use Symfony\Component\HttpFoundation\Session\Session;
//存储session

$session = new Session;
$session->set("u_name",$ar->u_name);
$session->set("u_pwd",$ar->u_pwd);
//每次取session必加上

use Symfony\Component\HttpFoundation\Session\Session;

//取session

$session = new Session;
$ss=$session->get("u_name");