bookings start placeholder

function my_em_bookings_start($replace, $EM_Event, $result){
        if ( $result == '#_BOOKINGSSTART' ) {
                $bookingsstart = "";
                foreach( $EM_Event->get_tickets()->tickets as $EM_Ticket ){
                  $bookingsstart .= $EM_Ticket->ticket_start;
                }
                $replace = $bookingsstart;
        }
        return $replace;
}
add_filter('em_event_output_placeholder','my_em_bookings_start', 1, 4);