This is another repost from my other blog which doesn't exist any longer. I am retaining it for reference.

Federico of PhpImpact posted a few graphs showing class dependencies and files inclusion of various open source frameworks such as WordPress, MediaWiki, CodeIgniter and CakePHP. These graphs provides an overview of files and classes inclusion during the initial load of a system. These graphs also show which files and classes are being referenced or called from the root controller, showing dependency structure of the said system.

There isn't any graph for Joomla! 1.5 yet which I use fairly often so I created one using Inclued and Graphviz utility. The following 2 graphs are generated from Joomla! 1.5.7 running default frontpage controller.