Installing PHP

I downloaded and installed PHP 5.2.2. Unfortunately, nothing happened. Somehow, the installer hadn't updated Apache's httpd conf file (which is inside the conf directory) to load php correctly. I think for most people the installer sets this file up for you automatically. Anyways, the useful directions I followed are here, where basically you insert 3 lines into the httpd file. Now I have "hello world" going on! Yay!