要发送带有附件的电子邮件，我们需要使用multipart / mixed MIME类型，该类型指定混合类型将包含在电子邮件中。此外，我们想使用多部分/替代MIME类型来发送电子邮件的纯文本和HTML版本，请看示例：
<?PHP
//define the receiver of the email
$to = 'youraddress@example.com';
//define the subject of the email
$subject = 'Test email with attachment';
//create a boundary string. It must be unique
//so we use the MD5 algorithm to generate a random hash
$random_hash = md5(date('r', time()));
//define the headers we want passed. Note that they are separated with \r\n
$headers = "From: webmaster@example.com\r\nReply-To: webmaster@example.com";
//add boundary string and mime type specification
$headers .= "\r\nContent-Type: multipart/mixed; boundary=\"PHP-mixed-".$random_hash."\"";
//read the atachment file contents into a string,
//encode it with MIME base64,
//and split it into smaller chunks
$attachment = chunk_split(base64_encode(file_get_contents('attachment.zip')));
//define the body of the message.
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/plain; charset="iso-8859-1"
Content-@R_230_301@: 7bit
Hello World!!!
This is simple text email message.
--PHP-alt-<?PHP echo $random_hash; ?>
Content-Type: text/html; charset="iso-8859-1"
Content-@R_230_301@: 7bit
<h2>Hello World!</h2>
<p>This is something with <b>HTML</b> formatting.</p>
--PHP-alt-<?PHP echo $random_hash; ?>--
--PHP-mixed-<?PHP echo $random_hash; ?>
Content-Type: application/zip; name="attachment.zip"
Content-@R_230_301@: base64
Content-Disposition: attachment
<?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 );
//if the message is sent successfully print "Mail sent". Otherwise print "Mail Failed"
echo $mail_sent ? "Mail sent" : "Mail Failed";
?>
如您所见，发送带有附件的电子邮件很容易完成。在前面的示例中，我们具有multipart / mixed MIME类型，在其中，我们具有multipart / alternative MIME类型，用于指定电子邮件的两个版本。为了包括消息的附件，我们将指定文件中的数据读取为字符串，使用base64对其进行编码，将其拆分成较小的块以确保其与MIME规范匹配，然后将其作为附件包含在内。
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