laravel 分页

public function paginate($perPage = null, $pageName = 'page', $page = null)
    {
        $engine = $this->engine();

        $page = $page ?: Paginator::resolveCurrentPage($pageName);

        $perPage = $perPage ?: $this->model->getPerPage();

        $results = Collection::make($engine->map(
            $rawResults = $engine->paginate($this, $perPage, $page), $this->model
        ));

        $paginator = (new LengthAwarePaginator($results, $engine->getTotalCount($rawResults), $perPage, $page, [
            'path' => Paginator::resolveCurrentPath(),
            'pageName' => $pageName,
        ]));

        return $paginator->appends('query', $this->query);
    }