معنى علامة "؟" في أكواد php
// update product quantities foreach ($products as $product) { $stmt = $conn->prepare('UPDATE products SET quantity = quantity - ? WHERE id = ?'); $stmt->bind_param('ii', $product['quantity'], $product['id']); $stmt->execute(); $stmt = $conn->prepare('INSERT INTO order_items (order_id, product_id, quantity, price) VALUES (?, ?, ?, ?)');
بداخل VALUES (?, ?, ?, ?)') و WHERE id = ?' الإستفهام يرمز لماذا؟
