CodeIgniter is an open source web application framework for use in building dynamic web sites with PHP

CodeIgniter is a powerful PHP framework with a very small footprint, built for PHP coders who need a simple and elegant toolkit to create full-featured web applications. If you're a developer who lives in the real world of shared hosting accounts and clients with deadlines, and if you're tired of ponderously large and thoroughly undocumented frameworks

CodeIgniter Features

• User Guide
  One of the most important features of the CodeIgniter is that it has a very impressive user guide. The way the documentation has been done is simply marvelous and highly useful for coders to know more about the working.
• Simplicity
  CodeIgniter is simple and a major portion of the work gets completed in the controllers and uploading the libraries. Since the workings are clear and open, it is very easy to understand what is happening and therefore, simple to use.
• Model Handling
  While working with models, CodeIgniter uses a straight way of handling. Standard SQL queries can be mimed using few simple commands. Also creation of model objects, loading it and introducing methods to deal with a customized task is also possible.
• Data Validation
  Data validation is a major thing while working on models. Here a validation class is used to validate data. First, few rules are defined and assigned to the object to be validated. The data that is sent through the URL is automatically validated by the validation object. Even certain error messages can also be automated the same way, using data validation class.

Advantage of using CodeIgniter

• Migration from one server to another is easier and hassle-free. Also installation is easier as well.
• CI is very easy to handle and also to customize. In case a new functionality has to be applied, it can be done without affecting the customization.
• With MVC based framework, it offers flexibility and easy management.
• Active Record Implementation is simply superb and easy to remember.
• Configuration and customization of these configuration files are also easy, thus facilitating easy working with various types of developers.
• The collection of libraries that it posses is also good enough.
• Awesome documentation of the user guide, which makes any coder easy to use the whole framework.

For more information please visit codeigniter.com