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<?php
  $files = glob(cacheme_directory()."*");
  $now   = time();

  foreach ($files as $file) {
    if (is_file($file)) {
      if ($now - filemtime($file) >= 60 * 60 * 24 * 2) { // 2 days
        unlink($file);
      }
    }
  }
?>