Vendor/phpspreadsheet/phpoffice/phpspreadsheet/src/PhpSpreadsheet/Writer/Xlsx/StringTable.php
public function writeStringTable(array $pStringTable)
    {
        // Create XML writer
        $objWriter = null;
        if ($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', 'yes');

        // String table
        $objWriter->startElement('sst');
        $objWriter->writeAttribute('xmlns', 'http://schemas.openxmlformats.org/spreadsheetml/2006/main');
        $objWriter->writeAttribute('uniqueCount', count($pStringTable));

        // Loop through string table
        foreach ($pStringTable as $textElement) {
            $objWriter->startElement('si');

            if (!$textElement instanceof RichText) {
                $textToWrite = StringHelper::controlCharacterPHP2OOXML($textElement);
                $objWriter->startElement('t');
                if ($textToWrite !== trim($textToWrite)) {
                    $objWriter->writeAttribute('xml:space', 'preserve');
                }
                $objWriter->writeRawData($textToWrite);
                $objWriter->endElement();
            } elseif ($textElement instanceof RichText) {
                $this->writeRichText($objWriter, $textElement);
            }

            $objWriter->endElement();
        }

        $objWriter->endElement();

        return $objWriter->getData();
    }
public function writeStringTable(array $pStringTable)
    {
        // Create XML writer
        $objWriter = null;
        if ($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', 'yes');

        // String table
        $objWriter->startElement('sst');
        $objWriter->writeAttribute('xmlns', 'http://schemas.openxmlformats.org/spreadsheetml/2006/main');
        $objWriter->writeAttribute('uniqueCount', count($pStringTable));

        // Loop through string table
        foreach ($pStringTable as $textElement) {
            $objWriter->startElement('si');

            if (!$textElement instanceof RichText) {
                $textToWrite = StringHelper::controlCharacterPHP2OOXML($textElement);
                $objWriter->startElement('t');
                if ($textToWrite !== trim($textToWrite)) {
                    $objWriter->writeAttribute('xml:space', 'preserve');
                }
                $objWriter->writeRawData($textToWrite);
                $objWriter->endElement();
            } elseif ($textElement instanceof RichText) {
                $this->writeRichText($objWriter, $textElement);
            }

            $objWriter->endElement();
        }

        $objWriter->endElement();

        return $objWriter->getData();
    }
Write string table to XML format.

@param string[] $pStringTable

@throws WriterException

@return string XML Output