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if (!function_exists('checkdnsrr ')) {

  function checkdnsrr($host, $type) {

    if(!empty($host) && !empty($type)) {

      @exec('nslookup -type=' . escapeshellarg($type) . ' ' . escapeshellarg($host), $output);

      foreach ($output as $k => $line) {

        if(eregi('^' . $host, $line)) {

          return true;

        }

      }

    }

    return false;

  }

}