SlightPHP\PHPMailer::CreateBody PHP Method

    public function CreateBody()
    {
        $result = '';
        if ($this->sign_key_file) {
            $result .= $this->GetMailMIME();
        }
        $this->SetWordWrap();
        switch ($this->message_type) {
            case 'alt':
                $result .= $this->GetBoundary($this->boundary[1], '', 'text/plain', '');
                $result .= $this->EncodeString($this->AltBody, $this->Encoding);
                $result .= $this->LE . $this->LE;
                $result .= $this->GetBoundary($this->boundary[1], '', 'text/html', '');
                $result .= $this->EncodeString($this->Body, $this->Encoding);
                $result .= $this->LE . $this->LE;
                $result .= $this->EndBoundary($this->boundary[1]);
                break;
            case 'plain':
                $result .= $this->EncodeString($this->Body, $this->Encoding);
                break;
            case 'attachments':
                $result .= $this->GetBoundary($this->boundary[1], '', '', '');
                $result .= $this->EncodeString($this->Body, $this->Encoding);
                $result .= $this->LE;
                $result .= $this->AttachAll();
                break;
            case 'alt_attachments':
                $result .= sprintf("--%s%s", $this->boundary[1], $this->LE);
                $result .= sprintf("Content-Type: %s;%s" . "\tboundary=\"%s\"%s", 'multipart/alternative', $this->LE, $this->boundary[2], $this->LE . $this->LE);
                $result .= $this->GetBoundary($this->boundary[2], '', 'text/plain', '') . $this->LE;
                // Create text body
                $result .= $this->EncodeString($this->AltBody, $this->Encoding);
                $result .= $this->LE . $this->LE;
                $result .= $this->GetBoundary($this->boundary[2], '', 'text/html', '') . $this->LE;
                // Create the HTML body
                $result .= $this->EncodeString($this->Body, $this->Encoding);
                $result .= $this->LE . $this->LE;
                $result .= $this->EndBoundary($this->boundary[2]);
                $result .= $this->AttachAll();
                break;
        }
        if ($this->IsError()) {
            $result = '';
        } else {
            if ($this->sign_key_file) {
                $file = tempnam("", "mail");
                $fp = fopen($file, "w");
                fwrite($fp, $result);
                fclose($fp);
                $signed = tempnam("", "signed");
                if (@openssl_pkcs7_sign($file, $signed, "file://" . $this->sign_cert_file, array("file://" . $this->sign_key_file, $this->sign_key_pass), null)) {
                    $fp = fopen($signed, "r");
                    $result = '';
                    while (!feof($fp)) {
                        $result = $result . fread($fp, 1024);
                    }
                    fclose($fp);
                } else {
                    $this->SetError($this->Lang("signing") . openssl_error_string());
                    $result = '';
                }
                unlink($file);
                unlink($signed);
            }
        }
        return $result;
    }