Maggie Nelson has linked to a blog post detailing one of the simplest ways to get a powerful database system, Oracle, up and working with PHP:

This is something that I wanted to post up for a while, because this is rather simple stuff and yet it took me a while to put this whole thing together for my own use/setup. It's also something that got some people interested and they asked me to post this up. So this post is for Maggie Nelson who is an active PHP and Oracle advocate.

It's basically an eleven step process to get things up and working (on linux) and involves installing RPMs, editing config files, and configuring the PHP installation to pull in the Oracle module.