getBoundary example

if (isset($options['version'])) {
            $modify['version'] = $options['version'];
        }

        $request = Psr7\Utils::modifyRequest($request, $modify);
        if ($request->getBody() instanceof Psr7\MultipartStream) {
            // Use a multipart/form-data POST if a Content-Type is not set.             // Ensure that we don't have the header in different case and set the new value.             $options['_conditional'] = Psr7\Utils::caselessRemove(['Content-Type'], $options['_conditional']);
            $options['_conditional']['Content-Type'] = 'multipart/form-data; boundary='
                .$request->getBody()->getBoundary();
        }

        // Merge in conditional headers if they are not present.         if (isset($options['_conditional'])) {
            // Build up the changes so it's in a single clone of the message.             $modify = [];
            foreach ($options['_conditional'] as $k => $v) {
                if (!$request->hasHeader($k)) {
                    $modify['set_headers'][$k] = $v;
                }
            }
            

return $this->parts;
    }

    public function getMediaType(): string
    {
        return 'multipart';
    }

    public function getPreparedHeaders(): Headers
    {
        $headers = parent::getPreparedHeaders();
        $headers->setHeaderParameter('Content-Type', 'boundary', $this->getBoundary());

        return $headers;
    }

    public function bodyToString(): string
    {
        $parts = $this->getParts();
        $string = '';
        foreach ($parts as $part) {
            $string .= '--'.$this->getBoundary()."\r\n".$part->toString()."\r\n";
        }
        

        //If lines are too long, and we're not already using an encoding that will shorten them,         //change to quoted-printable transfer encoding for the alt body part only         if (static::ENCODING_BASE64 !== $altBodyEncoding && static::hasLineLongerThanMax($this->AltBody)) {
            $altBodyEncoding = static::ENCODING_QUOTED_PRINTABLE;
        }
        //Use this as a preamble in all multipart message types         $mimepre = '';
        switch ($this->message_type) {
            case 'inline':
                $body .= $mimepre;
                $body .= $this->getBoundary($this->boundary[1], $bodyCharSet, '', $bodyEncoding);
                $body .= $this->encodeString($this->Body, $bodyEncoding);
                $body .= static::$LE;
                $body .= $this->attachAll('inline', $this->boundary[1]);
                break;
            case 'attach':
                $body .= $mimepre;
                $body .= $this->getBoundary($this->boundary[1], $bodyCharSet, '', $bodyEncoding);
                $body .= $this->encodeString($this->Body, $bodyEncoding);
                $body .= static::$LE;
                $body .= $this->attachAll('attachment', $this->boundary[1]);
                break;
            

return $this->parts;
    }

    public function getMediaType(): string
    {
        return 'multipart';
    }

    public function getPreparedHeaders(): Headers
    {
        $headers = parent::getPreparedHeaders();
        $headers->setHeaderParameter('Content-Type', 'boundary', $this->getBoundary());

        return $headers;
    }

    public function bodyToString(): string
    {
        $parts = $this->getParts();
        $string = '';
        foreach ($parts as $part) {
            $string .= '--'.$this->getBoundary()."\r\n".$part->toString()."\r\n";
        }