This is a repackaged open source software product wherein additional charges apply for support. CodeIgniter is PHP driven framework but it is not a PHP substitute. Diving into CodeIgniter does not mean you are leaving PHP behind. PHP is a server-side scripting language for building dynamic web-based applications. CodeIgniter contains libraries, simple interface and logical structure to access these libraries, plugins, helpers and some other resources which solve the complex functions of PHP more easily maintaining a high performance. It simplifies the PHP code and brings out a fully interactive, dynamic website at a much shorter time. It supports PHP version of 5.2.6 or newer and MySQL version 4.1 or newer. It makes your web more robust and your code easier to read and maintain. It is a free toolkit, light weight and easier to install.