Add-cart.php Num _top_

This is the most crucial logic block. If a user clicks "Add to Cart" twice for the same product, you generally don't want two separate rows in your database. You want to increase the of the existing row.

If you are developing or maintaining this script, ensure the following modern PHP standards are met: raft-medium-files.txt - GitHub

| Test Case | Expected Behavior | Your Result | |-----------|------------------|--------------| | num=abc | 400 Bad Request / No change to cart | | | num=-5 | Ignored or default to 1 | | | num=1.5 | Reject as invalid integer | | | num=9999999 | Reject (max allowed quantity) | | | num=1%20OR%201=1 | No SQL error, no data leak | | | No num parameter | 400 Bad Request | | | Repeated requests to same num | Throttled after X requests/second | | | CSRF token missing | Cart not modified | | add-cart.php num

The hum of the lights shifted. The room didn't go dark; it just started to... unprint.

If the script uses num to query a database without prepared statements, it’s game over. This is the most crucial logic block

fetch('add-cart.php', method: 'POST', headers: 'Content-Type': 'application/x-www-form-urlencoded', body: `product_id=123&num=$quantity` )

: Always start with session_start() to access the user's cart data. If you are developing or maintaining this script,

// In the form <input type="hidden" name="csrf_token" value="<?php echo $_SESSION['csrf_token']; ?>">