memcached mysql操作

<?php
header("content-type:text/html;charset=GBK");
//页面数据缓存

//1.当前页面有没有缓存（memcache---data）
$mem = new Memcache;

$mem->connect("127.0.0.1",11211);

//$mem->set("data","lalala",0,5);

$re= $mem->get("data");


if(!$re){
    //没缓存
    //生成缓存 数据去数据\n

    $link = new PDO("mysql:host=127.0.0.1;dbname=test","root","root");

    $ob= $link->query("select * from jl_good");

    $arr = $ob->fetchAll();

    $mem->set("data",$arr,0,5);

    print_r($mem->get("data"));
    echo "1111111111111111111";
}else{
    print_r($mem->get("data"));
}

$A=111;
  
  
?>