Yii

Yii is a free, open-source Web application development framework written in PHP5 that promotes clean, DRY design and encourages rapid development. Yii works to streamline the application development and helps to ensure an extremely efficient, extensible, and maintainable end product.Being extremely performance optimized, Yii is a perfect choice for any sized project.

However, Yii has been built with sophisticated, enterprise applications in mind. One have full control over the configuration from head-to-toe (presentation-to-persistence) to conform to the enterprise development guidelines. Yii comes packaged with tools to help test and debug the application, and has clear and comprehensive documentation.

Yii is a high-performance PHP framework best for developing Web 2.0 applications.Yii comes with rich features: MVC, DAO/ActiveRecord, I18N/L10N, caching, authentication and role-based access control, scaffolding, testing, etc. Yii can reduce the development time significantly. Yii only loads the features that is needed.

Yii has powerful caching support. Yii is explicitly designed to work efficiently with AJAX. Security comes as standard with Yii. Yii includes input validation, output filtering, SQL injection and Cross-site scripting prevention. Yii helps you develop clean and reusable code. Yii follows the MVC pattern, ensuring a clear separation of logic and presentation.