Article · Wikipedia archive · Last revised Jul 6, 2026

Yii

Yii is an open source, object-oriented, component-based MVC PHP web application framework. Yii is pronounced as "Yee" or [ji:] and in Chinese it means "simple and evolutionary" and it can be an acronym for "Yes It Is!".

Last revised
Jul 6, 2026
Read time
≈ 3 min
Length
787 w
Citations
11
Source
Yii
Stable release
3.01 / 2025-12-31[±]
Written inPHP
Operating systemCross-platform
TypeWeb application framework
LicenseNew BSD License
Websitewww.yiiframework.com
RepositoryYII Repository

Yii is an open source, object-oriented, component-based MVC PHP web application framework. Yii is pronounced as "Yee" or [ji:] and in Chinese it means "simple and evolutionary" and it can be an acronym for "Yes It Is!".2

History

Yii started as an attempt to fix perceived drawbacks of the PRADO framework: Slow handling of complex pages, steep learning curve and difficulty to customize many controls. In October 2006, after ten months of development, the first alpha version of Yii was released, followed by the formal 1.00 release in December 2008.

Yii 1.1 was released in January 2010 adding a form builder, relational Active record queries, a unit testing framework and more. The Yii community continues to follow the 1.1 branch with PHP7+ support and security fixes. The latest version 1.1.23 was released in December 2020.

In May 2011 the developers decided to use new PHP versions and fix architectural shortcomings, resulting in version 2.0.3 In May 2013 the Yii 2.0 code went public, followed by the first stable release in October 2014. PHP8 is supported since version 2.0.38.4 The latest version 2.0.51 was released in July 2024.5

Yii 3.0 was released in December 2025. Yii3 works with the PHP ecosystem in depth. It integrates with any PHP library. Yii3 uses modern PHP standards enabling the leverage of the ecosystem's innovation. The central part of the framework is its dependency injection container. It brings all the individual packages together, automatically resolving dependencies and helping to obtain classes requested. 1

Version history

Color Meaning
Red Old version; no longer supported
Yellow Old version; still supported
Green Current version
Blue Future version
Version Release date6 End of active support6 End of security/compatibility support6 Requirement6
1.0 December 3, 2008 December 31, 2010 PHP 5.1.0 or above
1.1 January 10, 2010 November 22, 2015 December 31, 2026 PHP 5.1.0 or above
2.0 October 12, 2014 30 May, 2024 23 November, 2027 PHP 7.4.0 or above
3.0 December 31, 2025 31 December, 2030 31 December, 2035 PHP 8.2.0 or above

Extensions

The Yii project includes a repository of user-contributed extensions in addition to an official extension library, zii, which was merged with the core framework;7 it has been bundled in every release since Yii version 1.1.0 and includes additional widgets such as grids and jQuery UI.

See also

See also

References

References

  1. "Yii3 is released". yiiframework.com. Retrieved 2026-01-06.
  2. "About Yii". Yii2 Guide. yiisoft.
  3. "What's Yii - CyberBukit TTS". tts.demo.cyberbukit.com. Archived from the original on 2022-02-22. Retrieved 2022-02-22.
  4. "Yiisoft/Yii2". GitHub. 5 March 2022.
  5. "Yii 2.0.51". www.yiiframework.com. 22 May 2023. Retrieved 2024-11-27.
  6. "Release Cycle".
  7. "Yii".
Bibliography

Bibliography

Books

Journals

  • Behme, Henning (January 2009). "World Wide Web". IX. Heise.
  • Winesett, Jeffrey (March 2009). "Adding the Yii Framework to Your Web Development Toolbox". PHP|architect.
  • Winesett, Jeffrey (July 2009). "Yii: Flex Your Flash". PHP|architect.
  • Kreußel, Peter (November 2009). "PHP-Frameworks im Überblick, Viel Holz für den Rahmen". Linux-Magazin. Linux New Media AG.
  • Setter, Matthew (December 2010). "YiiLocal – Find Stuff Near You". PHP|architect.
  • Moorjani, Philip (April 2014). "Introduction to Yii 2.0". PHP|architect.
External links