QpContentEncoder example

return $str;
    }

    private function getEncoder(): ContentEncoderInterface
    {
        if ('8bit' === $this->encoding) {
            return self::$encoders[$this->encoding] ??= new EightBitContentEncoder();
        }

        if ('quoted-printable' === $this->encoding) {
            return self::$encoders[$this->encoding] ??= new QpContentEncoder();
        }

        return self::$encoders[$this->encoding] ??= new Base64ContentEncoder();
    }

    private function chooseEncoding(): string
    {
        if (null === $this->charset) {
            return 'base64';
        }

        

return $str;
    }

    private function getEncoder(): ContentEncoderInterface
    {
        if ('8bit' === $this->encoding) {
            return self::$encoders[$this->encoding] ??= new EightBitContentEncoder();
        }

        if ('quoted-printable' === $this->encoding) {
            return self::$encoders[$this->encoding] ??= new QpContentEncoder();
        }

        return self::$encoders[$this->encoding] ??= new Base64ContentEncoder();
    }

    private function chooseEncoding(): string
    {
        if (null === $this->charset) {
            return 'base64';
        }