Yii

For other uses, see YII (disambiguation).

Yii

Yii logo
Stable release	2.0.7 / February 14, 2016 (2016-02-14)
Development status	Active
Written in	PHP
Operating system	Cross-platform
Type	Web application framework
License	New BSD License
Website	www.yiiframework.com

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 acronym for "Yes It Is!".

History

Yii started an attempt to fix 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 private 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. In May 2011 the developers decided to use new PHP versions and fix architectural mistakes. This led to version 2.0 to which the first commit was made in the same month. In May 2013 the Yii 2.0 code went public, followed by the first stable release of Yii 2.0 in October 2014. The current version 2.0.7 also supports PHP7.

Features

Yii features include:

• Model-View-Controller (MVC) design pattern.
• Generation of complex WSDL service specifications and management of Web service request handling.
• Internationalization and localization (I18N and L10N), comprising message translation, date and time formatting, number formatting, and interface localization.
• Layered caching scheme, which supports data caching, page caching, fragment caching and dynamic content. The storage medium of caching can be changed.
• Error handling and logging. Log messages can be categorized, filtered and routed to different destinations.
• Security measures include prevention of cross-site scripting (XSS), cross-site request forgery (CSRF) and cookie tampering.
• Unit and functionality testing based on PHPUnit and Selenium.
• Automatic code generation for the skeleton application, CRUD applications, through the Gii tool.
• Code generated by Yii components and command line tools complies to the XHTML standard.
• Designed to work well with third-party code. For example, it's possible to include code from PEAR or the Zend Framework.

Version history

Color	Meaning
Red	Old version; no longer supported
Yellow	Old version; still supported
Green	Current version
Blue	Future version

Version	Release	Release date	End of maintenance	Requirement
1.0	1.0	December 3, 2008	December 31, 2010	PHP 5.1.0 or above
	1.0.1	January 4, 2009
	1.0.2	February 1, 2009
	1.0.3	March 1, 2009
	1.0.4	April 5, 2009
	1.0.5	May 10, 2009
	1.0.6	June 7, 2009
	1.0.7	July 5, 2009
	1.0.8	August 9, 2009
	1.0.9	September 6, 2009
	1.0.10	October 18, 2009
	1.0.11	December 13, 2009
	1.0.12	March 14, 2010
1.1	1.1.0	January 10, 2010	December 31, 2016	PHP 5.1.0 or above
	1.1.1	March 14, 2010
	1.1.2	May 2, 2010
	1.1.3	July 4, 2010
	1.1.4	September 5, 2010
	1.1.5	November 14, 2010
	1.1.6	January 16, 2011
	1.1.7	March 27, 2011
	1.1.8	June 26, 2011
	1.1.9	January 1, 2012
	1.1.10	February 12, 2012
	1.1.11	July 29, 2012
	1.1.12	August 19, 2012
	1.1.13	December 30, 2012
	1.1.14	August 11, 2013
	1.1.15	June 29, 2014
	1.1.16	December 21, 2014
	1.1.17	January 13, 2016
2.0	2.0.0	October 12, 2014	TBD	PHP 5.4.0 or above
	2.0.1	December 7, 2014
	2.0.2	January 11, 2015
	2.0.3	March 1, 2015
	2.0.4	May 10, 2015
	2.0.5	July 11, 2015
	2.0.6	August 5, 2015
	2.0.7	February 14, 2016
	2.0.8	April 28, 2016

Extensions

The Yii project includes a repository of user-contributed extensions.

There was also an official extension library, zii, which was eventually merged with the core framework; it has been bundled in every release since Yii version 1.1.0, and includes additional behaviors and widgets, such as grids and jQuery UI.

Documentation

Yii comes with a collection of official documentation, such as a tutorial to develop a simple blog application, a guide that gives the description of every feature and a class reference which gives every detail about properties, methods and events.

There's also a user-contributed documentation, most of which is available within the wiki on the official website.

Licensing

Yii is released under the New BSD License (3-clause license). This means that it's possible to use it for free to develop either open-source or proprietary Web applications.

The text contained in the Official Yii Documentation is licensed to the public under the GNU Free Documentation License (GFDL). In general, the Yii documentation content can be copied, modified, and redistributed so long as the new version grants the same freedoms to others and acknowledges the authors of the Yii documentation article used.

The logo is licensed under a Creative Commons Attribution-No Derivative Works 3.0 Unported License.

See also

• Active record pattern
• Comparison of web frameworks
• Model–view–controller
• Scaffold (programming)

External links

• Yii official website
• Yii Extensions
• Yii Documentation
• The Definitive Guide to Yii
• Yii Forum
• Yii on github
• Thailand Yii community
• Russian Yii community
• Ukrainian Yii community
• Italian Yii community
• YiiAnswers - a community-driven question-and-answer site for Yii
• Yiitard - practical Yii development blog
• Yii development blog (yiinotes)
• Ext4Yii - an ExtJS extension for Yii
• Faster Yii API documentation
• Vietnamese Yii Community
• Technology Benefits of Yii Framework
• Yii Community in spanish
• Why Choose Yii Framework