每天laravel-20160623|NullStore

<?phpnamespace Illuminate\Cache;use Illuminate\Contracts\Cache\Store;// a name space to declareclass NullStore extends TaggableStore implements Store{    use RetrievesMultipleKeys;// use a traits ,this is a Retrieves MultipleKeys    /**     * The array of stored values.     *     * @var array     */    protected $storage = [];// a store array to keep values.    /**     * Retrieve an item from the cache by key.     *     * @param  string  $key     * @return mixed     */    public function get($key)    {        //    }//  struct method    /**     * Store an item in the cache for a given number of minutes.     *     * @param  string  $key     * @param  mixed   $value     * @param  int     $minutes     * @return void     */    public function put($key, $value, $minutes)    {        //    }//struct method    /**     * Increment the value of an item in the cache.     *     * @param  string  $key     * @param  mixed   $value     * @return int     */    public function increment($key, $value = 1)    {        //    }//struct method    /**     * Increment the value of an item in the cache.     *     * @param  string  $key     * @param  mixed   $value     * @return int     */    public function decrement($key, $value = 1)    {        //    }//struct method    /**     * Store an item in the cache indefinitely.     *     * @param  string  $key     * @param  mixed   $value     * @return void     */    public function forever($key, $value)    {        //    }//struct method    /**     * Remove an item from the cache.     *     * @param  string  $key     * @return void     */    public function forget($key)    {        //    }//struct method    /**     * Remove all items from the cache.     *     * @return void     */    public function flush()    {        //    }//struct method    /**     * Get the cache key prefix.     *     * @return string     */    public function getPrefix()    {        return '';    }//struct method}