protected static function isValidSequence(string $sequence): bool
    {
        return strlen($sequence) != strcspn($sequence, self::$force_enclosure);
    }
protected static function isValidSequence(string $sequence): bool
    {
        return strlen($sequence) != strcspn($sequence, self::$force_enclosure);
    }
protected static function isValidSequence ( string $ sequence ) : bool { return strlen ( $ sequence ) != strcspn ( $ sequence , self :: $ force_enclosure ) ; }
Filter type and sequence parameters.

The sequence to force enclosure MUST contains one of the following character ("\n\r\t ")
Filter type and sequence parameters .