Vendor/phpspreadsheet/phpoffice/phpspreadsheet/src/PhpSpreadsheet/Writer/Xlsx/Workbook.php
private function writeDefinedNameForPrintTitles(XMLWriter $objWriter, Worksheet $pSheet, $pSheetId = 0)
    {
        // definedName for PrintTitles
        if ($pSheet->getPageSetup()->isColumnsToRepeatAtLeftSet() || $pSheet->getPageSetup()->isRowsToRepeatAtTopSet()) {
            $objWriter->startElement('definedName');
            $objWriter->writeAttribute('name', '_xlnm.Print_Titles');
            $objWriter->writeAttribute('localSheetId', $pSheetId);

            // Setting string
            $settingString = '';

            // Columns to repeat
            if ($pSheet->getPageSetup()->isColumnsToRepeatAtLeftSet()) {
                $repeat = $pSheet->getPageSetup()->getColumnsToRepeatAtLeft();

                $settingString .= '\'' . str_replace("'", "''", $pSheet->getTitle()) . '\'!$' . $repeat[0] . ':$' . $repeat[1];
            }

            // Rows to repeat
            if ($pSheet->getPageSetup()->isRowsToRepeatAtTopSet()) {
                if ($pSheet->getPageSetup()->isColumnsToRepeatAtLeftSet()) {
                    $settingString .= ',';
                }

                $repeat = $pSheet->getPageSetup()->getRowsToRepeatAtTop();

                $settingString .= '\'' . str_replace("'", "''", $pSheet->getTitle()) . '\'!$' . $repeat[0] . ':$' . $repeat[1];
            }

            $objWriter->writeRawData($settingString);

            $objWriter->endElement();
        }
    }
private function writeDefinedNameForPrintTitles(XMLWriter $objWriter, Worksheet $pSheet, $pSheetId = 0)
    {
        // definedName for PrintTitles
        if ($pSheet->getPageSetup()->isColumnsToRepeatAtLeftSet() || $pSheet->getPageSetup()->isRowsToRepeatAtTopSet()) {
            $objWriter->startElement('definedName');
            $objWriter->writeAttribute('name', '_xlnm.Print_Titles');
            $objWriter->writeAttribute('localSheetId', $pSheetId);

            // Setting string
            $settingString = '';

            // Columns to repeat
            if ($pSheet->getPageSetup()->isColumnsToRepeatAtLeftSet()) {
                $repeat = $pSheet->getPageSetup()->getColumnsToRepeatAtLeft();

                $settingString .= '\'' . str_replace("'", "''", $pSheet->getTitle()) . '\'!$' . $repeat[0] . ':$' . $repeat[1];
            }

            // Rows to repeat
            if ($pSheet->getPageSetup()->isRowsToRepeatAtTopSet()) {
                if ($pSheet->getPageSetup()->isColumnsToRepeatAtLeftSet()) {
                    $settingString .= ',';
                }

                $repeat = $pSheet->getPageSetup()->getRowsToRepeatAtTop();

                $settingString .= '\'' . str_replace("'", "''", $pSheet->getTitle()) . '\'!$' . $repeat[0] . ':$' . $repeat[1];
            }

            $objWriter->writeRawData($settingString);

            $objWriter->endElement();
        }
    }
Write Defined Name for PrintTitles.

@param XMLWriter $objWriter XML Writer
@param Worksheet $pSheet
@param int $pSheetId