PhpOffice\PhpPresentation\PhpPresentation::getSlideCount PHP Method

    public function getSlideCount()
    {
        return count($this->slideCollection);
    }

 /**
  * Save PhpPresentation to file
  *
  * @param  string    $pFilename
  * @throws \Exception
  */
 public function save($pFilename)
 {
     if (empty($pFilename)) {
         throw new \Exception("Filename is empty.");
     }
     if (!is_null($this->presentation)) {
         // Create new ZIP file and open it for writing
         $objZip = new \ZipArchive();
         // Try opening the ZIP file
         if ($objZip->open($pFilename, \ZipArchive::CREATE) !== true) {
             if ($objZip->open($pFilename, \ZipArchive::OVERWRITE) !== true) {
                 throw new \Exception("Could not open " . $pFilename . " for writing.");
             }
         }
         // Add media
         $slideCount = $this->presentation->getSlideCount();
         for ($i = 0; $i < $slideCount; ++$i) {
             for ($j = 0; $j < $this->presentation->getSlide($i)->getShapeCollection()->count(); ++$j) {
                 if ($this->presentation->getSlide($i)->getShapeCollection()->offsetGet($j) instanceof AbstractDrawing) {
                     $imgTemp = $this->presentation->getSlide($i)->getShapeCollection()->offsetGet($j);
                     $objZip->addFromString('media/' . $imgTemp->getFilename(), file_get_contents($imgTemp->getPath()));
                 }
             }
         }
         // Add PhpPresentation.xml to the document, which represents a PHP serialized PhpPresentation object
         $objZip->addFromString('PhpPresentation.xml', $this->writeSerialized($this->presentation, $pFilename));
         // Close file
         if ($objZip->close() === false) {
             throw new \Exception("Could not close zip file {$pFilename}.");
         }
     } else {
         throw new \Exception("PhpPresentation object unassigned.");
     }
 }