php mail邮件发送带附件功能。

$pdfname="test.pdf";
$email="test@test.com";
$text = "您好，附件中是您需要的pdf文件。请点击下载。
www.111com.net";         //文本内容

$text = base64_encode($text);     //用base64方法把它编码
$text = chunk_split($text);     //把这个长字符串切成由每行76个字符组成的小块

$subject = $pdfname;         //标题
$from = "admin@111com.net";     //发送者
$to = $email;     //接受者

//附件
// 定义分界线
$boundary = "nextpart_".uniqid("");
$boundary2 = "nextpart_".uniqid("");
$headers = "to: $torn";
$headers .= "from: $fromrn";
$headers .="mime-version: 1.0rn";
$headers .= "content-type: multipart/mixed;
            boundary="----=_$boundary"rn";

$read=file_get_contents($pdfname);

$read = base64_encode($read);     //用base64方法把它编码
$read = chunk_split($read);     //把这个长字符串切成由每行76个字符组成的小块

//现在我们可以建立邮件的主体
$body = "this is a multi-part message in mime format.

------=_$boundary
content-type: multipart/alternative;
    boundary="----=_$boundary2";

------=_$boundary2
content-type: text/html;
    charset="gbk"
content-transfer-encoding: base64

$text

------=_$boundary2--

------=_$boundary
content-type: application/octet-stream;
    charset="gbk";
    name="$pdfname"
content-disposition: attachment; filename="$pdfname"
content-transfer-encoding: base64

$read

-------=_$boundary--";

if(mail($to, $subject,$body,$headers))
   echo "您需要的pdf文件(".$pdfname.")已经发往您的邮箱：".$to."。
请查收。";
else
   echo "抱歉，发送失败了。
";