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Stable release
2.0.48[1] / 2023-05-22[±]
RepositoryYII Repository
Written inPHP
Operating systemCross-platform
TypeWeb application framework
LicenseNew BSD License

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]


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 2.0.48 was released in May 2023.[5]

Version history

Color Meaning
Red Old version; no longer supported
Yellow Old version; still supported
Green Current version
Blue Future version
Version Release date End of active support[6] End of security/compatibility support Requirement[6]
1.0 December 3, 2008 December 31, 2010 PHP 5.1.0 or above
1.1 January 10, 2010 December 31, 2016 December 31, 2023 PHP 5.1.0 or above
2.0 October 12, 2014 TBD TBD PHP 5.4.0 or above
3.0 TBD TBD TBD PHP 7.4.0 or above


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


  1. ^ "Yii 2.0.48". Retrieved 2023-05-25.
  2. ^ "About Yii". Yii2 Guide. yiisoft.
  3. ^ "What's Yii - CyberBukit TTS". Retrieved 2022-02-22.
  4. ^ "Yiisoft/Yii2". GitHub. 5 March 2022.
  5. ^ "Yii 2.0.48". 22 May 2023. Retrieved 2023-05-25.
  6. ^ a b "Download Yii Framework". Retrieved 18 January 2011.
  7. ^ "Yii".