PhpOffice\PhpPresentation\Reader\PowerPoint2007::loadViewProperties PHP Method

    protected function loadViewProperties($sPart)
    {
        $xmlReader = new XMLReader();
        if ($xmlReader->getDomFromString($sPart)) {
            $pathZoom = '/p:viewPr/p:slideViewPr/p:cSldViewPr/p:cViewPr/p:scale/a:sx';
            if (is_object($oElement = $xmlReader->getElement($pathZoom))) {
                if ($oElement->hasAttribute('d') && $oElement->hasAttribute('n')) {
                    $this->oPhpPresentation->getPresentationProperties()->setZoom($oElement->getAttribute('n') / $oElement->getAttribute('d'));
                }
            }
        }
    }