voku / portable-utf8

      }

      // $start

      if (is_array($start) === true) {

        $start = array_slice($start, 0, $num);

        foreach ($start as &$valueTmp) {

          $valueTmp = (int)$valueTmp === $valueTmp ? $valueTmp : 0;

        }

        unset($valueTmp);

      } else {

        $start = array_pad(array($start), $num, $start);

      }

      // $length

      if (!isset($length)) {

      // $length

      if (!isset($length)) {

        $length = array_fill(0, $num, 0);

      } elseif (is_array($length) === true) {

        $length = array_slice($length, 0, $num);

        foreach ($length as &$valueTmpV2) {

          if (isset($valueTmpV2)) {

            $valueTmpV2 = (int)$valueTmpV2 === $valueTmpV2 ? $valueTmpV2 : $num;

          } else {

            $valueTmpV2 = 0;

          }

        }

        unset($valueTmpV2);

      } else {

        $length = array_pad(array($length), $num, $length);

      }