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我似乎无法找到这个我写的php函数的问题,应该发送带附件的电子邮件.我已经挣扎了很长一段时间.

function myMail($to, $subject, $mail_msg, $filename, $contentType){

    $random_hash = md5(date('r', time()));
    $headers = "From: webmaster@example.com\r\nReply-To: ".$to;
    $headers .= "\r\nContent-Type: ".$contentType.
        "; boundary=\"PHP-mixed-".$random_hash."\"";

    $attachment = chunk_split(base64_encode(file_get_contents($filename)));
    ob_start();

    echo "
--PHP-mixed-$random_hash
Content-Type: multipart/alternative; boundary=\"PHP-alt-$random_hash\"

--PHP-alt-$random_hash
Content-Type: text/plain; charset=\"utf-8\"
Content-Transfer-Encoding: 7bit

$mail_msg

--PHP-alt-$random_hash

--PHP-mixed-$random_hash--
Content-Type: text/plain; name=\"$filename\" 
Content-Transfer-Encoding: base64 
Content-Disposition: attachment 

$attachment
--PHP-mixed-$random_hash--
";
    $message = ob_get_clean();
    $mail_sent = @mail( $to, $subject, $message, $headers );
    return $mail_sent ? "Mail sent" : "Mail failed";
}

编辑问题是邮件的消息与文件混合并作为附件发送.