Scalr\Service\Aws\Client\SoapClient::_generateGuid PHP Method

    protected static function _generateGuid($prefix = 'pfx')
    {
        $uuid = md5(uniqid(rand(), true));
        $guid = $prefix . substr($uuid, 0, 8) . "-" . substr($uuid, 8, 4) . "-" . substr($uuid, 12, 4) . "-" . substr($uuid, 16, 4) . "-" . substr($uuid, 20, 12);
        return $guid;
    }