Ah yeah, that makes sense then. I was looking for that in Knp.

On Wed, Oct 02, 2013 at 01:36:06PM -0700, David Buchmann wrote:
>    In bundles/menu/voters.rst:
> 
>  > @@ -0,0 +1,237 @@
>  > +.. index::
>  > +    single: current menu item; MenuBundle;
>  > +
>  > +Current Menu Item Voters
>  > +========================
>  > +
>  > +One of the aims of any menu system is to inform the user about where they are
>  > +in relation to the rest of the site. To do this the system needs to know which of
>  > +its menu items correspond to the page the user is currently viewing.
>  > +
>  > +The KnpMenuBundle will identify a current menu item if the current request URI
>  > +matches the URI of the menu item.
> 
>    not exactly sure but i found
>    $menuItem->setCurrentUri($this->request->getRequestUri()); in
>    PhpcrMenuProvider. i guess afterwards "something" looks at the current uri
>    and compares that with the item uri (maybe the model itself?)
> 
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> References
> 
>    Visible links
>    1. https://github.com/symfony-cmf/symfony-cmf-docs/pull/183/files#r6727166