CodeIgniter is a powerful PHP framework with a small footprint, built for those who required a simple, yet elegant toolkit to build fully-featured web applications.
It requires nearly zero configuration, with no restrictive coding rules, and offers simple solutions to complex application requirements.
CodeIgniter features a rich set of libraries for commonly needed tasks, as well as a simple interface and logical structure to access these libraries.
It’s exceptionally fast, as its core system only requires a few small libraries, with additional libraries loaded dynamically upon requests, based on your needs for a given process. This means the base system is both lean and agile.
As CodeIgniter uses the MVC controller approach, it allows for great separation between logic and presentation, particularly useful for projects in which designers are working on template files.