ACCNAF online php

<?php
  echo "<!--Code by Joseph Donat Bolton 1289478-->";
 $cache_file = 'atctable.cache';
  if (file_exists($cache_file) && (filemtime($cache_file) > (time() - 60 * 2 ))) {
    $tablerows = file_get_contents($cache_file);
  }
  else {
        $atcNAF = simplexml_load_file('http://api.vateud.net/online/atc/GM,GS,GQ,GO,GB,GV,GU,GL,GF,GG,DA,DT,GA,DF,DI,DG,DX,DB,DN,DR,HL,FT,HS,HA,HH,HD,HC,HK,FS.xml');
        foreach ($atcNAF as $controller):
                $xploded = explode('_', $controller->callsign);
                if (strlen($xploded[0]) == 4){
                        if (in_array(end($xploded), array('DEL','GND','TWR', 'APP', 'DEP', 'CTR', 'FSS'), true) && $xploded[0] !== 'GULF'){
                          $name = $controller->name;
                          $frequency = $controller->frequency;
                          $callsign = $controller->callsign;
                          $row = "<tr> <td>$name</td> <td>$frequency MHz</td> <td>$callsign</td></tr>";
                          $tablerows .= $row;
                        }
                }
        endforeach;
  file_put_contents($cache_file, $tablerows, LOCK_EX);
}
if (!empty($tablerows)) {
  echo "                        <div class=\"panel margin-bottom-40\">
  <table class=\"table table-hover\">
    <thead>
        <tr>
            <th>Name</th>
            <th>Frequency</th>
            <th>Position</th>
        </tr>
    </thead>
    <tbody>
    $tablerows
    </tbody>
</table>
</div>
";
  }
  else {
    echo "<div class=\"row\">
                <div class=\"col-md-9 animated fadeInLeft\"><span>No controllers currently online!</span></div></div>";
  }
?>