echajoa/vendor/phpoffice/phppresentation/samples/Sample_14_Zoom.php

<?php

include_once 'Sample_Header.php';

use PhpOffice\PhpPresentation\PhpPresentation;
use PhpOffice\PhpPresentation\Style\Alignment;
use PhpOffice\PhpPresentation\Style\Color;

// Create new PHPPresentation object
echo date('H:i:s') . ' Create new PHPPresentation object' . EOL;
$objPHPPresentation = new PhpPresentation();

// Set the zoom to 200%
$objPHPPresentation->getPresentationProperties()->setZoom(3);

// Create slide
echo date('H:i:s') . ' Create slide'.EOL;
$currentSlide = $objPHPPresentation->getActiveSlide();
$currentSlide->addShape(clone $oShapeDrawing);
$currentSlide->addShape(clone $oShapeRichText);

// Save file
echo write($objPHPPresentation, basename(__FILE__, '.php'), $writers);
if (!CLI) {
	include_once 'Sample_Footer.php';
}