YII – Yes It Is
YII is a high-performance PHP framework best for developing large-scale Web applications.
Download the latest stable version from http://www.yiiframework.com/
Extract the folder and place it under the webroot location Eg., /var/www/ in linux and htdocs in windows
php <path to yii folder>/framework/yiic.php webapp <applicationname>
Additionally set the path for php in windows, the execute the above command to create a new application