ระบบไม่เช็ค ip address เครื่องเมื่อเอาขึ้น server จริง

<?
@mysql_connect($conn_sv,$conn_user,$conn_pw)or die("Cannot connect to database");
@mysql_select_db($conn_db)or die("Cannot select database");
@mysql_db_query($conn_db,"set names utf8"); 
$ip=$_SERVER['REMOTE_ADDR'];
$sql = "select ip_thispc, detail_bu  from `numbu` where ip_thispc='$ip'";  
$rs = mysql_query($sql) or die("Cannot query");

$rt = mysql_fetch_array($rs);
	if ($_SERVER['REMOTE_ADDR'] == $rt["ip_thispc"]){
		echo "data_id=".$rt["detail_bu"]; 
		}
	else {
			echo "data_id="."Please Select Building";
			}
?>