说明：  　yii框架官方版是BSD License下发布的一个开源项目，也就是您能免费使用它开发开源或私有的Web应用程序。yii框架官方版作为一款高性能，基于组件的php框架
(The official version of the Yii framework is an open source project released under the BSD License, which allows you to develop open source or private Web applications for free. The official version of Yii framework as a high performance, component-based PHP framework)