centos + nginx + php.. how to?

I currently have nginx installed and running on a CentOS server.

It's all good.

Now I'm trying to enable PHP but can't seem to find any clear tutorial (even nginx's docs) that will explain it straightly.

I understood so far that it's composed of two components: PHP-CGI & FCGI.

What commands simply install it? Preferbly using "yum".

Also, I want that nginx will pass data to PHP through a unix socket file, and not through TCP - performance wise.

This nginx's doc page jumps, and is not suitable for someone who just starting to get to know these stuff, as myself.

I thank you in advance!