PHP OOP exercices.

The purspose of this files is to do basic and advanced PHP OOP Exercises
I'll try to pass through most important features
Inspiration:
http://www.phpbuilder.com/articles/application-architecture/object-oriented/advanced-object-oriented-programming-in-php.html
http://stackoverflow.com/questions/1912902/what-exactly-are-late-static-bindings-in-php
http://www.phptherightway.com/pages/Design-Patterns.html
http://code.tutsplus.com/series/design-patterns-in-php--cms-747