public function save($data = null)
    {
        parent::save($data);

        // Invalidate configuration file from the opcache.
        if (\function_exists('opcache_invalidate')) {
            // PHP 5.5.5+
            @opcache_invalidate($this->filename, true);
        } elseif (\function_exists('apc_invalidate')) {
            // APC
            @apc_invalidate($this->filename);
        }
    }