Vendor/phpspreadsheet/phpoffice/phpspreadsheet/src/PhpSpreadsheet/Writer/Ods/Settings.php
public function write(Spreadsheet $spreadsheet = null)
    {
        $objWriter = null;
        if ($this->getParentWriter()->getUseDiskCaching()) {
            $objWriter = new XMLWriter(XMLWriter::STORAGE_DISK, $this->getParentWriter()->getDiskCachingDirectory());
        } else {
            $objWriter = new XMLWriter(XMLWriter::STORAGE_MEMORY);
        }

        // XML header
        $objWriter->startDocument('1.0', 'UTF-8');

        // Settings
        $objWriter->startElement('office:document-settings');
        $objWriter->writeAttribute('xmlns:office', 'urn:oasis:names:tc:opendocument:xmlns:office:1.0');
        $objWriter->writeAttribute('xmlns:xlink', 'http://www.w3.org/1999/xlink');
        $objWriter->writeAttribute('xmlns:config', 'urn:oasis:names:tc:opendocument:xmlns:config:1.0');
        $objWriter->writeAttribute('xmlns:ooo', 'http://openoffice.org/2004/office');
        $objWriter->writeAttribute('office:version', '1.2');

        $objWriter->startElement('office:settings');
        $objWriter->startElement('config:config-item-set');
        $objWriter->writeAttribute('config:name', 'ooo:view-settings');
        $objWriter->startElement('config:config-item-map-indexed');
        $objWriter->writeAttribute('config:name', 'Views');
        $objWriter->endElement();
        $objWriter->endElement();
        $objWriter->startElement('config:config-item-set');
        $objWriter->writeAttribute('config:name', 'ooo:configuration-settings');
        $objWriter->endElement();
        $objWriter->endElement();
        $objWriter->endElement();

        return $objWriter->getData();
    }
public function write(Spreadsheet $spreadsheet = null)
    {
        $objWriter = null;
        if ($this->getParentWriter()->getUseDiskCaching()) {
            $objWriter = new XMLWriter(XMLWriter::STORAGE_DISK, $this->getParentWriter()->getDiskCachingDirectory());
        } else {
            $objWriter = new XMLWriter(XMLWriter::STORAGE_MEMORY);
        }

        // XML header
        $objWriter->startDocument('1.0', 'UTF-8');

        // Settings
        $objWriter->startElement('office:document-settings');
        $objWriter->writeAttribute('xmlns:office', 'urn:oasis:names:tc:opendocument:xmlns:office:1.0');
        $objWriter->writeAttribute('xmlns:xlink', 'http://www.w3.org/1999/xlink');
        $objWriter->writeAttribute('xmlns:config', 'urn:oasis:names:tc:opendocument:xmlns:config:1.0');
        $objWriter->writeAttribute('xmlns:ooo', 'http://openoffice.org/2004/office');
        $objWriter->writeAttribute('office:version', '1.2');

        $objWriter->startElement('office:settings');
        $objWriter->startElement('config:config-item-set');
        $objWriter->writeAttribute('config:name', 'ooo:view-settings');
        $objWriter->startElement('config:config-item-map-indexed');
        $objWriter->writeAttribute('config:name', 'Views');
        $objWriter->endElement();
        $objWriter->endElement();
        $objWriter->startElement('config:config-item-set');
        $objWriter->writeAttribute('config:name', 'ooo:configuration-settings');
        $objWriter->endElement();
        $objWriter->endElement();
        $objWriter->endElement();

        return $objWriter->getData();
    }
Write settings.xml to XML format.

@param Spreadsheet $spreadsheet

@throws \PhpOffice\PhpSpreadsheet\Writer\Exception

@return string XML Output