function largest($first, $second, $third) {
      $output = $first;
      if ($second > $output) {
        $output = $second;
      }
      if ($third > $output) {
        $output = $third;
      }

      return $output;
    }

    function smallest($first, $second, $third) {
      $output = $first;
      if ($second < $output) {
        $output = $second;
      }
      if ($third < $output) {
        $output = $third;
      }

      return $output;
    }