public function getFilePath($name, $extension = '.php')
    {
        $filename = trim(dotToPath($name), '/') . $extension;
        $file = null;
        foreach ($this->paths as $dir) {
            $realName = nPath($dir, $filename);
            if (file_exists($realName)) {
                $file = $realName;
                break;
            }
        }
        return $file;
    }