(PECL memcached >= 0.1.0)
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$persistent_id
] )$cas_token
, string $server_key
, string $key
, mixed $value
[, int $expiration
] ) : bool$server_key
, string $key
[, int $offset
= 1
[, int $initial_value
= 0
[, int $expiry
= 0
]]] ) : int$server_key
, string $key
[, callback $cache_cb
[, float &$cas_token
]] ) : mixed$server_key
, array $keys
[, bool $with_cas
[, callback $value_cb
]] ) : bool$server_key
, array $keys
[, string &$cas_tokens
[, int $flags
]] ) : array$server_key
, string $key
[, int $offset
= 1
[, int $initial_value
= 0
[, int $expiry
= 0
]]] ) : int