Memcached::replace

(PECL memcached >= 0.1.0)

Memcached::replace — Replace the item under an existing key

public bool Memcached::replace ( string $key , mixed $value [, int $expiration ] )

Memcached::replace() is similar to Memcached::set(), but the operation fails if the key does not exist on the server.

如果成功則回傳 TRUE，失敗則回傳 FALSE。 The Memcached::getResultCode() will return Memcached::RES_NOTSTORED if the key does not exist.

Memcached::replaceByKey() - Replace the item under an existing key on a specific server
Memcached::set() - Store an item
Memcached::add() - Add an item under a new key

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