Setting up the CI package on your web server is easy. This small chapter explains what happens when you install the site, and which files will be created. Let's look at:
What software you require for your development site
Installing the CI files: a simple download and unzip operation
The basic configuration of CI: what the folders are and how they are organized
The initial controller and view that CI installs
Some basic modifications to show how these work
CodeIgniter is very flexible. It will work equally well with PHP 4.3.2 and above, or PHP 5. Since the majority of ISPs still don't support PHP 5, this is useful, and keeps down the hosting costs.
You will also need a database. ...