Pimcore\Model\Element\Service::getUniqueKey PHP Method

    public static function getUniqueKey($element)
    {
        if ($element instanceof Object\AbstractObject) {
            return Object\Service::getUniqueKey($element);
        } elseif ($element instanceof Document) {
            return Document\Service::getUniqueKey($element);
        } elseif ($element instanceof Asset) {
            return Asset\Service::getUniqueKey($element);
        }
    }