$per3 = strftime('%b',mktime(0,0,0,date('m')-3,date('d'),date('Y')));
$per4 = strftime('%b',mktime(0,0,0,date('m')-4,date('d'),date('Y')));
$per3 = strftime('%b',mktime(0,0,0,date('m')-3,date('d'),date('Y')));
$per4 = strftime('%b',mktime(0,0,0,date('m')-4,date('d'),date('Y')));