只是为了好玩，我以为我会把它搞砸。最终变得比我想象的要复杂，因为我没有完全了解边界部分的工作原理，最终我发现起点和终点“-”很重要，然后就消失了。
<?PHP
if(isset($_POST['submit']))
{
//The form has been submitted, prep a nice thank you message
$output = '<h1>Thanks for your file and message!</h1>';
//Set the form flag to no display (cheap way!)
$flags = 'style="display:none;"';
//Deal with the email
$to = 'me@example.com';
$subject = 'a file for you';
$message = strip_tags($_POST['message']);
$attachment = chunk_split(base64_encode(file_get_contents($_FILES['file']['tmp_name'])));
$filename = $_FILES['file']['name'];
$boundary =md5(date('r', time()));
$headers = "From: webmaster@example.com\r\nReply-To: webmaster@example.com";
$headers .= "\r\nMIME-Version: 1.0\r\nContent-Type: multipart/mixed; boundary=\"_1_$boundary\"";
$message="This is a multi-part message in MIME format.
--_1_$boundary
Content-Type: multipart/alternative; boundary=\"_2_$boundary\"
--_2_$boundary
Content-Type: text/plain; charset=\"iso-8859-1\"
Content-@R_784_301@: 7bit
$message
--_2_$boundary--
--_1_$boundary
Content-Type: application/octet-stream; name=\"$filename\"
Content-@R_784_301@: base64
Content-Disposition: attachment
$attachment
--_1_$boundary--";
mail($to, $subject, $message, $headers);
}
?>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<Meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>MailFile</title>
</head>
<body>
<?PHP echo $output; ?>
<form enctype="multipart/form-data" action="<?PHP echo $_SERVER['PHP_SELF'];?>" method="post" <?PHP echo $flags;?>>
<p><label for="message">Message</label> <textarea name="message" id="message" cols="20" rows="8"></textarea></p>
<p><label for="file">File</label> <input type="file" name="file" id="file"></p>
<p><input type="submit" name="submit" id="submit" value="send"></p>
</form>
</body>
</html>
真的很准，而且显然使用内联CSS隐藏表单有点便宜，您几乎可以肯定希望向用户提供更多反馈！此外，我可能会花更多的时间来确定文件的实际Content-Type，而不是欺骗和使用application / octet-stream，但是那部分还是很有趣的。
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