Framework is a set of functions that can ease your work. Functions are commonly grouped into Classes.One of the most,best and high performance PHP frameworks, Yii is fast, secure and extremely professional for developing Web 2.0 applications and much more. It is equipped with rich features including MVC, DAO/Active record etc. Some of its other features include I18N/L10N, testing, scaffolding, authentication and role based access control. It can shorten development time quite significantly for all software or application development.
For a high performance framework, Yii’s breadth of capabilities and feature set is quite extraordinary, and it’s one of the reasons I was attracted to the framework.
Yii is a high-performance, component-based PHP framework for developing large-scale Web applications rapidly. It enables maximum reusability in Web programming and can significantly accelerate your Web application development process.Yii is a generic Web programming framework that can be used for developing virtually any type of Web application. Because it is light-weight and equipped with sophisticated caching mechanisms, it is especially suited to high-traffic applications, such as portals, forums, content management systems (CMS), e-commerce systems, etc.You get the best yii2 frameworks at yiioverflow