Section::getSectionsMapIds

private function getSectionsMapIds(array $data): array
{
	$sectionMapIds = [];
	foreach ($data as $key => $values)
	{
		if ($key == get_class() && is_array($values))
		{
			$sectionMapIds = $sectionMapIds + $this->getSectionsMapIds($values);
		}
		elseif (is_int($key))
		{
			$sectionMapIds[$key] = $values;
		}
	}
	return $sectionMapIds;
}