public function set($key, $value)
{
return Sumo\Cache::set($key, $value);
$this->delete($key);
$file = DIR_CACHE . 'cache.' . preg_replace('/[^A-Z0-9\\._-]/i', '', $key) . '.' . (time() + $this->expire);
$handle = fopen($file, 'w');
fwrite($handle, serialize($value));
fclose($handle);
}