DoD::getParticipantsIds

private function getParticipantsIds(int $groupId, array $participantsCodes): array
{
	$participantsIds = [];

	$scrumMasterRole = 'M';

	$group = Workgroup::getById($groupId);

	$scrumMasterId = (int) $group->getScrumMaster();

	foreach ($participantsCodes as $code)
	{
		if (mb_substr($code, 0, 1) === 'U')
		{
			$userId = (int) mb_substr($code, 1);
			if (!in_array($userId, $participantsIds))
			{
				$participantsIds[] = $userId;
			}
		}
		elseif (preg_match('/^SG([0-9]+)_?([AEKM])?$/', $code, $match) && isset($match[2]))
		{
			$role = $match[2];
			if ($role === $scrumMasterRole)
			{
				$participantsIds[] = $scrumMasterId;
			}
			else
			{
				$participantsIds = array_merge(
					$participantsIds,
					$this->getSonetUserIds($groupId, $role, $scrumMasterId)
				);
			}
		}
	}

	return $participantsIds;
}