
*/
public function get( $key, $group = 'default', $force = false, &$found = null, $server_key = '', $byKey = false, $cache_cb = NULL, &$cas_token = NULL ) {
$derived_key = $this->buildKey( $key, $group );
// Assume object is not found
$found = false;
// If either $cache_db, or $cas_token is set, must hit Memcached and bypass runtime cache
if ( func_num_args() > 6 && ! in_array( $group, $this->no_mc_groups ) ) {
if ( $byKey )
$value = $this->m->getByKey( $server_key, $derived_key, $cache_cb, $cas_token );
else
$value = $this->m->get( $derived_key, $cache_cb, $cas_token );
} else {
if ( isset( $this->cache[$derived_key] ) ) {
$found = true;
return is_object( $this->cache[$derived_key] ) ? clone $this->cache[$derived_key] : $this->cache[$derived_key];
} elseif ( in_array( $group, $this->no_mc_groups ) ) {
return false;
} else {
if ( $byKey )
$value = $this->m->getByKey( $server_key, $derived_key );
else
$value = $this->m->get( $derived_key );
}
}
if ( Memcached::RES_SUCCESS === $this->getResultCode() ) {
$this->add_to_internal_cache( $derived_key, $value );
$found = true;
}
return is_object( $value ) ? clone $value : $value;
}
/**
* Retrieve 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. If either of
* those values are set, the request is made directly to the memcached server for proper handling of the
* callback and/or token. Note that the $cas_token variable cannot be directly passed to the function. The
* variable need to be first defined with a non null value.
*
* If using the $cache_cb argument, the new value will always have an expiration of time of 0 (forever). This
* is a limitation of the Memcached PECL extension.
*
* @link http://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.
*/
public function getByKey( $server_key, $key, $group = 'default', $force = false, &$found = null, $cache_cb = NULL, &$cas_token = NULL ) {
/**
* Need to be careful how "get" is called. If you send $cache_cb, and $cas_token, it will hit memcached.
* Only send those args if they were sent to this function.
*/
if ( func_num_args() > 5 )
return $this->get( $key, $group, $force, $found, $server_key, true, $cache_cb, $cas_token );
else
return $this->get( $key, $group, $force, $found, $server_key, true );
}
/**
* Request multiple keys without blocking.
*
* @link http://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 Returns TRUE on success or FALSE on failure.
*/
public function getDelayed( $keys, $groups = 'default', $with_cas = false, $value_cb = NULL ) {
$derived_keys = $this->buildKeys( $keys, $groups );
return $this->m->getDelayed( $derived_keys, $with_cas, $value_cb );
}
/**
* Request multiple keys without blocking from a specified server.
*
* @link http://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 Returns TRUE on success or FALSE on failure.
*/
public function getDelayedByKey( $server_key, $keys, $groups = 'default', $with_cas = false, $value_cb = NULL ) {
$derived_keys = $this->buildKeys( $keys, $groups );
return $this->m->getDelayedByKey( $server_key, $derived_keys, $with_cas, $value_cb );
}
/**
* Gets multiple values from memcached in one request.
*
* See the buildKeys method definition to understand the $keys/$groups parameters.
*
* @link http://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 string $server_key The key identifying the server to store the value on.
* @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 Returns the array of found items or FALSE on failure.
*/
public function getMulti( $keys, $groups = 'default', $server_key = '', &$cas_tokens = NULL, $flags = NULL ) {
$derived_keys = $this->buildKeys( $keys, $groups );
/**
* If either $cas_tokens, or $flags is set, must hit Memcached and bypass runtime cache. Note that
* this will purposely ignore no_mc_groups values as they cannot handle CAS tokens or the special
* flags; however, if the groups of groups contains a no_mc_group, this is bypassed.
*/
if ( func_num_args() > 3 && ! $this->contains_no_mc_group( $groups ) ) {
if ( ! empty( $server_key ) )
$values = $this->m->getMultiByKey( $server_key, $derived_keys, $cas_tokens, $flags );
else
$values = $this->m->getMulti( $derived_keys, $cas_tokens, $flags );
} else {
$values = array();
$need_to_get = array();
// Pull out values from runtime cache, or mark for retrieval
foreach ( $derived_keys as $key ) {
if ( isset( $this->cache[$key] ) )
$values[$key] = $this->cache[$key];
else
$need_to_get[$key] = $key;
}
// Get those keys not found in the runtime cache
if ( ! empty( $need_to_get ) ) {
if ( ! empty( $server_key ) )
$result = $this->m->getMultiByKey( $server_key, array_keys( $need_to_get ) );
else
$result = $this->m->getMulti( array_keys( $need_to_get ) );
}
// Merge with values found in runtime cache
if ( isset( $result ) && Memcached::RES_SUCCESS === $this->getResultCode() )
$values = array_merge( $values, $result );
// If order should be preserved, reorder now
if ( ! empty( $need_to_get ) && $flags === Memcached::GET_PRESERVE_ORDER ) {
$ordered_values = array();
foreach ( $derived_keys as $key ) {
if ( isset( $values[$key] ) )
$ordered_values[$key] = $values[$key];
}
$values = $ordered_values;
unset( $ordered_values );
}
}
// Add the values to the runtime cache
$this->cache = array_merge( $this->cache, $values );
return $values;
}
/**
* Gets multiple values from memcached in one request by specified server key.
*
* See the buildKeys method definition to understand the $keys/$groups parameters.
*
* @link http://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 Returns the array of found items or FALSE on failure.
*/
public function getMultiByKey( $server_key, $keys, $groups = 'default', &$cas_tokens = NULL, $flags = NULL ) {
/**
* Need to be careful how "getMulti" is called. If you send $cache_cb, and $cas_token, it will hit memcached.
* Only send those args if they were sent to this function.
*/
if ( func_num_args() > 3 )
return $this->getMulti( $keys, $groups, $server_key, $cas_tokens, $flags );
else
return $this->getMulti( $keys, $groups, $server_key );
}
/**
* Retrieve a Memcached option value.
*
* @link http://www.php.net/manual/en/memcached.getoption.php
*
* @param int $option One of the Memcached::OPT_* constants.
* @return mixed Returns the value of the requested option, or FALSE on error.
*/
public function getOption( $option ) {
return $this->m->getOption( $option );
}
/**
* Return the result code of the last option.
*
* @link http://www.php.net/manual/en/memcached.getresultcode.php
*
* @return int Result code of the last Memcached operation.
*/
public function getResultCode() {
return $this->m->getResultCode();
}
/**
* Return the message describing the result of the last operation.
*
* @link http://www.php.net/manual/en/memcached.getresultmessage.php
*
* @return string Message describing the result of the last Memcached operation.
*/
public function getResultMessage() {
return $this->m->getResultMessage();
}
/**
* Get server information by key.
*
* @link http://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, FALSE on failure.
*/
public function getServerByKey( $server_key ) {
return $this->m->getServerByKey( $server_key );
}
/**
* Get the list of servers in the pool.
*
* @link http://www.php.net/manual/en/memcached.getserverlist.php
*
* @return array The list of all servers in the server pool.
*/
public function getServerList() {
return $this->m->getServerList();
}
/**
* Get server pool statistics.
*
* @link http://www.php.net/manual/en/memcached.getstats.php
*
* @return array Array of server statistics, one entry per server.
*/
public function getStats() {
return $this->m->getStats();
}
/**
* Get server pool memcached version information.
*
* @link http://www.php.net/manual/en/memcached.getversion.php
*
* @return array Array of server versions, one entry per server.
*/
public function getVersion() {
return $this->m->getVersion();
}
/**
* Increment a numeric item's value.
*
* @link http://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 Returns item's new value on success or FALSE on failure.
*/
public function increment( $key, $offset = 1, $group = 'default' ) {
$derived_key = $this->buildKey( $key, $group );
// Increment values in no_mc_groups
if ( in_array( $group, $this->no_mc_groups ) ) {
// Only increment if the key already exists and the number is currently 0 or greater (mimics memcached behavior)
if ( isset( $this->cache[$derived_key] ) && $this->cache[$derived_key] >= 0 ) {
// If numeric, add; otherwise, consider it 0 and do nothing
if ( is_numeric( $this->cache[$derived_key] ) )
$this->cache[$derived_key] += (int) $offset;
else
$this->cache[$derived_key] = 0;
// Returned value cannot be less than 0
if ( $this->cache[$derived_key] < 0 )
$this->cache[$derived_key] = 0;
return $this->cache[$derived_key];
} else {
return false;
}
}
$result = $this->m->increment( $derived_key, $offset );
if ( Memcached::RES_SUCCESS === $this->getResultCode() )
$this->add_to_internal_cache( $derived_key, $result );
return $result;
}
/**
* Synonymous with $this->incr.
*
* Certain plugins expect an "incr" method on the $wp_object_cache object (e.g., Batcache). Since the original
* version of this library matched names to the memcached methods, the "incr" method was missing. Adding this
* method restores compatibility with plugins expecting an "incr" method.
*
* @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 Returns item's new value on success or FALSE on failure.
*/
public function incr( $key, $offset = 1, $group = 'default' ) {
return $this->increment( $key, $offset, $group );
}
/**
* Prepend 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 recommend
* that prepends only occur with data of the same type.
*
* @link http://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.
* @param string $server_key The key identifying the server to store the value on.
* @param bool $byKey True to store in internal cache by key; false to not store by key
* @return bool Returns TRUE on success or FALSE on failure.
*/
public function prepend( $key, $value, $group = 'default', $server_key = '', $byKey = false ) {
if ( ! is_string( $value ) && ! is_int( $value ) && ! is_float( $value ) )
return false;
$derived_key = $this->buildKey( $key, $group );
// If group is a non-Memcached group, prepend to runtime cache value, not Memcached
if ( in_array( $group, $this->no_mc_groups ) ) {
if ( ! isset( $this->cache[$derived_key] ) )
return false;
$combined = $this->combine_values( $this->cache[$derived_key], $value, 'pre' );
$this->add_to_internal_cache( $derived_key, $combined );
return true;
}
// Append to Memcached value
if ( $byKey )
$result = $this->m->prependByKey( $server_key, $derived_key, $value );
else
$result = $this->m->prepend( $derived_key, $value );
// Store in runtime cache if add was successful
if ( Memcached::RES_SUCCESS === $this->getResultCode() ) {
$combined = $this->combine_values( $this->cache[$derived_key], $value, 'pre' );
$this->add_to_internal_cache( $derived_key, $combined );
}
return $result;
}
/**
* Append 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 recommend
* that prepends only occur with data of the same type.
*
* @link http://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 Returns TRUE on success or FALSE on failure.
*/
public function prependByKey( $server_key, $key, $value, $group = 'default' ) {
return $this->prepend( $key, $value, $group, $server_key, true );
}
/**
* 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 http://www.php.net/manual/en/memcached.replace.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 bool $byKey True to store in internal cache by key; false to not store by key
* @param int $expiration The expiration time, defaults to 0.
* @return bool Returns TRUE on success or FALSE on failure.
*/
public function replace( $key, $value, $group = 'default', $expiration = 0, $server_key = '', $byKey = 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 ) ) {
// Replace won't save unless the key already exists; mimic this behavior here
if ( ! isset( $this->cache[$derived_key] ) )
return false;
$this->cache[$derived_key] = $value;
return true;
}
// Save to Memcached
if ( $byKey )
$result = $this->m->replaceByKey( $server_key, $derived_key, $value, $expiration );
else
$result = $this->m->replace( $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;
}
/**
* 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 http://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 Returns TRUE on success or FALSE on failure.
*/
public function replaceByKey( $server_key, $key, $value, $group = 'default', $expiration = 0 ) {
return $this->replace( $key, $value, $group, $expiration, $server_key, true );
}
/**
* Sets a value in cache.
*
* The value is set whether or not this key already exists in memcached.
*
* @link http://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.
* @param string $server_key The key identifying the server to store the value on.
* @param bool $byKey True to store in internal cache by key; false to not store by key
* @return bool Returns TRUE on success or FALSE on failure.
*/
public function set( $key, $value, $group = 'default', $expiration = 0, $server_key = '', $byKey = 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 ) ) {
$this->add_to_internal_cache( $derived_key, $value );
return true;
}
// Save to Memcached
if ( $byKey ) {
$result = $this->m->setByKey( $server_key, $derived_key, $value, $expiration );
} else {
$result = $this->m->set( $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;
}
/**
* Sets a value in cache on a specific server.
*
* The value is set whether or not this key already exists in memcached.
*
* @link http://www.php.net/manual/en/memcached.setbykey.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 Returns TRUE on success or FALSE on failure.
*/
public function setByKey( $server_key, $key, $value, $group = 'default', $expiration = 0 ) {
return $this->set( $key, $value, $group, $expiration, $server_key, true );
}
/**
* Set 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.
*
* @link http://www.php.net/manual/en/memcached.setmulti.php
*
* @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.
* @param string $server_key The key identifying the server to store the value on.
* @param bool $byKey True to store in internal cache by key; false to not store by key
* @return bool Returns TRUE on success or FALSE on failure.
*/
public function setMulti( $items, $groups = 'default', $expiration = 0, $server_key = '', $byKey = false ) {
// Build final keys and replace $items keys with the new keys
$derived_keys = $this->buildKeys( array_keys( $items ), $groups );
$expiration = $this->sanitize_expiration( $expiration );
$derived_items = array_combine( $derived_keys, $items );
// Do not add to memcached if in no_mc_groups
foreach ( $derived_items as $derived_key => $value ) {
// Get the individual item's group
$key_pieces = explode( ':', $derived_key );
// If group is a non-Memcached group, save to runtime cache, not Memcached
if ( in_array( $key_pieces[1], $this->no_mc_groups ) ) {
$this->add_to_internal_cache( $derived_key, $value );
unset( $derived_items[$derived_key] );
}
}
// Save to memcached
if ( $byKey )
$result = $this->m->setMultiByKey( $server_key, $derived_items, $expiration );
else
$result = $this->m->setMulti( $derived_items, $expiration );
// Store in runtime cache if add was successful
if ( Memcached::RES_SUCCESS === $this->getResultCode() )
$this->cache = array_merge( $this->cache, $derived_items );
return $result;
}
/**
* Set 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.
*
* @link http://www.php.net/manual/en/memcached.setmultibykey.php
*
* @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 Returns TRUE on success or FALSE on failure.
*/
public function setMultiByKey( $server_key, $items, $groups = 'default', $expiration = 0 ) {
return $this->setMulti( $items, $groups, $expiration, $server_key, true );
}
/**
* Set a Memcached option.
*
* @link http://www.php.net/manual/en/memcached.setoption.php
*
* @param int $option Option name.
* @param mixed $value Option value.
* @return bool Returns TRUE on success or FALSE on failure.
*/
public function setOption( $option, $value ) {
return $this->m->setOption( $option, $value );
}
/**
* Builds a key for the cached object using the blog_id, key, and group values.
*
* @author Ryan Boren This function is inspired by the original WP Memcached Object cache.
* @link http://wordpress.org/extend/plugins/memcached/
*
* @param string $key The key under which to store the value.
* @param string $group The group value appended to the $key.
* @return string
*/
public function buildKey( $key, $group = 'default' ) {
if ( empty( $group ) )
$group = 'default';
if ( false !== array_search( $group, $this->global_groups ) )
$prefix = $this->global_prefix;
else
$prefix = $this->blog_prefix;
return preg_replace( '/\s+/', '', WP_CACHE_KEY_SALT . "$prefix$group:$key" );
}
/**
* Creates an array of keys from passed key(s) and group(s).
*
* This function takes a string or array of key(s) and group(s) and combines them into a single dimensional
* array that merges the keys and groups. If the same number of keys and groups exist, the final keys will
* append $groups[n] to $keys[n]. If there are more keys than groups and the $groups parameter is an array,
* $keys[n] will be combined with $groups[n] until $groups runs out of values. 'default' will be used for remaining
* values. If $keys is an array and $groups is a string, all final values will append $groups to $keys[n].
* If both values are strings, they will be combined into a single string. Note that if more $groups are received
* than $keys, the method will return an empty array. This method is primarily a helper method for methods
* that call memcached with an array of keys.
*
* @param string|array $keys Key(s) to merge with group(s).
* @param string|array $groups Group(s) to merge with key(s).
* @return array Array that combines keys and groups into a single set of memcached keys.
*/
public function buildKeys( $keys, $groups = 'default' ) {
$derived_keys = array();
// If strings sent, convert to arrays for proper handling
if ( ! is_array( $groups ) )
$groups = (array) $groups;
if ( ! is_array( $keys ) )
$keys = (array) $keys;
// If we have equal numbers of keys and groups, merge $keys[n] and $group[n]
if ( count( $keys ) == count( $groups ) ) {
for ( $i = 0; $i < count( $keys ); $i++ ) {
$derived_keys[] = $this->buildKey( $keys[$i], $groups[$i] );
}
// If more keys are received than groups, merge $keys[n] and $group[n] until no more group are left; remaining groups are 'default'
} elseif ( count( $keys ) > count( $groups ) ) {
for ( $i = 0; $i < count( $keys ); $i++ ) {
if ( isset( $groups[$i] ) )
$derived_keys[] = $this->buildKey( $keys[$i], $groups[$i] );
elseif ( count( $groups ) == 1 )
$derived_keys[] = $this->buildKey( $keys[$i], $groups[0] );
else
$derived_keys[] = $this->buildKey( $keys[$i], 'default' );
}
}
return $derived_keys;
}
/**
* Ensure that a proper expiration time is set.
*
* Memcached treats any value over 30 days as a timestamp. If a developer sets the expiration for greater than 30
* days or less than the current timestamp, the timestamp is in the past and the value isn't cached. This function
* detects values in that range and corrects them.
*
* @param string|int $expiration The dirty expiration time.
* @return string|int The sanitized expiration time.
*/
public function sanitize_expiration( $expiration ) {
if ( $expiration > $this->thirty_days && $expiration <= $this->now ) {
$expiration = $expiration + $this->now;
}
return $expiration;
}
/**
* Concatenates two values and casts to type of the first value.
*
* This is used in append and prepend operations to match how these functions are handled
* by memcached. In both cases, whichever value is the original value in the combined value
* will dictate the type of the combined value.
*
* @param mixed $original Original value that dictates the combined type.
* @param mixed $pended Value to combine with original value.
* @param string $direction Either 'pre' or 'app'.
* @return mixed Combined value casted to the type of the first value.
*/
public function combine_values( $original, $pended, $direction ) {
$type = gettype( $original );
// Combine the values based on direction of the "pend"
if ( 'pre' == $direction )
$combined = $pended . $original;
else
$combined = $original . $pended;
// Cast type of combined value
settype( $combined, $type );
return $combined;
}
/**
* Simple wrapper for saving object to the internal cache.
*
* @param string $derived_key Key to save value under.
* @param mixed $value Object value.
*/
public function add_to_internal_cache( $derived_key, $value ) {
if ( is_object( $value ) ) {
$value = clone $value;
}
$this->cache[$derived_key] = $value;
}
/**
* Determines if a no_mc_group exists in a group of groups.
*
* @param mixed $groups The groups to search.
* @return bool True if a no_mc_group is present; false if a no_mc_group is not present.
*/
public function contains_no_mc_group( $groups ) {
if ( is_scalar( $groups ) )
return in_array( $groups, $this->no_mc_groups );
if ( ! is_array( $groups ) )
return false;
foreach ( $groups as $group ) {
if ( in_array( $group, $this->no_mc_groups ) )
return true;
}
return false;
}
/**
* Add global groups.
*
* @author Ryan Boren This function comes straight from the original WP Memcached Object cache
* @link http://wordpress.org/extend/plugins/memcached/
*
* @param array $groups Array of groups.
* @return void
*/
public function add_global_groups( $groups ) {
if ( ! is_array( $groups ) )
$groups = (array) $groups;
$this->global_groups = array_merge( $this->global_groups, $groups);
$this->global_groups = array_unique( $this->global_groups );
}
/**
* Add non-persistent groups.
*
* @author Ryan Boren This function comes straight from the original WP Memcached Object cache
* @link http://wordpress.org/extend/plugins/memcached/
*
* @param array $groups Array of groups.
* @return void
*/
public function add_non_persistent_groups( $groups ) {
if ( ! is_array( $groups ) )
$groups = (array) $groups;
$this->no_mc_groups = array_merge( $this->no_mc_groups, $groups );
$this->no_mc_groups = array_unique( $this->no_mc_groups );
}
/**
* Get a value specifically from the internal, run-time cache, not memcached.
*
* @param int|string $key Key value.
* @param int|string $group Group that the value belongs to.
* @return bool|mixed Value on success; false on failure.
*/
public function get_from_runtime_cache( $key, $group ) {
$derived_key = $this->buildKey( $key, $group );
if ( isset( $this->cache[$derived_key] ) )
return $this->cache[$derived_key];
return false;
}
/**
* Switch blog prefix, which changes the cache that is accessed.
*
* @param int $blog_id Blog to switch to.
* @return void
*/
public function switch_to_blog( $blog_id ) {
global $table_prefix;
$blog_id = (int) $blog_id;
$this->blog_prefix = ( is_multisite() ? $blog_id : $table_prefix ) . ':';
}
}