CodeIgniter is a PHP MVC framework used to rapidly develop web applications. CodeIgniter provides out-of-the-box libraries to connect to the database and perform various operations like sending emails, downloading files, managing sessions, etc.
CodeIgniter is an open source software rapid development web framework for use in building dynamic websites with PHP.
System based on a model view controller. Extremely light-weight. Complete database classes with support for multiple platforms. Support for the Query Builder database. Validation of forms and data. XSS security and filtering. Session management. The course of sending e-mails.