(PECL memcached >= 0.1.0)
Memcached::casByKey — Compare and swap an item on a specific server
$cas_token
, string $server_key
, string $key
, mixed $value
[, int $expiration
] ) : bool
Memcached::casByKey() is functionally equivalent to
Memcached::cas(), except that the free-form
server_key
can be used to map the
key
to a specific server. This is useful if you need
to keep a bunch of related keys on a certain server.
cas_token
Unique value associated with the existing item. Generated by memcache.
server_key
The key identifying the server to store the value on or retrieve it from. Instead of hashing on the actual key for the item, we hash on the server key when deciding which memcached server to talk to. This allows related items to be grouped together on a single server for efficiency with multi operations.
key
Değerin saklanacağı anahtar.
value
Saklanacak değer.
expiration
Zaman aşımı, öntanımlı 0'dır. Daha ayrıntılı bilgi için Zaman aşımı süreleri bölümüne bakınız.
Başarı durumunda TRUE
, başarısızlık durumunda FALSE
döner.
The Memcached::getResultCode() will return
Memcached::RES_DATA_EXISTS
if the item you are trying
to store has been modified since you last fetched it.