I'm new to PHP and in order to learn the language and the concepts I'm working on a e-commerce website with a shopping cart, etc. In this site I have items, when an item is clicked, the id of the item is sent via the GET method to the shopping cart page. Using this id, I add the item to the shopping cart(table in db) and it works fine.
<a href="do_shoppingcart.php?id=<?php echo "$itm_id"; ?>">
The issue is; if the user clicks the refresh button, the item is added again to the shopping cart. Do you think that disabling the refresh button or F5 button is a good option? what must i do to prevent the user from adding the item to the shopping cart when the page is refreshed? In forms I've noticed that "(isset($_POST['Submit'])){}" is helpful, but for the GET method this doesn't work accordingly.
Senin yardım takdir edilmektedir.