Yii is a high performance component based PHP framework for developing large scale web applications. This is an acronym for "Yes It Is!". This is often the accurate, and most concise response to inquires from those new to Yii: Is it fast? ... Is it secure? ... Is it professional? ... Is it right for my next project? ... Yes, it is!
Yii only loads the features that you need. It has powerful caching support. It is explicitly designed to work efficiently with AJAX.
Security comes as standard with Yii. It includes input validation, output filtering, SQL injection and Cross-site scripting prevention.
Yii helps you develop clean and reusable code. It follows the MVC pattern, ensuring a clear separation of logic and presentation.