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PHP Manual [Memcached

Memcached::getAllKeys || Memcached::getDelayed || Memcached || PHP Manual

(PECL memcached >= 0.1.0)

Memcached::getByKeyRetrieve an item from a specific server


public mixed Memcached::getByKey ( string $server_key , string $key [, callable $cache_cb [, float &$cas_token ]] )

Memcached::getByKey() is functionally equivalent to Memcached::get(), except that the free-form server_key can be used to map the key to a specific server.



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.


The key of the item to fetch.


Read-through caching callback or NULL


The variable to store the CAS token in.

Return Values

Returns the value stored in the cache or FALSE otherwise. The Memcached::getResultCode() will return Memcached::RES_NOTFOUND if the key does not exist.

See Also

Memcached::getAllKeys || Memcached::getDelayed || Memcached || PHP Manual
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