// Expected format: "123:2" $num = $_GET['num'] ?? ''; if (!preg_match('/^(\d+):(\d+)$/', $num, $matches)) die('Invalid format. Use ID:QTY');
<?php session_start();
add-cart.php?num[$gt]=1000
add-cart.php?id=100&num=-999
For persistent carts that remain across different devices or sessions, add-cart.php add-cart.php num
used in e-commerce websites to identify which product is being added to a virtual shopping cart. Course Hero Script Functionality In this context, add-cart.php is the file that processes the "add to cart" action, and // Expected format: "123:2" $num = $_GET['num']