Period::getErrorSingle

static function getErrorSingle(array $input, $values)
{
	if(!is_array($values))
		throw new ArgumentTypeException('values', 'array');

	self::checkArgs($input, $values);

	$errors = array();

	if ($error = InputManager::getError($input["ITEMS"]["FROM"], $values["FROM"]))
		$errors = $error;

	if ($error = InputManager::getError($input["ITEMS"]["TO"], $values["TO"]))
		$errors = array_merge($errors, $error);

	if ($error = InputManager::getError($input["ITEMS"]["TYPE"], $values["TYPE"]))
		$errors = array_merge($errors, $error);

	return $errors;
}