Aspect PHP

In my research in finding ways to load classes automatically, I have stumbled across Aspect PHP. Does anyone know what it does and why it was developed ? http://frassle.rura.org/Directory/index?cat=11169 It looks like the guy here has done what I am looking for, using __autoload to do classloading . However the final trick I would like to possibly achieve is a servlet style url to automatically load a page class and execute is constructor. I am sure people here have also had a similar idea, if you have any advise in this area ? I am looking at building a PHP5 pet project for a project management application. As sadly the ones I have seen are limited in some ways in terms some dont have good time tracking and invoicing features and obviouslly invoice creation.