Contact::getTopIdsInCompatibilityMode

protected function getTopIdsInCompatibilityMode(
	int $limit,
	array $order = [],
	array $filter = []
): array
{
	$dbResult = \CCrmContact::GetListEx(
		$order,
		$filter,
		false,
		$limit > 0 ? ['nTopCount' => $limit] : false,
		['ID']
	);

	$results = [];
	while ($fields = $dbResult->Fetch())
	{
		$results[] = (int)$fields['ID'];
	}

	return $results;
}