OccupancyChecker::canFindIntersections

private function canFindIntersections(array $event, array $existingEvent): bool
{
	return
		($event['PARENT_ID'] ?? null) !== (int)($existingEvent['PARENT_ID'] ?? null)
		&& !empty($existingEvent['PARENT_ID'])
		&& !empty($existingEvent['DATE_FROM'])
		&& !empty($existingEvent['DATE_TO'])
		&& !empty($existingEvent['ID'])
	;
}