The extended functionality classes offer GUI-less background features that are commonly needed in HTML-applications. They may make use of core functionality (indicated for each class below).

Class Cart in cart.inc: Manages a simple shopping cart. Items can be put into the cart, taken out of the cart and the carts contents can be enumerated.

Depends on Sessionto be useful. Requires that you add the statement require("cart.inc") to prepend.php3.

Class Template in template.inc: Manages templates and variable replacement. Templates can be stored in files. They are loaded on demand and variables are replaced in these files. This allows you to separate your design from the application code.

An independent class. Requires that you add the statement require("template.inc") to prepend.php3 or that you include it manually on each page where you want to use it.