Capture NT user name

Hi,
I would like to capture the NT user name of the user who makes a comment in an intranet-based network [Windows 2003 server, with IIS]
I do have a snippet of code, found out recently, that works on its own.
However, being very new to php [with asp background] cannot get this to work.
I would like this snippet to be inserted after line 967, or near enough, in the ‘pluggable.php’ file; where it sends out an email to the moderator notifying him/her of a new comment. The snippet is:

—————–
‘
<?php
/*
Getting netbios info
CopyLeft 2002 (GNU GPL V2) by polo
*/

error_reporting(E_ALL);

/* get the ip of the client */
if (isset($_SERVER[“HTTP_X_FORWARDED_FOR”]))
{
$ip = $_SERVER[“HTTP_X_FORWARDED_FOR”];
} else {
$ip = $_SERVER[“REMOTE_ADDR”];
}
echo ‘ip : ‘.$ip.’
‘;

/* send a “special” packet */
$fp = fsockopen(‘udp://’.$ip, 137);
fwrite($fp, “\x80b\1 CKAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA!\1”);

/* wait 2 secs, and get the data */
socket_set_timeout($fp, 2);
$data = fread($fp, 256);

/* get netbios records number */
$nbrec = ord($data[56]);

/* display nebios records : the username is a record of type 3 */
echo ‘<table border=”1″>’;
echo ‘<tr><th>no</th><th>type</th><th>value</th></tr>’;
for($i = 0; $i < $nbrec; $i++) {
$offset = 18 * $i;
printf (“<tr><td>%02d</td><td>%02X</td><td>%s</td></tr>”,
$i,
ord($data[72 + $offset]),
trim(substr($data, 57 + $offset, 15)));
}
echo ‘</table>’;
?>
——————-‘

I would be grateful if someone who is a dab hand at php could modify the pluggable file and let me know.

Thank you.