public function set($key, $value)
    {
        $array = &$this->data;
        $keys = explode(self::SEPERATOR, $key);
        $i = 1;
        foreach ($keys as $item) {
            if (is_array($array) && array_key_exists($item, $array) && !is_array($array[$item]) && $i !== count($keys)) {
                return false;
            }
            $array = &$array[$item];
            $i++;
        }
        $array = $value;
        $this->save();
        return true;
    }