使用pdf附件发送PHP电子邮件

试图发送PDF附件的电子邮件，尝试使用swiftmailer，并没有工作，这段代码工作与一个zip但不是PDF :(

$attachment = chunk_split(base64_encode(file_get_contents($filename)));
ob_start(); //Turn on output buffering 
?> 
--PHP-mixed-<?php echo $random_hash; ?>  
Content-Type: multipart/alternative; boundary="PHP-alt-<?php echo $random_hash; ?>" 

--PHP-alt-<?php echo $random_hash; ?>  
Content-Type: text/html; charset="iso-8859-1" 
Content-Transfer-Encoding: 7bit

<?php echo $message."<br /><br />";
?>

--PHP-alt-<?php echo $random_hash; ?>-- 

--PHP-mixed-<?php echo $random_hash; ?> 


Content-Type: application/octet-stream; name="<?php echo $filename?>"  
Content-Transfer-Encoding: base64  
Content-Disposition: attachment; filename="<?php echo $filename?>" 

<?php echo $attachment; ?> 
--PHP-mixed-<?php echo $random_hash; ?>-- 

<?php 
//copy current buffer contents into $message variable and delete current output buffer 
$message = ob_get_clean(); 
//send the email 
$mail_sent = @mail( $to, $subject, $message, $headers ); 

邮件得到正常发送，我得到的邮件：但附件不存在，并在meial所有的base64编码在电子邮件中，如：

ontent-Type：application / octet-stream; name =“media.pdf”Content-Transfer-Encoding：base64 Content-Disposition：attachment; 文件名= “media.pdf” JVBERi0xLjMKMSAwIG9iago8PCAvVHlwZSAvQ2F0YWxvZwovT3V0bGluZXMgMiAwIFIKL1BhZ2Vz IDMgMCBSID4 + CmVuZG9iagoyIDAgb2JqCjw8IC9UeXBlIC9PdXRsaW5lcyAvQ291bnQgMCA + PGPL bmRvYmoKMyAwIG9iago8PCAvVHlwZSAvUGFnZXMKL0tpZHMgWzYgMCBSCjE2IDAgUgpdCi9Db3Vu dCAyCi9SZXNvdXJjZXMgPDwKL1Byb2NTZXQgNCAwIFIKL0ZvbnQgPDwgCi9GMSA4IDAgUgovRjIg OSAwIFIKPj4KL1hPYmplY3QgPDwgCi9JMSAxMiAwIFIKL0kyIDE1IDAgUgovSTMgMjAgMCBSCi9J NCAyMyAwIFIKPj4KPj4KL01lZGlhQm94IFswLjAwMCAwLjAwMCA2MTIuMDAwIDc5Mi4wMDBdCiA + PgplbmRvYmoKNCAwIG9iagpbL1BERiAvVGV4dCAvSW1hZ2VDIF0KZW5kb2JqCjUgMCBvYmoKPDwK L0NyZWF0b3IgKERPTVBERikKL0NyZWF0aW9uRGF0ZSAoRDoyMDEzMDgyMzAyMDA0NCswMCcwMCcp Ci9Nb2REYXRlIChEOjIwMTMwODIzMDIwMDQ0KzAwJzAwJykKPj4KZW5kb2JqCjYgMCBvYmoKPDwg L1R5cGUgL1BhZ2UKL1BhcmVudCAzIDAgUgovQW5ub3RzIFsgMTAgMCBSIDEzIDAgUiBdCi9Db250 ZW50cyA3IDAgUgo + PgplbmRvYmoKNyAwIG9iago8PCAvRmlsdGVyIC9GbGF0ZURlY29kZQovTGVu Z3RoIDI3OCA + PgpzdHJlYW0KeJyFkb1Ow0AQhHs / xZRQsNm9 / 2tRAnJEA1wXpUBJSIOFIAWvz9ox FwMKyNLJmtuZb3evYWJmTM / 3fXNdYJIljhbRGnIxoWwxuzEQT4zyDKw uSlvuFpdrlCUWpfmd83Cr YvT4AGOJFbDWn21Tg00mYYsO1iTKJlXlBY / fnYaMH90uE0tAZNVSVrMPhnJyVfnL3NcGzkNtCG50

---

根据部分消息（ ontent-Type: ... ），我猜测输出缓冲区已经被填满并被自动刷新，只有刷新后的输出才会被分配给$message 。

还有两个额外的空白行--PHP-mixed-<?php echo $random_hash; ?> --PHP-mixed-<?php echo $random_hash; ?>和Content-Type: application/octet-stream; ... Content-Type: application/octet-stream; ...可能会导致麻烦。

依靠输出缓冲来构造一个字符串既容易出错又完全不必要。 使用PHP的HEREDOC语法取而代之要好得多：

  $message = <<<MSG
--PHP-mixed-$random_hash
Content-Type: multipart/alternative; boundary="PHP-alt-$random_hash"

--PHP-alt-$random_hash
Content-Type: text/html; charset="iso-8859-1"
Content-Transfer-Encoding: 7bit

$message<br /><br />


--PHP-alt-$random_hash--

--PHP-mixed-$random_hash
Content-Type: application/octet-stream; name="$filename"
Content-Transfer-Encoding: base64
Content-Disposition: attachment; filename="$filename"

$attachment;
--PHP-mixed-$random_hash--

MSG;

$mail_sent = @mail( $to, $subject, $message, $headers );

请注意，邮件中的行尾必须是CRLF（例如 r n）。 如果上述不起作用，则可能需要用显式行尾来构造一个字符串：

$message = "--PHP-mixed-$random_hashrn"
         . "Content-Type: multipart/alternative; boundary="PHP-alt-$random_hash"rn"
         . "rn"
         /* ... */
         . $attachment
         . "rn--PHP-mixed-$random_hash--"
         . "rn";

有关更多详细信息，请参阅PHP的mail（）手册页。

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