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yiisoft / yii2 Public

Yii 2: The Fast, Secure and Professional PHP Framework

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Scrutinizer Quality Score

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

Yii2 Version	PHP version	Development status	EOL ¹
	>= 5.4,	security fixes only	23 Nov 2026 ³
>= 2.0.50	>= 7.3,	bug fixes and security fixes only	bugfixes till 23 Nov 2026 ³, security fixes till 21 Nov 2027 ⁴
>= 2.2.0 ²	>= 8.1	active development

¹ All mentioned dates may be subject to change and no rights can be derived from them.
² Note: Yii 2.1 was skipped, Yii 2.2 has not yet been released.
³ PHP 8.3 EOL date.
⁴ Expected PHP 8.4 EOL date.

Community

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

Contributing

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.shields.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.