Memcached::add

(PECL memcached >= 0.1.0)

Memcached::addAdd an item under a new key

Descrizione

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

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User Contributed Notes 2 notes

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ilya dot chase at yandex dot ru
5 months 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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zhoujunwen888 at 126 dot com
4 years ago
<?php
/**
* Created by PhpStorm.
* User: zhoujunwen
* Date: 15/6/17
* Time: 下午4:51
*/
   
$mem  = new Memcached();

   
$mem->addServer('127.0.0.1',11211);
    if(
$mem->add("mystr","this is a memcache test!",3600)){
        echo 
'原始数据缓存成功!';
    }else{
        echo
'数据已存在:'.$mem->get("mystr");
    }

?>
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