I want webalizer to parse *.php files as pages.
Is it enough if I place a text file named webalizer.conf in the /etc directory with this content? Does it replace the default parsing or does it just "complement" the normal setting? Do I need to add anything else. I just want the default options PLUS php parsing as pages.

----------webalizer.conf start----------
PageType htm*
PageType cgi
PageType pl
PageType phtml
PageType php3
PageType php
----------webalizer.conf end-----------

Sure you can do it, it should work and consider the php as pages :) AFAIK you don't need the full configuration file, but there are a lot of useful features and you can make sure webalizer is working just the way you want.