Until now, I was always using PHP's `$_SESSION` for login and shopping cart storage on my online store. Can I safely change the shopping cart storage to PHP's `setcookie`, since I want my customers to keep their shopping carts for a long time? I'm worried about the customers who doesn't have cookies enabled. Are there any Internet users, who doesn't have cookies enabled? Or should I use `$_SESSION` as a backup method - for an example, to save them both with session and cookies?