Sure you can run PHP in the CSS file.
Just add the correct header at the top of the page
And my css file works great, I'm just having trouble building all of the dynamics into the css page itself because of the way the files are embedded in the html.
I was thinking of the query string parameter but that's too simple. There has to be a way to detect the page that is calling the css page. I'm just wondering if anyone might have another idea of how to go about it.