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. [](https://packagist.org/packages/yiisoft/yii2) [](https://packagist.org/packages/yiisoft/yii2) [](https://www.versioneye.com/php/yiisoft:yii2/references) [](http://travis-ci.org/yiisoft/yii2) [](https://www.versioneye.com/php/yiisoft:yii2/dev-master) [](http://hhvm.h4cc.de/package/yiisoft/yii2-dev) [](https://scrutinizer-ci.com/g/yiisoft/yii2/) [](https://scrutinizer-ci.com/g/yiisoft/yii2/) [](https://codeclimate.com/github/yiisoft/yii2) DIRECTORY STRUCTURE ------------------- ``` apps/ ready-to-use application templates advanced/ a template suitable for building sophisticated Web applications basic/ a template suitable for building simple Web applications benchmark/ an application demonstrating the performance of Yii build/ internally used build tools docs/ documentation extensions/ extensions 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).