The pattern product.php?id=1 is extremely common, but it also opens doors for attackers if not handled properly. Here’s what you must always do:
We’ll use MySQL to store product data. Create a table called products with at least these columns: php id 1 shopping top
if ($product_id && $product_price && $quantity && $quantity > 0) // Check if product already in cart if (isset($_SESSION['cart'][$product_id])) $_SESSION['cart'][$product_id]['quantity'] += $quantity; else $_SESSION['cart'][$product_id] = [ 'name' => $product_name, 'price' => $product_price, 'quantity' => $quantity ]; The pattern product
If the developer did not properly clean or sanitize that input, the database query becomes: SELECT * FROM products WHERE product_id = 1 OR 1=1; Use code with caution. The pattern product.php?id=1 is extremely common