Symfony: Deliver mobile version of a template without loosing the file specific sf_format parameter

I needed a Server-Based mobile switch for my symfony-project. The solutions I found all used a workaround with setting the sf_format parameter to a specific mobile version. But what if you are using sf_format already for different view-types?

My Solution will use the Extension, so you can have multiple view-templates like:

• actionSuccess.mobile.php
• actionSuccess.php
• actionSuccess.mobile.xml.php
• actionSuccess.xml.php

I hope this is useful for somebdody! You might want to specify more parameters or make this a filter.