php - 如何在邮件主题中设置变音符 ü

Question

我需要生成包含变音字符的德语电子邮件。这在电子邮件本身中非常有效，但在电子邮件的主题中却行不通。我尝试了许多不同的变音字母，除了 ü 之外，它们似乎都有效。我还尝试了不同的邮件库(HTMLMimeMail 和 PHPMailer)，但它们都失败了:

$mail = new htmlMimeMail();
$mail->setTextEncoding("base64");
$mail->setHTMLEncoding("base64");
$mail->setTextCharset("UTF-8");
$mail->setHTMLCharset("UTF-8");
$mail->setHeadCharset("UTF-8");
$mail->setSMTPParams(mailinglist_smtp_host,mailinglist_smtp_port);
$mail->setHtml("test");
$mail->setFrom("test@test.nl");    

$mail->setSubject("The ï, ö, ë, ä, and é work, but when adding the ü it doesn't");

$recipients[] = "me@myhost.nl";    
$mail->send($recipients);

&

$mail = new PHPMailer();
$mail->IsMail();
$mail->FromName = 'test';
$mail->From = 'test@test.nl';
$mail->AddAddress("me@myhost.nl");
$mail->Subject = "The ï, ö, ë, ä, and é work, but when adding the ü it doesn't";
$mail->Body = "test";    
$mail->Send();

谁能帮我找到这个问题的根源和解决办法？

Answer 1

你应该 quoted-printable对主题标题进行编码。

像这样:

$mail->Subject = "=?UTF-8?Q?" . quoted_printable_encode("The ï, ö, ë, ä, and é work, but when adding the ü it doesn't") . "?=";

在 PHP 中引用可打印编码:http://www.php.net/manual/en/function.quoted-printable-encode.php

编辑:$mail->CharSet = "UTF-8"; 完成了这项工作。