Add-cart.php Num -

: It is frequently used as the action attribute in an HTML form or as a direct link (e.g., Add to Cart ).

if (!$productId || !$quantity || $quantity < 1 || $quantity > 99) die('Invalid product or quantity'); add-cart.php num

$product_id = filter_input(INPUT_POST, 'product_id', FILTER_VALIDATE_INT, ['options' => ['min_range' => 1]]); $quantity = filter_input(INPUT_POST, 'quantity', FILTER_VALIDATE_INT, ['options' => ['min_range' => 1, 'max_range' => 99]]); : It is frequently used as the action

: Checks if the product ID exists and if the num (quantity) is a valid positive integer. 1 || $quantity &gt

if ($quantity > 100) // Set a reasonable max per transaction die("Quantity exceeds maximum allowed.");