Symfony2 check

  private function checkBooking($booking){


        $em = $this->getDoctrine()->getManager();

        $reservations = $em->getRepository("AppBundle:Applicant")->findBy(array("date" => $booking->getDate(),"room" => $booking->getRoom()));
        $error = 0;
        foreach($reservations as $reservation){
            $timeStart = $reservation->getTimeStart()->format('H:i:s');
            $timeEnd = $reservation->getTimeEnd()->format('H:i:s');
            $bookingTimeStart = $booking->getTimeStart()->format('H:i:s');
            $bookingTimeEnd = $booking->getTimeEnd()->format('H:i:s');

            if($bookingTimeStart >= $timeStart && $bookingTimeStart <= $timeEnd){
                $error++;
            }
            if($bookingTimeEnd >= $timeStart && $bookingTimeEnd <= $timeEnd){
                $error++;
            }
            if($bookingTimeStart <= $timeStart && $bookingTimeEnd >= $timeEnd){
                $error++;
            }
        }
        if($error > 0){
            $this->text['error'][] = "Deze ruimte is al op deze tijd bezet.";
        }
        if($booking->getTimeEnd() < $booking->getTimeStart()){
            $this->text['error'][] = "De eind tijd kan niet minder zijn dan de start tijd.";
            $error++;
        }

        if($error == 0){
            $em->persist($booking);
            $em->flush();
        }
    }