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.
The latest version of Yii 2 is 2.0.13, released on November 3, 2017. Yii 2.0 is a complete rewrite of Yii on top of PHP 5.4.0 as a minimum requirement and fully compatible with PHP 7.x. It is aimed to be a state-of-the-art of the new generation of PHP framework. Yii 2.0 is not compatible with 1.1.
There are two ways to install Yii 2: using Composer, or downloading an application template. We highly recommend you to use the former.
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.
Now choose one of the application templates to start installing Yii 2.0. An application template is a package that contains a skeleton Web application written in Yii.
php composer.phar create-project yiisoft/yii2-app-basic basic 2.0.13
php composer.phar create-project yiisoft/yii2-app-advanced advanced 2.0.13
Note that you may be prompted to enter your GitHub username and password during the installation process. This is normal. Just enter them and continue.
Download one of the following archive files, and then extract it to a Web-accessible folder:
If you are upgrading from Yii 2.0.0 with composer, simply run the following commands in your project's root directory:
First, make sure you have the latest version of the Composer Asset Plugin:
php composer.phar global require "fxp/composer-asset-plugin:^1.2.0"
Then upgrade Yii by running:
php composer.phar update yiisoft/yii2 yiisoft/yii2-composer bower-asset/jquery.inputmask
If you installed Yii using an archive file, you should download the new release file, extract it and replace the older version with the new one.
Upgrading from Yii 1.1 is not trivial. Please refer to the guide about upgrading from Yii 1.1.
Yii 1.1 is currently under maintenance mode. Continued support and bug fixes for this version has ended on December 31, 2016. Security fixes will be provided until December 31, 2019.
|Yii Framework 1.1.x|
|Latest Release||1.1.19 (June 8, 2017)|
change log, upgrade instructions
|Documentation||yii-docs-22.214.171.12490cb.tar.gz (.zip file)|
|Requirement||PHP 5.1.0 or above|
|End of Maintenance||Dec 31, 2016|
|Security support until||Dec 31, 2019 (may be extended further if needed)|
starting from version 1.1.14: release history on Github
until version 1.1.13: download archived releases from Google Code
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