protected function _addRow(PHPExcel $phpexcel, array $row, $rowIndex) {
        $col = 0;
        foreach ($row as $key => $value) {
            $colIndex = $col++;
            if (is_array($value)) {
                $rowset = $value;
                $value = array();
                foreach ($rowset as $row) {
                    if (is_array($row)) {
                        $values = array_values($row);
                        $values = implode(' : ', $values);
                    } else {
                        $values = $row;
                    }
                    $value[] = $values;
                }
                $value = implode("\n", $value);
            }
            $phpexcel->getActiveSheet()->setCellValueByColumnAndRow($colIndex, $rowIndex, $value);
        }
    }