使用Zend_Mail时添加附件的正确方法是什么？当我尝试在发送的邮件中打开附加的pDF时,我不断收到以下错误：“无法提取嵌入字体’BAAAAAA ArialMT’.某些字符可能无法正确显示或打印.” PDF仅显示表格但不显示任何字符.

这非常奇怪,因为如果我直接从服务器或我的本地主机下载它,PDF会打开.

这是我用来发送附件的代码：

$htML = $view->render('email/invoice.phtml');
$mail = new Zend_Mail("utf-8");

$file = PubLIC_PATH . DS . 'data' . DS . $invoice . '.pdf';
$at = new Zend_Mime_Part(file_get_contents($file));
$at->filename = basename($file);
$at->disposITion = Zend_Mime::DISPOSITION_ATTACHMENT;
$at->encoding = Zend_Mime::ENCODING_8BIT;
$mail->addAttachment($at);

/* Here i add the attachment */
$mail->setBodyHtml($html);
$mail->addTo($order->email,'Factura '. $invoice . ' '.Zend_Registry::get('siteName'));
$mail->setFrom('vanzari@anunt.COM',Zend_Registry::get('siteName'));
$mail->setSubject('Factura '. $invoice . ' '.Zend_Registry::get('siteName'));
$mail->send();

$mail = new Zend_Mail();
$mail->setBodyHtml("description");
$mail->setFrom('id','name');
$mail->addTo(email,name);
$mail->setSubject(subject);

$content = file_get_contents("path to pdf file"); // e.g. ("attachment/abc.pdf")
$attachment = new Zend_Mime_Part($content);
$attachment->tyPE = 'application/pdf';
$attachment->disposition = Zend_Mime::DISPOSITION_ATTACHMENT;
$attachment->encoding = Zend_Mime::ENCODING_BASE64;
$attachment->filename = 'filename.pdf'; // name of file

$mail->addAttachment($attachment);                  

$mail->send();