说明：  Yii 是一个高性能，基于组件的 PHP 框架，用于快速开发现代 Web 应用程序。 名字 Yii （读作 易）在中文里有“极致简单与不断演变”两重含义， 也可看作 Yes It Is! 的缩写。
(Yii is a high-performance, component-based PHP framework for rapid development of modern Web applications. The name Yii (pronounced Yi) has the double meaning of "extreme simplicity and constant evolution" in Chinese, and can also be regarded as the abbreviation of Yes It Is!)