if(isset($_GET["se"])){
$se = $_GET["se"];
}else{
return;
}

if(!empty($se)){

echo("receive se: ".$se."

"); //接受的的session为$se
session_id($se); //设置$se位session_id
session_start(); //开启sesseion ，注意不能与上一步对调，打工告成
echo("new session id: ".session_id()."

");
echo $_SESSION['h'];
}