Routing and PHP scripts, not loading the index.php

I’m in the process of changing a PHP site to ROR. I think this is a
routing problem.

Going to:

doesn’t load up the index.php … I have index.php in the DirectoryIndex
directive in Apache2.

Works however, if you go to any other urls that have no file name
specified (since index.php is default)

Also same problem.

I’ve looked and googled for the past few hours, I can’t seem to figure
out how to go about this. Has anybody done something like this? or
should I just change all my php pages to specify index.php ??