Правильно ли я сделалл кеш?

class Cache {

  function fileTo($file, $time) {
    $filename = 'storage/cache/' . $file;
    if (file_exists($filename)) {
      if ((time() - $time) < filemtime($filename)) {
        return true;
      } else {
        return false;
      }
    } else {
      return false;
    }
  }

  function fileEcho($file) {
    $file = 'storage/cache/' . $file;
    return file_get_contents($file);
  }

  function fileNewCache($file, $data) {
    $file = 'storage/cache/' . $file;
    $fp = fopen($file, "w");
    flock ($fp,LOCK_EX);
    fwrite($fp, $data);
    flock ($fp,LOCK_UN);
    fclose($fp);
  }

  function fleDelete($file) {
    $file = 'storage/cache/' . $file;
    unlink($file);
  }

}