How to solve page reload in php?

Question

I have a shopping cart written in PHP and made some minor changes, working all fine.
Trouble is, when the customer goes from the check-out page to the shopping cart to change method of delivery and moves forward to the check-out page, the changes are visible only after reloading the pages.
I would not mind having a reload button there but how can i integrate a reload button in the php code also without having to deal with the confirmation window popping up?

It is a ready package - i added the following line in the check-out page:
if ($_SESSION['clover_shop_delivery_method'] == Nymix) {$_SESSION['clover_shop_delivery']['subtotal'] = correct (10.50);} else {$_SESSION['clover_shop_delivery']['subtotal'] = correct ( 0.00);}

Answer 1

Well it would seem to me that there is something wrong in the basic method being used to post your page! Is this a shopping cart package or your own code? PHP normally will show updates as long as the code tells it too.