Add-cart.php Num [extra Quality]

By switching to POST requests, CSRF tokens, server-side price validation, and meaningful parameter names, you eliminate entire classes of bugs. The next time you see add-cart.php?num= in a codebase—whether yours or a third-party plugin—treat it as a red flag and refactor it immediately.

: Emphasize sanitizing the num input using (int) casting to prevent SQL injection or cross-site scripting (XSS) if the value is later echoed. Learning proper PHP Syntax is the first step toward secure coding. add-cart.php num

Sending num=0 is often used by attackers to test the robustness of the cart system. Does it clear the item? Does it do nothing? Or does it add an entry to the database that creates a "ghost" cart, cluttering the system? By switching to POST requests, CSRF tokens, server-side