PHP:使用带附件的邮件()给出.dat文件

<?php
$to = 'recipient@example.com'; // 收件人邮箱地址
$subject = '邮件主题'; // 邮件主题
$message = '邮件正文'; // 邮件正文

// 构建邮件头部信息
$headers = "From: sender@example.com\r\n";
$headers .= "MIME-Version: 1.0\r\n";
$headers .= "Content-Type: multipart/mixed; boundary=\"boundary\"\r\n";

// 构建邮件内容
$body = "--boundary\r\n";
$body .= "Content-Type: text/plain; charset=\"utf-8\"\r\n";
$body .= "Content-Transfer-Encoding: 7bit\r\n\r\n";
$body .= $message."\r\n";

// 读取附件文件内容
$attachment = file_get_contents('path/to/attachment.dat');

// 添加附件
$body .= "--boundary\r\n";
$body .= "Content-Type: application/octet-stream\r\n";
$body .= "Content-Transfer-Encoding: base64\r\n";
$body .= "Content-Disposition: attachment; filename=\"attachment.dat\"\r\n\r\n";
$body .= chunk_split(base64_encode($attachment))."\r\n";

$body .= "--boundary--";

// 发送邮件
if (mail($to, $subject, $body, $headers)) {
    echo "邮件发送成功";
} else {
    echo "邮件发送失败";
}
?>