nextcloud / server

		$notifyGroups = json_decode($this->config->getAppValue('updatenotification', 'notify_groups', '["admin"]'), true);

		$this->users = [];

		foreach ($notifyGroups as $group) {

			$groupToNotify = $this->groupManager->get($group);

			if ($groupToNotify instanceof IGroup) {

				foreach ($groupToNotify->getUsers() as $user) {

					$this->users[$user->getUID()] = true;

				}

			}

		}

		$this->users = array_keys($this->users);

		}

		if (!empty($groups)) {

			foreach ($groups as $gid) {

				$group = $this->groupManager->get($gid);

				if ($group instanceof IGroup) {

					foreach ($group->getUsers() as $user) {

						$users[] = $user->getUID();

					}

				}

			}

		}

		return array_unique($users);