Here's a site where they have precompiled packages for install on the MacOSX public beta (MySQL, too). I've used it and it works fairly well.
http://homepage.mac.com/LightyearDesign/MacOSX/
As far as getting php on macos 8.x or 9, I'd love to know how to do that as well but have heard nothing.
Also, a very good information source for how-to, etc. are the Macnn.com osx developer forums.
Good luck,
-Ben
http://ideacog.net