// Validate product exists and has sufficient stock // ... proceed
// HIGH QUALITY: Maximum quantity limit (business rule) $MAX_QUANTITY = 99; if ($num > $MAX_QUANTITY) http_response_code(400); die(json_encode(['error' => "Maximum quantity per item is $MAX_QUANTITY"]));
// Initialize cart session array if not exists if (!isset($_SESSION['cart'])) $_SESSION['cart'] = []; addcartphp num high quality
echo json_encode([ 'success' => true, 'cart_count' => array_sum(array_column($_SESSION['cart'], 'quantity')), 'message' => "Added $num item(s) to cart." ]); 3.1. CSRF Protection on Add-to-Cart A hidden risk: malicious sites tricking users into adding items. High-quality scripts include a CSRF token.
if ($num < 1) http_response_code(400); die(json_encode(['error' => 'Quantity must be at least 1'])); // Validate product exists and has sufficient stock //
// HIGH QUALITY: Strict numeric validation with reasonable defaults if ($num === false || $num === null) // Not a valid integer http_response_code(400); die(json_encode(['error' => 'Quantity (num) must be a valid integer']));
Introduction: Why "addcartphp num" Demands High Quality In the world of e-commerce, the "Add to Cart" button is the engine of revenue. However, a poorly implemented addcartphp script—especially one handling the quantity ( num ) parameter—can lead to catastrophic failures: inventory overselling, SQL injection attacks, negative stock levels, and frustrated customers. High-quality scripts include a CSRF token
$_SESSION['cart'][$product_id]['quantity'] = $new_quantity; else // Add new product with validated num $_SESSION['cart'][$product_id] = [ 'name' => $product['name'], 'price' => $product['price'], 'quantity' => $num ];