Memcached::add

(PECL memcached >= 0.1.0)

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

Descrizione

public 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.

Elenco dei parametri

key: La chiave in cui salvare il valore.
value: Il valore da salvare.
expiration: La data di scadenza, il default è 0. Vedere Date di scadenza per ulteriori informazioni.

Valori restituiti

Restituisce true in caso di successo, false in caso di fallimento. The Memcached::getResultCode() will return Memcached::RES_NOTSTORED if the key already exists.

Vedere anche:

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

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User Contributed Notes 1 note

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ilya dot chase at yandex dot ru ¶

5 years ago

Note that this operation is atomic, means that it's safe from race condition operation (since memcached is running in single process). You can use this method for locks and can be sure that two requests will not get "true" simultaneously using this method.

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