/**
* Retrieves universally unique ID (UUID) of current user.
*
* @return string UUID of user e.g. for storing related data in a database
*/
public function getUUID()
{
$uuid = $this->getProperty('uuid');
if (strlen(trim($uuid)) < 36) {
$uuid = uuid::createRandom();
$this->setProperty('uuid', $uuid);
}
return $uuid;
}
