RSS to PHP

Hi, im trying to work on an RSS feed that pulls data from a mySQL database.

these display fine, but as soon as I change the file extension to php it ends up looking like this:

Does anyone know a solution?

All 3 working fine here in Firefox 3 Mac OS10.5.

You may need to set the mime time to xml and for some programs ReWrite your URL to allow rss.xml run as rss.php

header("Content-Type: text/xml");

.htaccess

Options +FollowSymLinks
RewriteEngine on
RewriteRule rss.xml$ rss.php
RewriteRule rss/$ rss.php