<?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 {
        $atcNAF = simplexml_load_file('http://api.vateud.net/online/atc/DA.xml');
        foreach ($atcNAF as $controller):
                $xploded = explode('_', $controller->callsign);
                if (strlen($xploded[0]) == 4){
                        if (in_array(end($xploded), array('DEL','GND','TWR', 'APP', 'DEP', 'CTR'), true)){
                          $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 "<table class=\"table table-hover\">
   <thead>
       <tr>
           <th>Name</th>
           <th>Frequency</th>
           <th>Position</th>
       </tr>
   </thead>
   <tbody>
   $tablerows
   </tbody>
</table>";
  }
  else {
    echo "<span>No controllers currently online!</span>";
  }
?>