Sending email with attachments

$to = ;
 $from    =  ;
 $subject = ;
 $message = ;
 
 $headers = "From: $from";
 
 // Generate a boundary string
 $semi_rand = md5(time());
 $mime_boundary = "==Multipart_Boundary_x{$semi_rand}x";
 
 // Add the headers for a file attachment
 $headers .= "\nMIME-Version: 1.0\n" .
             "Content-Type: multipart/mixed;\n" .
             " boundary=\"{$mime_boundary}\"";
 
 // Add a multipart boundary above the plain message
 $message = "This is a multi-part message in MIME format.\n\n" .
            "--{$mime_boundary}\n" .
            "Content-Type: text/plain; charset=\"iso-8859-1\"\n" .
            "Content-Transfer-Encoding: 7bit\n\n" .
            $message . "\n\n";
 
$data = $output ;
 
// Base64 encode the file data
$data = chunk_split(base64_encode($data));
 
 // Add file attachment to the message
 $message .= "--{$mime_boundary}\n" .
             "Content-Type: xml;\n" .
             " name=\"segala.rdf\"\n" .
             "Content-Disposition: attachment;\n" .
             " filename=\"segala.rdf\"\n" .
             "Content-Transfer-Encoding: base64\n\n" .
             $data . "\n\n" .
             "--{$mime_boundary}--\n";
 
 
$posted = @mail($to, $subject, $message, $headers);