方法1:将php.ini中的session.gc_maxlifetime设置为9999重启apache

  方法2:$savePath = "./session_save_dir/";

         $lifeTime = 小时 * 秒;

         session_save_path($savePath);

         session_set_cookie_params($lifeTime);

         session_start();

    方法3:setcookie() and session_set_cookie_params($lifeTime);