simple swtor server status (incl. controller boilerplate)

status.php

<?php

class ServerStatus
{
  private $cachePath = './status.cache';
  private $cacheLifetime = 60; // in sekunden
  private $statusUrl = 'http://www.swtor.com/de/server-status';

  public function dispatch($url)
  {
    return $this->getStatus($url);
  }

  public function getStatus($serverName) 
  {
    $serverName = str_replace('_', ' ', $serverName);
    $status = $this->lookup($serverName);
    return json_encode($status);
  }

  private function lookup($sn) 
  {
    $nfo = stat($this->cachePath);
    if($nfo['mtime']+$this->cacheLifetime < time()) {
      // refresh cache
      $data = $this->updateCache();
    } else {
      $data = $this->readCache();
    }
    return $data[$sn];
  }

  private function readCache() 
  {
    return json_decode(file_get_contents($this->cachePath), true);
  }

  private function updateCache()
  {
    $content = file_get_contents($this->statusUrl);
    $regExp = '/data-status="(?<status>UP|DOWN)" data-name="(?P<name>[^"]+)" data-population="(?P<population>\d+)" data-type="(?P<type>[PVvER-]+)" ((data-timezone="(?P<timezone>Ost|West)")|(data-language="(?P<language>[^"]+)"))/';
    preg_match_all($regExp, $content, $groups, PREG_SET_ORDER);
    $server = array();
    foreach($groups as $group) {
      $server[$group['name']] = array(
        'status'     => $group['status'],
        'name'       => $group['name'],
        'population' => $group['population'],
        'type'       => $group['type'],
        'timezone'   => isset($group['timezone']) ? $group['timezone'] : '',
        'language'   => isset($group['language']) ? $group['language'] : ''
      );
    }
    file_put_contents($this->cachePath, json_encode($server));
    return $server;
  }
}