Yii PHP Framework Version 2
===========================
Thank you for choosing Yii 2 - a modern PHP framework designed for professional Web development.
Yii 2 is a complete rewrite of its previous version Yii 1.1 which is one of the most popular PHP frameworks.
Yii 2 inherits the main spirit behind Yii for being simple, fast and highly extensible.
Yii 2 requires PHP 5.4 and embraces the best practices and protocols found in modern Web application development.
[![Latest Stable Version ](https://poser.pugx.org/yiisoft/yii2/v/stable.png )](https://packagist.org/packages/yiisoft/yii2)
[![Total Downloads ](https://poser.pugx.org/yiisoft/yii2/downloads.png )](https://packagist.org/packages/yiisoft/yii2)
[![Reference Status ](https://www.versioneye.com/php/yiisoft:yii2/reference_badge.svg )](https://www.versioneye.com/php/yiisoft:yii2/references)
[![Build Status ](https://secure.travis-ci.org/yiisoft/yii2.png )](http://travis-ci.org/yiisoft/yii2)
[![Dependency Status ](https://www.versioneye.com/php/yiisoft:yii2/dev-master/badge.png )](https://www.versioneye.com/php/yiisoft:yii2/dev-master)
[![HHVM Status ](http://hhvm.h4cc.de/badge/yiisoft/yii2-dev.png )](http://hhvm.h4cc.de/package/yiisoft/yii2-dev)
[![Code Coverage ](https://scrutinizer-ci.com/g/yiisoft/yii2/badges/coverage.png?s=31d80f1036099e9d6a3e4d7738f6b000b3c3d10e )](https://scrutinizer-ci.com/g/yiisoft/yii2/)
[![Scrutinizer Quality Score ](https://scrutinizer-ci.com/g/yiisoft/yii2/badges/quality-score.png?s=b1074a1ff6d0b214d54fa5ab7abbb90fc092471d )](https://scrutinizer-ci.com/g/yiisoft/yii2/)
[![Code Climate ](https://codeclimate.com/github/yiisoft/yii2.png )](https://codeclimate.com/github/yiisoft/yii2)
DIRECTORY STRUCTURE
-------------------
```
build/ internally used build tools
docs/ documentation
framework/ core framework code
tests/ tests of the core framework code
```
REQUIREMENTS
------------
The minimum requirement by Yii is that your Web server supports PHP 5.4.
DOCUMENTATION
-------------
Yii 2.0 has a [Definitive Guide ](http://www.yiiframework.com/doc-2.0/guide-index.html ) and
a [Class Reference ](http://www.yiiframework.com/doc-2.0/index.html ) which cover every detail of Yii.
There is also a [PDF version ](http://stuff.cebe.cc/yii2-guide.pdf ) of the Definitive Guide
and a [Definitive Guide Mirror ](http://stuff.cebe.cc/yii2docs/ ) which update every 15 minutes.
For 1.1 users, you may refer to [Upgrading from Yii 1.1 ](docs/guide/intro-upgrade-from-v1.md )
to have a general idea of what has changed in 2.0.
HOW TO PARTICIPATE
------------------
**Your participation to Yii 2 development is very welcome!**
You may participate in the following ways:
* [Report issues ](https://github.com/yiisoft/yii2/issues )
* [Give us feedback or start a design discussion ](http://www.yiiframework.com/forum/index.php/forum/42-design-discussions-for-yii-20/ )
* Fix issues, develop features, write/polish documentation
- Before you start, please adopt an existing issue (labelled with "ready for adoption") or start a new one to avoid duplicated efforts.
- Please submit a merge request after you finish development.
In order to make it easier we've prepared [special `yii2-dev` Composer package ](https://github.com/yiisoft/yii2/blob/master/docs/internals/getting-started.md ).