Yii is an open source project released under the terms of the BSD License. This means that you can use Yii for free to develop either open-source or proprietary Web applications.
Currently there are two versions of Yii: 1.1 and 2.0.
Yii 1.1 is the latest stable version. You may safely use this version in your production Web applications. Continued support and bug fixes for this version will be provided until December 31, 2015 or further if needed.
|Yii Framework 1.1.x|
|Latest Release||1.1.15 (Jun 29, 2014)|
change log, upgrade instructions
|Documentation||yii-docs-1.1.15.022a51.tar.gz (.zip file)|
|Requirement||PHP 5.1.0 or above|
|End of Maintenance||Dec 31, 2015 (may be extended further if needed)|
|Release History||download archived releases|
You can obtain the latest development version of Yii from GitHub repository using the following URL:
You can also obtain the latest Yii source code via SVN using:
svn checkout https://github.com/yiisoft/yii/trunk/ yii
The latest version of Yii 2 is 2.0.0 beta, released on April 13, 2014.
Yii 2.0 is a complete rewrite of Yii on top of PHP 5.4.0. It is aimed to become a state-of-the-art of the new generation of PHP framework. Yii 2.0 is not compatible with 1.1.
Yii 2.0 is not ready for production use yet. It is currently under heavy development and we may introduce significant changes without prior notices. You may consider using Yii 2.0 if you just start to learn Yii or you do not have a tight project schedule.
Yii 2.0 is released in terms of application templates. Each application template is a skeleton Web application built on Yii 2.0 and is ready to use out of box. We currently provide two application templates: the basic application template and the advanced application template.
This is the preferred way of installing Yii 2.0. If you do not have Composer yet, you may install it by following the instructions here.
To install the basic application template, run the command below:
php composer.phar create-project yiisoft/yii2-app-basic basic 2.0.0-betaTo install the advanced application template, run the command below:
php composer.phar create-project yiisoft/yii2-app-advanced advanced 2.0.0-beta
Download one of the following archive files, and then extract it to a Web-accessible folder: