Memcached::add

(PECL memcached >= 0.1.0)

Memcached::add — Add an item under a new key

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

Memcached::add() is similar to Memcached::set(), but the operation fails if the key already exists on the server.

key: The key under which to store the value.
value: The value to store.
expiration: The expiration time, defaults to 0. See Expiration Times for more info.

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