Theme Upload Failed fsockopen

hey,
i recently tried to upload my theme to ww.wp.xz.cn and ran into an error:

WARNING: fsockopen was found in the file status.php File operations should use the WP_Filesystem methods instead of direct PHP filesystem calls.

the file status.php is a script for checking the online status of a gameserver.
what should i do now?

here is the status.php:

<?php
  $server = "255.255.255.255";
  $port = "25565";
  $timeout = "10";
  if ($server and $port and $timeout)
  {
  $minecraft = @fsockopen("$server", $port, $timeout);
  }
  if($minecraft)
  {
  echo '<div class="online"/>';
  }
  else
  {
  echo '<div class="offline"/>';
  }
  ?>