PHP Session expiring and system force logout

Question

When i left system is in idle mode( means inactive mode) , and when i come to access system after 1 or 2 hours, system reacts well when i use single window but when i generate recieppt through ajax and open the receipt in window.popup window then the system logs out. and redirect to login page because session expired in idle mode , even if i set the session for lifetime,

case '1':
        $_SESSION['kid'] = $q4['id'];
        ini_set('session.gc_maxlifetime', 100*60*60);
        session_set_cookie_params(0,"/");
break;

plese help ......

Answer 1

ini_set('session.gc_maxlifetime', ...) should be called before session_start()