code: public function addToFD($arr = array(), $exceptStr = "", $reverse = false)
      {
          $this->loadToFD($arr, $exceptStr, $reverse, false);
      }
docs: @brief
  call loadToFd() without clearing $arr
  @param array $arr array to load
  @param string $exceptStr exception keys, delimited by comma
  @param boolean $reverse reverse exception, use only $exceptStr keys in result