Yii Framework is an open-source, high-performance PHP web application framework that provides a solid foundation for developing modern web applications. It uses the Model-View-Controller (MVC) architectural pattern and provides various features like authentication, authorization, caching, and database abstraction out of the box.
Laravel is a free, open-source PHP web application framework that follows the model–view–controller (MVC) architectural pattern. It provides an elegant syntax and tools needed for large, robust applications.