$locid = $_GET['locid'];

$info_user = mysql_fetch_array(mysql_query("SELECT * FROM `users` WHERE id='$id'"));
$row = mysql_fetch_array(mysql_query("SELECT * FROM `location2` WHERE id='{$info_user['location']}'"));
$go_array = $row['array_go'];
$arr = array($row['id']=>array($go_array));
if(in_array($locid, $arr[$info_user['location']])){
      update('users',array('location'=>$locid),'id='.(int)$id);
      header("Location: game.php?fun=m_loc&map=1");
}else{
      echo '<script>alert("Нельзя попасть в локацию!");location.href="game.php?fun=m_loc&map=1"</script>';
}