Today we are going to show you how to install CodeIgniter on Linux.. CodeIgniter is a very powerful PHP web application framework which allows developers to create full-featured web applications with ease. It is a framework with a small footprint, has a clear documentation and uses the Model-View-Controller approach to separate the presentation from logic. Installing CodeIgnitier on your Linux server is an easy task, and it shouldn’t take more then 10 minutes to finish the installation.