(PECL memcache >= 0.2.0) Open memcached server connection
(PECL memcache >= 2.0.0) Get statistics from all servers in pool
(PECL memcache >= 0.2.0) Get statistics of the server
(PECL memcache >= 0.4.0) Open memcached server persistent connection
(PECL memcache >= 0.2.0) Replace value of the existing item
(PECL memcache >= 0.2.0) Delete item from the server
(PECL memcache >= 0.2.0) Decrement item's value
(PECL memcache >= 1.0.0) Flush all existing items at the server
(PECL memcache >= 2.1.0) Returns server status
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