For a high performance framework, Yii’s breadth of capabilities and feature set is quite extraordinary, and it’s one of the reasons I was attracted to the framework. You can see and try some examples of Yii code in action at the Yii Playground.

Here are some highlights:

  • Model-View-Controller architecture. Just like Ruby on Rails, now you can leverage MVC in your PHP apps.
  • Database Access Objects (DAO), Active Record, and programmatic Database migrations simplify the challenges of building database-powered web applications.
  • Form input, validation, and Ajax support is built-in. Yii makes forms pretty easy.
  • Built-in authentication and powerful user management extensions make launching new web applications easy.
  • Yii’s built-in code generation tool, Gii, speeds your app’s development scaffolding in MVC fashion
  • Console Yii. You can run Yii from the command line or as a daemon. With this, it’s possible to build high performance background tasks in PHP.
  • Theming options such as the Bootstrap extension makes building great looking responsive apps much simpler
  • Layered caching support Yii makes it easy to implement the kinds of caching that make sense to your application
  • Security. Yii greatly minimizes the typical risk factors of running services with PHP and MySQL
  • Integration with other frameworks. It’s easy to use Zend or PEAR features in Yii
  • Extensions. Yii’s community offers a variety of free, open source plugins and widgets
  • Internationalization. Yii supports I18N and makes it easy to provide localized versions of your app.
  • Error handling, logging and testing – yes, Yii delivers.