Merge TIFF Images to PDF in PHP

$presentation = new Presentation();
try {
    $presentation->getSlides()->removeAt(0);
    $layoutSlide = $presentation->getLayoutSlides()->get_Item(0);

    $imagePaths = ["image1.tiff", "image2.tiff"];
    foreach ($imagePaths as $imagePath) {
        $slide = $presentation->getSlides()->addEmptySlide($layoutSlide);

        $sourceImage = Images::fromFile($imagePath);
        try {
            $presentationImage = $presentation->getImages()->addImage($sourceImage);
        } finally {
            $sourceImage->dispose();
        }

        $slide->getShapes()->addPictureFrame(
            ShapeType::Rectangle, 0, 0, 720, 540, $presentationImage);
    }

    $presentation->save("merged-images.pdf", SaveFormat::Pdf);
} finally {
    $presentation->dispose();
}