public static function macAddress(string $value): bool
    {
        $result = filter_var($value, FILTER_VALIDATE_MAC);
        return is_string($result) && $value === $result;
    }
public static function macAddress(string $value): bool
    {
        $result = filter_var($value, FILTER_VALIDATE_MAC);
        return is_string($result) && $value === $result;
    }
public static function macAddress ( string $ value ) : bool { $ result = filter_var ( $ value , FILTER_VALIDATE_MAC ) ; return is_string ( $ result ) && $ value === $ result ; }
Is mac-address.

@param string $value
@return bool
Is mac - address .