PHP - 发送带附件的电子邮件不显示邮件内容

Question

尝试创建一个脚本，我可以在其中发送带附件的电子邮件。一切正常，除了当我不在电子邮件中添加文件时，我仍然可以看到带有 0B 且没有名称的附件。

if(isset($_POST["my_send"])){


    $email_to = $_POST['my_email_to']; //required

    $email_from = "myemail@example.co.uk"; // required

    $subject = $_POST['my_subject']; // not required

    $comments = $_POST['write_my_email']; // required

    $email_message .= stripcslashes("$comments");

    $attachment = chunk_split(base64_encode(file_get_contents($_FILES['file']['tmp_name'])));
    $filename = $_FILES['file']['name'];

// create email headers

$headers = 'From: '.$email_from."\r\n".
$headers .= "MIME-Version: 1.0\r\n";
$headers .= "Content-Type: multipart/mixed; boundary=\"_1_$boundary\"\r\n";

'Reply-To: '.$email_from."\r\n" .

'X-Mailer: PHP/' . phpversion();

$message="This is a multi-part message in MIME format.

--_1_$boundary
Content-Type: multipart/alternative; boundary=\"_2_$boundary\"

--_2_$boundary
Content-Type: text/plain; charset=\"iso-8859-1\"
Content-Transfer-Encoding: 7bit

$email_message

--_2_$boundary--
--_1_$boundary
Content-Type: application/octet-stream; name=\"$filename\" 
Content-Transfer-Encoding: base64 
Content-Disposition: attachment 

$attachment
--_1_$boundary--";


mail($email_to, $subject, $message, $headers);  


        echo "<h5>Thanks, your email was sent successfully!</h5>";

}

我做错了什么？有什么建议吗？

Answer 1

没有附件就排除这个:

--_1_$boundary
Content-Type: application/octet-stream; name=\"$filename\" 
Content-Transfer-Encoding: base64 
Content-Disposition: attachment 

$attachment
--_1_$boundary--

例如，仅在文件名不为空时将其附加到$message:

$message = "This is a multi-part message in MIME format.
    --_1_$boundary
    Content-Type: multipart/alternative; boundary=\"_2_$boundary\"

    --_2_$boundary
    Content-Type: text/plain; charset=\"iso-8859-1\"
    Content-Transfer-Encoding: 7bit

    $email_message";

if (!empty($filename))
{
   $message .= " --_1_$boundary
        Content-Type: application/octet-stream; name=\"$filename\" 
        Content-Transfer-Encoding: base64 
        Content-Disposition: attachment 

        $attachment
        --_1_$boundary--";
}