问PHPMailer不发送pdf附件

EN

$filename = 'Buchung-Nr.' . $booking_id . '.pdf';
$path = $system->SETTINGS['siteurl'] . 'bookings/';
$outputfile = 'bookings/Buchung-Nr.' . $booking_id . '.pdf';
$pdfout = $pdf->Output($outputfile, 'F');

$bodytext = 'Vielen Dank für Ihre Buchung';

require $include_path . 'phpmailer/src/Exception.php';
require $include_path . 'phpmailer/src/PHPMailer.php';
require $include_path . 'phpmailer/src/SMTP.php';

$mail = new PHPMailer();
$replytotext = 'Ostsee-Deluxe - Buchung-Nr.' . $booking_id;
try {
    //Server settings
    $mail->isSMTP();                                            //Send using SMTP
    $mail->Host       = 'sslout.df.eu';                 //Set the SMTP server to send through
    $mail->SMTPSecure = "TLS";
    $mail->SMTPAuth   = true;
    $mail->CharSet = 'UTF-8';                              //Enable SMTP authentication
    $mail->Username   = 'USERNAME-HIDDEN';                     //SMTP username
    $mail->Password   = 'PW-HIDDEN';                               //SMTP password
    $mail->Port       = 25;                                    //TCP port to connect to, use 465 for `PHPMailer::ENCRYPTION_SMTPS` above

    //Recipients
    $mail->setFrom('kontakt@ostsee-deluxe.com', 'Ostsee-Deluxe');
    $mail->addAddress($email, $fullname);     //Add a recipient
    $mail->addReplyTo('kontakt@ostsee-deluxe.com', $replytotext);
    $mail->addBCC('kontakt@ostsee-deluxe.com');

    //Attachments
    $mail->addAttachment($path/$filename);    //Optional name
    var_dump($path,$filename);
    //Content
    $mail->isHTML(true);                                  //Set email format to HTML
    $mail->Subject = 'Buchungs-Nr. ' . $booking_id;
    $mail->Body    = $bodytext;
    $mail->AltBody = $bodytext_alt;

    $mail->send();
    
    echo 'Message has been sent';
} catch (Exception $e) {
    echo "Message could not be sent. Mailer Error: {$mail->ErrorInfo}";
}

$path = $system->SETTINGS['siteurl'] . 'bookings/'; to $path = 'bookings/';

$mail->addAttachment($path . $filename);    //Optional name