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 best practices and protocols found in modern Web application development.

Yii 2 is not ready for production use yet. We may make significant changes without prior notices. We expect to make the first stable release of Yii 2 in early 2014.

If you mainly want to learn Yii with no real project development requirement, we highly recommend you start with Yii 2 as it will be our main focus for the next few years.

If you have a real project with tight schedule, you should stick to Yii 1.1 which is the latest stable release of Yii.

  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

The minimum requirement by Yii is that your Web server supports PHP 5.4.

A draft of the Definitive Guide is available.

API docs and a rendering of the definitive guide are currently available at https://stuff.cebe.cc/yii2docs/ (updated four times per hour). We will make guide and API docs available on yiiframework.com with the beta release.

For 1.1 users, you may refer to Upgrading from Yii 1.1 to have a general idea of what has changed in 2.0.

Your participation to Yii 2 development is very welcome!

You may participate in the following ways:

• Report issues
• Give us feedback or start a design discussion
• 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.