Original author(s)EllisLab
Developer(s)British Columbia Institute of Technology (2014-2019), CodeIgniter Foundation [1] (2019-now)
Initial releaseFebruary 28, 2006 (2006-02-28)
Stable release
4.4.3[2] / 2023-10-26[±]
Written inPHP
Operating systemCross-platform
PlatformPHP 5.6.0+ (v3.1.11)[3] and PHP 7.4 or newer (v4.XX)[4]
TypeWeb framework
LicenseMIT License Edit this at Wikidata

CodeIgniter is an free and open-source software rapid development web framework, for use in building dynamic web sites with PHP.[5]


CodeIgniter is loosely based on the popular model–view–controller (MVC) development pattern. While controller classes are a necessary part of development under CodeIgniter, models and views are optional.[6] CodeIgniter can be also modified to use Hierarchical Model View Controller (HMVC[7]) which allows the developers to maintain modular grouping of Controller, Models and View arranged in a sub-directory format.

CodeIgniter is most often noted for its speed when compared to other PHP frameworks.[8][9][10] In a critical take on PHP frameworks in general, PHP creator Rasmus Lerdorf spoke at frOSCon in August 2008, noting that he liked CodeIgniter "because it is faster, lighter and the least like a framework."[11]

Source code and license

CodeIgniter's source code is maintained at GitHub,[12] and as of the preview version 3.0rc, is certified open source software licensed with the MIT License. Versions of CodeIgniter prior to 3.0.0 are licensed under a proprietary Apache/BSD-style open source license.[13]

A 2011 decision to switch licensing to the Open Software License (OSL) sparked some community controversy,[14] especially about the GPL incompatibility of the new license, to which EllisLab has responded with a series of articles entitled Software License Awareness Week.[15]


The first public version of CodeIgniter was released by EllisLab on February 28, 2006.[16]

On July 9, 2013, EllisLab announced that it was seeking a new owner for CodeIgniter, citing a lack of resources to give the framework the attention they felt it deserved.[17] On October 6, 2014, EllisLab announced that CodeIgniter would continue development under the stewardship of the British Columbia Institute of Technology.[18] As of October 23, 2019, with the CodeIgniter Foundation taking the reins, CodeIgniter is no longer under the care of the British Columbia Institute of Technology.[19]

CodeIgniter 4 was released On February 24, 2020,[20] the birthday of Jim Parry, the project lead of CodeIgniter 4, and who died on January 15, 2020.[21] Since then, the project continues with another lead.

See also


  1. ^ "The CodeIgniter Foundation is finally here". 2019-10-23. Retrieved 2020-06-10.
  2. ^ "CodeIgniter Releases". Retrieved 2023-10-26.
  3. ^ "Server Requirements — CodeIgniter 3.1.11 documentation". Archived from the original on 2019-07-11. Retrieved 2017-06-23.
  4. ^ "Server Requirements — CodeIgniter 4.x documentation".
  5. ^ "CodeIgniter – The lightweight of the PHP frameworks". IONOS Digitalguide. Retrieved 2022-03-30.
  6. ^ "CodeIgniter User Guide: Models". Archived from the original on 2015-02-03. Retrieved 2015-02-03.
  7. ^ "wiredesignz / codeigniter-modular-extensions-hmvc — Bitbucket". Retrieved 2016-05-05.
  8. ^ "7 Best PHP Frameworks". 2014-02-12.
  9. ^ "PHP Frameworks Benchmarks". Archived from the original on 2014-12-15. Retrieved 2014-08-05.
  10. ^ "Benchmark update: Cake vs. CodeIgniter vs. Kohana". 2008-09-03. Archived from the original on 2014-06-14. Retrieved 2014-08-05.
  11. ^ "Rasmus Lerdorf: PHP Frameworks? Think Again". 2008-08-29. Retrieved 2014-08-05.
  12. ^ "bcit-ci/CodeIgniter · GitHub". Retrieved 2015-02-03.
  13. ^ "CodeIgniter License Agreement". Retrieved 2016-02-28.
  14. ^ "CodeIgniter changes license to OSL 3.0?". Forum. 2011-10-21. Archived from the original on 2014-08-08. Retrieved 2014-08-05.
  15. ^ "Software License Awareness Week". 2011-10-31. Archived from the original on 2016-03-22. Retrieved 2012-12-28.
  16. ^ "CodeIgniter User Guide: Change Log". Archived from the original on 2016-03-22. Retrieved 2016-03-21.
  17. ^ "EllisLab Seeking New Owner for CodeIgniter - Blog". ExpressionEngine.
  18. ^ "Your Favorite PHP Framework, CodeIgniter, Has a New Home". EllisLab Blog. EllisLab. Archived from the original on 17 October 2014. Retrieved 16 October 2014.
  19. ^ "The CodeIgniter Foundation is finally here". 2019-10-23. Retrieved 2020-06-10.
  20. ^ "CodeIgniter 4.0 is here!". Retrieved 2020-02-24.
  21. ^ "Important News about Jim Parry and the Project". Retrieved 2020-01-15.