Yii is an open source, object-oriented, component-based MVC PHP web application framework.
YII stands for Yes It Is
Yii is a high-performance PHP framework best for developing Web 2.0 applications.
Yii helps Web developers build complex applications and deliver them on-time.
Yii is a free, open-source Web application development framework written in PHP5 that promotes clean, DRY design and encourages rapid development. It works to streamline your application development and helps to ensure an extremely efficient, extensible, and maintainable end product.
Yii Features
1)Fast
2)CRUD Feature
3)Database tables as objects
4) Easy Form Validation
5) Great support for Jquery and ajax.
6) Inbuilt Authentication and Authorization
7) Theming
8) Web Services(API Support).
9) Caching
10) Error Handling
11) Security
12) Extensions
13) Testing
14) Great Documentation