By hardening your add-cart.php logic, you do more than protect a script—you protect your revenue, your reputation, and your customers. The next time you see ?num=1 in a URL, remember: it only takes one malformed request to break the cart. Don't let that cart be yours.
The script should follow these functional steps to ensure reliability: add-cart.php num
In web development, particularly in PHP-based e-commerce systems, add-cart.php (or similar filenames like cart_update.php or handlecard.php ) serves as the responsible for adding items to a user's virtual shopping cart. Core Functionality By hardening your add-cart