code: public function get($param = null, $or = null)
      {
          if ($param === null) {
              return (isset(self::$cfg[$this->file])) ? self::$cfg[$this->file] : null;
          }
  
          return (isset(self::$cfg[$this->file][$param]) and !empty(self::$cfg[$this->file][$param])) ? self::$cfg[$this->file][$param] : $or;
      }
docs: @param null $param
  @param null $or
  
  @return mixed|null