voku / portable-utf8

      $haystack = self::substr($haystack, $offset);

    }

    if (($pos = strpos($haystack, $needle)) !== false) {

      $left = substr($haystack, 0, $pos);

      // negative offset not supported in PHP strpos(), ignoring

      return ($offset > 0 ? $offset : 0) + self::strlen($left);

    }

    return false;

  }

      $haystack = self::substr($haystack, 0, $offset);

    }

    if (($pos = strrpos($haystack, $needle)) !== false) {

      $left = substr($haystack, 0, $pos);

      // negative offset not supported in PHP strpos(), ignoring

      return ($offset > 0 ? $offset : 0) + self::strlen($left);

    }

    return false;

  }