1. 1. Yii is an efficient and user friendly framework. It's unit and functionality testing is based on PHP Unit and Selenium.
2. 2. Automatic code generation, cross-site scripting (XSS) prevention, error handling and logging, cross-site request forgery (CSRF) are some of its features.
3. 3. The version are indicated by various colors. Blue implies the Future version, green means the current version, yellow refers to the old version which is still supported whereas red the old version which is not supported.
4. 4. Yii Developer has ensured that the framework is carefully designed to work well with third-party code.