PHP Conference China 2020

Memcached::add

(PECL memcached >= 0.1.0)

Memcached::addAdd an item under a new key

Descrição

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.

Parâmetros

key

A chave sobre a qual guardar o valor.

value

O valor para guardar.

expiration

O tempo de expiração, padrão é 0. Veja Tempos de Expiração para maiores informações.

Valor Retornado

Retorna TRUE em caso de sucesso ou FALSE em caso de falha. The Memcached::getResultCode() will return Memcached::RES_NOTSTORED if the key already exists.

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User Contributed Notes 2 notes

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1
ilya dot chase at yandex dot ru
1 year 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
5 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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