php - Symfony2 Load content based on device used with LiipThemeBundle -

i need make controller load different skin information based on device being used with. can load templates liipbundle. wonder if can load content too?? example controller:

public function mainaction() {       $em = $this->getdoctrine()->getmanager();     $skins = $em->getrepository('mediaparkltskinbundle:skin')->findoneby( array('id' => 1));      return $this->render('mediaparkltmainbundle:main:main.html.twig', array('skin' => $skins));      return array(); } 

right loads skin id 1 on theme. need make if statement , check if user on desktop, if load theme skin... how can that??? here idea:

 public function mainaction() {          (if using desktop) {          $em = $this->getdoctrine()->getmanager();         $skins = $em->getrepository('mediaparkltskinbundle:skin')->findoneby( array('id' => 1));          return $this->render('mediaparkltmainbundle:main:main.html.twig', array('skin' => $skins));         }          else {             $em = $this->getdoctrine()->getmanager();             $skins = $em->getrepository('mediaparkltskinbundle:skin')->findoneby( array('id' => 2));              return $this->render('mediaparkltmainbundle:phone:phonemain.html.twig', array('skin' => $skins));          }          return array();     } 

how can make happen?

inspect user agent see if there indications of mobile. or search library this.

see $_server['http_user_agent']