$md5_key="FPI001"; $order_number=$_POST['order_number']; $partner=$_POST['partner']; $pay_id=$_POST['pay_id']; $total_fee=$_POST['total_fee']; $return_url=$_POST['return_url']; $notify_url=$_POST['notify_url']; $sign="order_number=".$order_number."&partner=".$partner."&pay_id=".$pay_id."&total_fee=".$total_fee; $sign=$sign.$md5_key; $sign_f= md5($sign); ?>