RusPostSingle::getLastOperation

protected function getLastOperation(array $answer)
{
	$history = $answer['Envelope']['#']['Body'][0]['#']['getOperationHistoryResponse'][0]['#']['OperationHistoryData'][0]['#']['historyRecord'];

	if(!is_array($history) || empty($history))
		return null;

	if(!$lastOperation = end($history))
		return null;

	return $lastOperation;
}