title: want to upgrade PHP 5.3 to 5.4?
body: <p>I just started working with php so I don't have any idea what is involved with upgrades. Currently, I'm working with php 5.3, and would like to move to 5.4.  How is this done?  Is it just a simple installation of 5.4 ? Will this break code written in 5.3?</p>