Base::filterDataByChanging

protected function filterDataByChanging(array &$data, array $previousData)
{
	foreach ($data as $key => $value)
	{
		if (!isset($previousData[$key]))
		{
			continue;
		}

		if ($previousData[$key] !== $data[$key])
		{
			continue;
		}

		unset($data[$key]);
	}

	return count($data) > 0;
}