CTasks::getMembers

static function getMembers(int $taskId): array
{
	$members = array_fill_keys(MemberTable::possibleTypes(), []);

	$membersResult = CTaskMembers::GetList([], ['TASK_ID' => $taskId]);
	while ($member = $membersResult->Fetch())
	{
		$members[$member['TYPE']][] = $member['USER_ID'];
	}

	return $members;
}