// Install behavior into application config (/config/main.php)
return array(
    // ...
    'behaviors'=>array(
        'home'=>array(
            'class'=>'ext.yiiext.behaviors.getUrl.EGetUrlBehavior',
            // whether returned url be absolute. Defaults to false.
            'useAbsolute'=>true,
        ),
        'publicFilesUrl'=>array(
            'class'=>'ext.yiiext.behaviors.getUrl.EGetUrlBehavior',
            'useAbsolute'=>true,
            // the base url for files (without slashes)
            'baseUrl'=>'public',
        ),
    ),
    // ...
);

echo '1. '.Yii::app()->home;
echo '2. '.Yii::app()->home->getUrl('favicon.ico');
echo '3. '.Yii::app()->getUrl('favicon.ico');
echo '4. '.Yii::app()->home->getUrl('css/main.css');
echo '5. '.Yii::app()->publicFilesUrl;
echo '6. '.Yii::app()->publicFilesUrl->getUrl('logo.png');