Memcached::add

(PECL memcached >= 0.1.0)

Memcached::addAdd an item under a new key

설명

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

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

인수

key

값을 저장할 키.

value

저장할 값.

expiration

만료 시간, 기본값은 0. 자세한 정보는 만료 시간을 참고하십시오.

반환값

성공 시 TRUE를, 실패 시 FALSE를 반환합니다. The Memcached::getResultCode() will return Memcached::RES_NOTSTORED if the key already exists.

참고

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User Contributed Notes 2 notes

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ilya dot chase at yandex dot ru
6 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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-30
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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