DB_cart Class is a MySQL shopping cart script that can be used with third party product catalogues and membership systems. The MySQL database structure is neutral to existing systems. It can handle the shopping cart (add, update, and empty) and checkout process (set the shipment address and email the order). For existing cart users, the shopping cart is still available upon the user's next visit and is visible by checkout. The last option is configurable togther with a given time period. The package includes all application file and example data to test all functions. Since version 1.10 its possible to use this class with product data where the stock value is variable.