Mail函数发送附件

<?php

        $from = "xxx@qq.com";
        $to = "xxx@163.com";
        $subject = "标题";
        $subject = "=?UTF-8?B?".base64_encode($subject)."?=";
        $path = "附件路径";
        $attach_filename = "附件名";

        $emailBody =  "请查看附件";

# 然后我们要作为附件的HTML文件
        $attachment = file_get_contents($path);

        $boundary = uniqid("");

        $headers =  "From: $from
To: $to
Content-type: multipart/mixed; boundary=\"$boundary\"";

        $emailBody =  "--$boundary
Content-type: text/plain; charset=utf-8
Content-transfer-encoding: 8bit

$emailBody

--$boundary
Content-type: text/html; name=$attach_filename
Content-disposition: inline; filename=$attach_filename
Content-transfer-encoding: 8bit

$attachment

--$boundary--";

        mail("xxx@qq.com", $subject, $emailBody, $headers);