public function addToFD($arr = array(), $exceptStr = "", $reverse = false)
    {
        $this->loadToFD($arr, $exceptStr, $reverse, false);
    }
public function addToFD($arr = array(), $exceptStr = "", $reverse = false)
    {
        $this->loadToFD($arr, $exceptStr, $reverse, false);
    }
@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