Add-cart.php Num ((hot)) Here
$quantity = filter_input(INPUT_GET, 'num', FILTER_VALIDATE_INT); if ($quantity === false || $quantity === null || $quantity < 1) $quantity = 1; // Default to safe minimum
For instance, if a customer wishes to add 5 units of a product (Product ID: 12345) to their cart, the "add-cart.php" script would do the following:
If it doesn't, it creates a new entry for that product ID with the value of num . add-cart.php num
For high-value carts, generate a unique cart_operation_id on the client and send it with each add-cart request. The server stores processed IDs to prevent duplicate additions.
session_start(); if ($_SERVER['REQUEST_METHOD'] !== 'POST') http_response_code(405); die('POST required'); session_start(); if ($_SERVER['REQUEST_METHOD']
// Function to get product details function getProductDetails($product_id) $products = [ 1 => ['name' => 'Product 1', 'price' => 29.99, 'stock' => 50], 2 => ['name' => 'Product 2', 'price' => 49.99, 'stock' => 30], 3 => ['name' => 'Product 3', 'price' => 19.99, 'stock' => 100], ]; return isset($products[$product_id]) ? $products[$product_id] : null;
: Passing an extremely large number could cause integer overflow errors in the database or artificially deplete inventory logs. 3. SQL Injection (SQLi) 1 || $quantity >
$_SESSION['cart'][$product_id] = $new_quantity;
if (!$productId || !$quantity || $quantity < 1 || $quantity > 99) die('Invalid product or quantity');
: Users can often specify a higher num via a quantity selector on the product page before clicking "Add to Cart".