Addcartphp Num High Quality Official

$_POST['num'] = 'abc'; include 'add_to_cart.php'; $this->expectOutputRegex('/Invalid quantity/');

echo json_encode([ 'success' => true, 'cart_count' => array_sum(array_column($_SESSION['cart'], 'quantity')), 'message' => "Added $num item(s) to cart." ]); 3.1. CSRF Protection on Add-to-Cart A hidden risk: malicious sites tricking users into adding items. High-quality scripts include a CSRF token.

// Optionally enforce precision $num = round($num, 2); // e.g., 1.25 kg Protect your server from rapid addcartphp spam: addcartphp num high quality

// If product already in cart, update quantity (add to existing) if (isset($_SESSION['cart'][$product_id])) $new_quantity = $_SESSION['cart'][$product_id]['quantity'] + $num;

This uses FILTER_VALIDATE_INT (not intval() ), which distinguishes between 0 , null , and false . It rejects decimals, strings, and empty values explicitly. 2.2. Checking Inventory Before Adding A premium addcartphp script never assumes stock. It queries the database live. $_POST['num'] = 'abc'; include 'add_to_cart

// Check if requested quantity exceeds available stock if ($num > $product['stock_quantity']) die(json_encode([ 'error' => 'Insufficient stock', 'available' => $product['stock_quantity'] ]));

$_POST['num'] = '5'; $_POST['product_id'] = '101'; $this->expectOutputRegex('/"success":true/'); include 'add_to_cart.php'; // Optionally enforce precision $num = round($num, 2); // e

A high-quality backend needs an equally robust frontend. Use JavaScript to enforce numeric integrity before the request reaches addcartphp .