Do not upgrade PHP to version 5.3.0!

If you are planing PHP upgrade on your server have in mind that the 5.3.0 version has a bug which was fixed in 5.3.1. If your websites requires register_globals set to On you will have troubles. If there is no php 5.3.1 package available in your distribution repositority try to find it elsewhere or wait a while until it’s compiled for your distro.