private function getPkColumn()
    {
        if (isset($this->options[self::GRID_PARAM_PK])) {
            return $this->options[self::GRID_PARAM_PK];
        } else {
            return false;
        }
    }
private function getPkColumn()
    {
        if (isset($this->options[self::GRID_PARAM_PK])) {
            return $this->options[self::GRID_PARAM_PK];
        } else {
            return false;
        }
    }
private function getPkColumn ( ) { if ( isset ( $ this -> options [ self :: GRID_PARAM_PK ] ) ) { return $ this -> options [ self :: GRID_PARAM_PK ] ; } else { return false ; } }
Returns PK column name

@return string
Returns PK column name