PhpOffice\PhpPresentation\Writer\Serialized::writeSerialized PHP Method

    private function writeSerialized(PhpPresentation $pPhpPresentation = null, $pFilename = '')
    {
        // Clone $pPhpPresentation
        $pPhpPresentation = clone $pPhpPresentation;
        // Update media links
        $slideCount = $pPhpPresentation->getSlideCount();
        for ($i = 0; $i < $slideCount; ++$i) {
            for ($j = 0; $j < $pPhpPresentation->getSlide($i)->getShapeCollection()->count(); ++$j) {
                if ($pPhpPresentation->getSlide($i)->getShapeCollection()->offsetGet($j) instanceof AbstractDrawing) {
                    $pPhpPresentation->getSlide($i)->getShapeCollection()->offsetGet($j)->setPath('zip://' . $pFilename . '#media/' . $pPhpPresentation->getSlide($i)->getShapeCollection()->offsetGet($j)->getFilename(), false);
                }
            }
        }
        // Create XML writer
        $objWriter = new XMLWriter();
        $objWriter->openMemory();
        $objWriter->setIndent(true);
        // XML header
        $objWriter->startDocument('1.0', 'UTF-8', 'yes');
        // PhpPresentation
        $objWriter->startElement('PhpPresentation');
        $objWriter->writeAttribute('version', '##VERSION##');
        // Comment
        $objWriter->writeComment('This file has been generated using PhpPresentation v##VERSION## (http://github.com/PHPOffice/PhpPresentation). It contains a base64 encoded serialized version of the PhpPresentation internal object.');
        // Data
        $objWriter->startElement('data');
        $objWriter->writeCData(base64_encode(serialize($pPhpPresentation)));
        $objWriter->endElement();
        $objWriter->endElement();
        // Return
        return $objWriter->getData();
    }