PHP Session expiring and system force logout -

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when left system in idle mode( means inactive mode) , , when come access system after 1 or 2 hours, system reacts when use single window when generate recieppt through ajax , open receipt in window.popup window system logs out. , redirect login page because session expired in idle mode , if set session lifetime,

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

plese ......

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


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