Smid ip ind i database

<?
include("inc/sql.php");

$IP = $REMOTE_ADDR; 

$FIP = $GLOBALS['HTTP_X_FORWARDED_FOR']; 

if (($FIP != "") && ($FIP != "unknown")) $IP = $FIP; 

$IP = explode(",", $IP); 

$time=time();
$select_chatten = mysql_query("SELECT id FROM users WHERE(username='Chatten')");
$row_chatten = mysql_fetch_array($select_chatten);

$select_chattere = mysql_query("SELECT id,username,rum,answer FROM users WHERE(rum!=0)");
while($row_chattere=mysql_fetch_array($select_chattere)) {
if ($time-$row_chattere[answer] > 180)
{
mysql_query("INSERT INTO chat (rum,text,time,f,t) VALUES('$row_chattere[rum]','$row_chattere[username] blev smidt ud på grund af inaktivitet.','$time','$row_chatten[id]','0')");
mysql_query("UPDATE users SET rum='0',onlinechat='0',ip= '$IP[0]' WHERE(id='$row_chattere[id]')");
}



hvorfor opdaterer den ik min ip inde i databasen ?