Add-cart.php Num

: Mask explicit PHP scripts by using an .htaccess file or Nginx rewrite rules to convert add-cart.php?num=123 into a cleaner RESTful route like /cart/add/123 .

: Always start with session_start() to access the user's cart data.

if ($_SERVER['REQUEST_METHOD'] !== 'POST') http_response_code(405); die("Method not allowed"); add-cart.php num

if (isset($_SESSION['cart'][$product_id])) $_SESSION['cart'][$product_id] += $quantity; else $_SESSION['cart'][$product_id] = $quantity;

Is num intended to represent the or the Quantity ? : Mask explicit PHP scripts by using an

$maxQty = min($product['stock'], 99); // example cap if ($num > $maxQty) $num = $maxQty;

Using the GET method ( add-cart.php?num=123 ) allows state-changing actions to be executed via a simple URL. This opens the door to Cross-Site Request Forgery (CSRF) and web crawler complications, where search engine bots clicking links accidentally fill up server sessions. $maxQty = min($product['stock'], 99); // example cap if

, used by researchers or attackers to find vulnerable e-commerce sites. Sites using simple parameters like without proper SQL injection protection can be susceptible to data breaches or unauthorized access. Course Hero code example of how to securely handle this parameter in PHP?