- The minimum required PHP version of Yii is PHP 5.4.
- It works best with PHP 7.
- [Follow the Definitive Guide](http://www.yiiframework.com/doc-2.0/guide-start-installation.html)
- [Follow the Definitive Guide](https://www.yiiframework.com/doc-2.0/guide-start-installation.html)
in order to get step by step instructions.
Documentation
-------------
- 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) cover every detail
- A [Definitive Guide](https://www.yiiframework.com/doc/guide/2.0) and
a [Class Reference](https://www.yiiframework.com/doc/api/2.0) cover every detail
of the framework.
- There is a [PDF version](http://stuff.cebe.cc/yii2-guide.en.pdf) of the Definitive Guide
- There is a [PDF version](https://www.yiiframework.com/doc/download/yii-guide-2.0-en.pdf) of the Definitive Guide
and a [Definitive Guide Mirror](http://stuff.cebe.cc/yii2docs/) which is updated every 15 minutes.
- For Yii 1.1 users, there is [Upgrading from Yii 1.1](docs/guide/intro-upgrade-from-v1.md)
- For Yii 1.1 users, there is [Upgrading from Yii 1.1](https://www.yiiframework.com/doc/guide/2.0/en/intro-upgrade-from-v1)
to get an idea of what has changed in 2.0.
Community
---------
- Participate in [discussions at forums](http://www.yiiframework.com/forum/).
- [Community Slack](https://join.slack.com/t/yii/shared_invite/MjIxMjMxMTk5MTU1LTE1MDE3MDAwMzMtM2VkMTMyMjY1Ng) and [Chat in IRC](http://www.yiiframework.com/chat/).
- Participate in [discussions at forums](https://www.yiiframework.com/forum/).
- [Community Slack](https://join.slack.com/t/yii/shared_invite/MjIxMjMxMTk5MTU1LTE1MDE3MDAwMzMtM2VkMTMyMjY1Ng) and [Chat in IRC](https://www.yiiframework.com/chat/).
- Follow us on [Facebook](https://www.facebook.com/groups/yiitalk/), [Twitter](https://twitter.com/yiiframework)