Yii is a high-performance PHP framework best for developing Web 2.0 applications.

Ref:http://www.yiiframework.com/download/

Ref:http://www.yiiframework.com/doc-2.0/guide-index.html

PHP Framework

PHP Framework is built for PHP developers who need elegant toolkit to create full-featured web applications. It aims to speed up the creation and maintenance, and also to replace the repetitive coding tasks by power, control and pleasure.

Ref:http://www.phpkode.com/projects/category/php-development-framework/

目前主流的开发框架

OpenbizCubiPHP

CakePHP

ZendFramework

CodeIgniter

Symfony

YiiFramework

ThinkPHP

YiiFramework(PHP)

原文：http://www.cnblogs.com/stuart/p/4460923.html