want to upgrade PHP 5.3 to 5.4? [closed]

Question

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?

Answer 1

Migrating from PHP 5.3.x to PHP 5.4.x is the info regarding such upgrade.

Especially have a look into Backward Incompatible Changes section. Some functions were removed in PHP 5.4 and if your PHP 5.3 code is using them, you will get errors. For example, session_register() function does not exist in PHP 5.4