Add-cart.php Num

Or, via GET method (less secure, but common): /add-cart.php?product=456&num=3

They send a phishing email: Click here to add to cart: https://store.com/add-cart.php?id=777&num=1&PHPSESSID=attacker_controlled add-cart.php num

An attacker sends: add-cart.php?num=1\r\n[ERROR] System compromised\r\n&id=105 Or, via GET method (less secure, but common): /add-cart

Use addslashes() or log in structured formats (JSON) with strict key validation. Building a Secure add-cart.php from Scratch Here is a production-ready example handling the num parameter securely: via GET method (less secure

if (!$product_id || !$quantity) http_response_code(400); die(json_encode(['error' => 'Invalid product or quantity']));

// 5. Log safely error_log(sprintf("Cart update: User %s, Product %d, Qty %d", session_id(), $product_id, $quantity));