Thank you for choosing Yii - a high-performance component-based PHP framework.
If you are looking for a production-ready PHP framework, please use Yii v1.1.
Yii 2.0 is still under heavy development. We may make significant changes without prior notices. Yii 2.0 is not ready for production use yet.
The minimum requirement by Yii is that your Web server supports PHP 5.3.?.