I haven’t looked at the source code, but I am assuming that is where the meat of the article lies because it certainly does not lie in the article itself. I read the title and got excited thinking that it would be an excellent writeup going into making reusable classes, etc., only to find that there really was nothing. Again, maybe its all in the source code.

One day or another, every developer faces a situation in which he/she is responsible for extending the functionality of an existing application or prepare an application for an increase in use and traffic (scaling up). Our goal today is to make this process trivial by learning to develop applications based on a clean, elegant and modular design that is secure, reliable and flexible while keeping it all simple.