Vendor/phpspreadsheet/phpoffice/phpspreadsheet/src/PhpSpreadsheet/Writer/Xlsx/Worksheet.php
private function writeBreaks(XMLWriter $objWriter, PhpspreadsheetWorksheet $pSheet)
    {
        // Get row and column breaks
        $aRowBreaks = [];
        $aColumnBreaks = [];
        foreach ($pSheet->getBreaks() as $cell => $breakType) {
            if ($breakType == PhpspreadsheetWorksheet::BREAK_ROW) {
                $aRowBreaks[] = $cell;
            } elseif ($breakType == PhpspreadsheetWorksheet::BREAK_COLUMN) {
                $aColumnBreaks[] = $cell;
            }
        }

        // rowBreaks
        if (!empty($aRowBreaks)) {
            $objWriter->startElement('rowBreaks');
            $objWriter->writeAttribute('count', count($aRowBreaks));
            $objWriter->writeAttribute('manualBreakCount', count($aRowBreaks));

            foreach ($aRowBreaks as $cell) {
                $coords = Coordinate::coordinateFromString($cell);

                $objWriter->startElement('brk');
                $objWriter->writeAttribute('id', $coords[1]);
                $objWriter->writeAttribute('man', '1');
                $objWriter->endElement();
            }

            $objWriter->endElement();
        }

        // Second, write column breaks
        if (!empty($aColumnBreaks)) {
            $objWriter->startElement('colBreaks');
            $objWriter->writeAttribute('count', count($aColumnBreaks));
            $objWriter->writeAttribute('manualBreakCount', count($aColumnBreaks));

            foreach ($aColumnBreaks as $cell) {
                $coords = Coordinate::coordinateFromString($cell);

                $objWriter->startElement('brk');
                $objWriter->writeAttribute('id', Coordinate::columnIndexFromString($coords[0]) - 1);
                $objWriter->writeAttribute('man', '1');
                $objWriter->endElement();
            }

            $objWriter->endElement();
        }
    }
private function writeBreaks(XMLWriter $objWriter, PhpspreadsheetWorksheet $pSheet)
    {
        // Get row and column breaks
        $aRowBreaks = [];
        $aColumnBreaks = [];
        foreach ($pSheet->getBreaks() as $cell => $breakType) {
            if ($breakType == PhpspreadsheetWorksheet::BREAK_ROW) {
                $aRowBreaks[] = $cell;
            } elseif ($breakType == PhpspreadsheetWorksheet::BREAK_COLUMN) {
                $aColumnBreaks[] = $cell;
            }
        }

        // rowBreaks
        if (!empty($aRowBreaks)) {
            $objWriter->startElement('rowBreaks');
            $objWriter->writeAttribute('count', count($aRowBreaks));
            $objWriter->writeAttribute('manualBreakCount', count($aRowBreaks));

            foreach ($aRowBreaks as $cell) {
                $coords = Coordinate::coordinateFromString($cell);

                $objWriter->startElement('brk');
                $objWriter->writeAttribute('id', $coords[1]);
                $objWriter->writeAttribute('man', '1');
                $objWriter->endElement();
            }

            $objWriter->endElement();
        }

        // Second, write column breaks
        if (!empty($aColumnBreaks)) {
            $objWriter->startElement('colBreaks');
            $objWriter->writeAttribute('count', count($aColumnBreaks));
            $objWriter->writeAttribute('manualBreakCount', count($aColumnBreaks));

            foreach ($aColumnBreaks as $cell) {
                $coords = Coordinate::coordinateFromString($cell);

                $objWriter->startElement('brk');
                $objWriter->writeAttribute('id', Coordinate::columnIndexFromString($coords[0]) - 1);
                $objWriter->writeAttribute('man', '1');
                $objWriter->endElement();
            }

            $objWriter->endElement();
        }
    }
Write Breaks.

@param XMLWriter $objWriter XML Writer
@param PhpspreadsheetWorksheet $pSheet Worksheet