yii2

Python 2025-07-21

Yii 2 is a modern framework designed to be a solid foundation for your PHP application.

It is fast, secure and efficient and works right out of the box pre-configured with reasonable defaults. The framework is easy to adjust to meet your needs, because Yii has been designed to be flexible.

Installation

  • The minimum required PHP version of Yii is PHP 7.3.
  • It works best with PHP 8.
  • Follow the Definitive Guide in order to get step by step instructions.

Documentation

  • A Definitive Guide and a Class Reference cover every detail of the framework.
  • There is a PDF version of the Definitive Guide and a Definitive Guide Mirror which is updated every 15 minutes.
  • For Yii 1.1 users, there is Upgrading from Yii 1.1 to get an idea of what has changed in 2.0.

Versions & PHP compatibility

See "Release Cycle" at the website.

Community

  • Participate in discussions at forums.
  • Community Slack and Chat in IRC.
  • Follow us on Facebook, Twitter and GitHub.
  • Check other communities.

Contributing

The framework is Open Source powered by an excellent community.

You may join us and:

  • Report an issue
  • Translate documentation or messages
  • Give us feedback or start a design discussion
  • Contribute to the core code or fix bugs
  • Become a sponsor

Reporting Security issues

Please refer to a special page at the website describing proper workflow for security issue reports.

Directory Structure

build/               internally used build tools
docs/                documentation
framework/           core framework code
tests/               tests of the core framework code

Spreading the Word

Acknowledging or citing Yii 2 is as important as direct contributions.

In presentations

If you are giving a presentation or talk featuring work that makes use of Yii 2 and would like to acknowledge it, we suggest using our logo on your title slide.

In projects

If you are using Yii 2 as part of an OpenSource project, a way to acknowledge it is to use a special badge in your README:

If your code is hosted at GitHub, you can place the following in your README.md file to get the badge:

[![Yii2](https://img.sh**ie*lds.io/badge/Powered_by-Yii_Framework-green.svg?style=flat)](https://www.yiiframework.com/)

Sponsoring

Support this project by becoming a sponsor or a backer.

下载源码

通过命令行克隆项目:

git clone https://github.com/yiisoft/yii2.git