PHPCon Poland 2024


(PECL memcached >= 0.1.0)

Memcached::addByKeyAdd an item under a new key on a specific server


public Memcached::addByKey(
    string $server_key,
    string $key,
    mixed $value,
    int $expiration = 0
): bool

Memcached::addByKey() is functionally equivalent to Memcached::add(), 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.



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 under which to store the value.


The value to store.


The expiration time, defaults to 0. See Expiration Times for more info.

Return Values

Returns true on success or false on failure. The Memcached::getResultCode() will return Memcached::RES_NOTSTORED if the key already exists.

See Also

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