/**
* Serialize PhpPresentation object to XML
*
* @param PhpPresentation $pPhpPresentation
* @param string $pFilename
* @return string XML Output
* @throws \Exception
*/
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();
}
