New versions of CI come up from time to time. They come with comprehensive instructions for updating. Usually, this involves copying a new set of files to your CI_system
folder. Sometimes, you need to change config
files, or your index.php
file as well. Because the folder structure keeps your application files in their place, it's usually easy to update the system without touching the applications.
But, say you've written your killer application in version 1.7.1. It's uploaded to your production system and is working fine. Then CI version 1.7.2 comes out (or 2.8 or whatever…). It has interesting new features and some bug fixes. Do you upgrade to it?
We would say, "Yes", if it's a minor upgrade. But if it's a major version change, and your existing system is working fine, it may take some more time to update it, so you will need to decide if the changes are going to help you or not. You can tell the difference partly from the numbering...