(PECL memcached >= 0.1.0)
Memcached::add — 向新 key 添加元素
Memcached::add() 与 Memcached::set() 类似，但如果
key 已经在服务端存在，则操作失败。
成功时返回 true， 或者在失败时返回 false。
如果 key 已经存在，Memcached::getResultCode() 将会返回 Memcached::RES_NOTSTORED。
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.<?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");
}
?>