[Script Error] Online Players

[epvp!]

<?php
include("conf.php");
mysql_connect($dbhost,$dbuser,$dbpass);
mysql_select_db("player");
$user = "SELECT COUNT(*) as count FROM player WHERE DATE_SUB(NOW(), INTERVAL 8 MINUTE) < last_play;";
$f = mysql_query($user,$sqlserver);
$player_on = mysql_fetch_object($f)->count;
echo $player_on;
?>