So Walter told me about [url=http://pecl.php.net/package/inclued]inclued[/url]. Since I like to play, I used it to generate nice class and include graphs for b2evo 2.4.6 (I loaded the "Blog A" index page):
[url=http://image.gd/image,show,1,48bdae96b3267e17899ccf2c3b1328f15af476c6,3]Classes[/url]
[url=http://image.gd/image,show,1,379eb3524e38d5d4f9179e22baf71c793e861148,3]Includes[/url] (huge!)

See also: http://blog.fedecarg.com/2008/08/04/php-applications-where-is-the-include-coming-from/
Have fun. ;)