session_start(); //si ça te donne un message d'erreur de "SESSION ALREADY STARTED" supprime cette ligne
  //beggin mobile detecte class
      $detect = new Mobile_Detect();
      $_SHOP->isMobile =  $detect->isMobile();
    if ($detect->isMobile()) {
    if(isset($_GET['desktop'])){ //Lien de demande de la version desktop
        if(!isset($_SESSION['desk'])){
            $_SESSION['desk']=1;
            $_SHOP->theme_name = "default";
        }
    }else{
            if(isset($_SESSION['desk']) && $_SESSION['desk'])
                $_SHOP->theme_name = "default";
            else
                $_SHOP->theme_name = "default_mobile";
    }
      }else {
         // this selects the theme that you like to use.
         $_SHOP->theme_name = "default";
         //end mobile detecte
      }