PhpOffice\PhpPresentation\Writer\PowerPoint2007\AbstractSlide::getGUID PHP Method

    private function getGUID()
    {
        if (function_exists('com_create_guid')) {
            return com_create_guid();
        } else {
            mt_srand((double) microtime() * 10000);
            //optional for php 4.2.0 and up.
            $charid = strtoupper(md5(uniqid(rand(), true)));
            $hyphen = chr(45);
            // "-"
            $uuid = chr(123) . substr($charid, 0, 8) . $hyphen . substr($charid, 8, 4) . $hyphen . substr($charid, 12, 4) . $hyphen . substr($charid, 16, 4) . $hyphen . substr($charid, 20, 12) . chr(125);
            // "}"
            return $uuid;
        }
    }