public static function run($dataDir = null)
{
# Instantiate Presentation class that represents the presentation file
$pres = new Presentation();
# Instantiate SlideCollection calss
$slides = $pres->getSlides();
$i = 0;
while ($i < $pres->getLayoutSlides()->size()) {
# Add an empty slide to the Slides collection
$slides->addEmptySlide($pres->getLayoutSlides()->get_Item($i));
$i += 1;
}
#Do some work on the newly added slide
# Saving the presentation
$save_format = new SaveFormat();
$pres->save($dataDir . "EmptySlide.pptx", $save_format->Pptx);
print "Document has been created, please check the output file.";
}
