laravel 5.4中手动创建分页

这里是参考的的链接https://blog.csdn.net/hxx_yang/article/details/51753134

use IlluminatePaginationLengthAwarePaginator;
use IlluminatePaginationPaginator;

public function index(Request $request)
    {
        ## 获取数据
        $menus=DB::table('sys_menu')->get();
//        $menusPage=DB::table('sys_menu')->paginate(10);

        $sysMenu = new SysMenu();
        $menusTree = $sysMenu->getTreeMenu($menus, $p_id = 0, $level = 0);
        
        $perPage = 10;
        if ($request->has('page')) {
            $current_page = $request->input('page');
            $current_page = $current_page <= 0 ? 1 :$current_page;
        } else {
            $current_page = 1;
        }

        $item = array_slice($menusTree, ($current_page-1)*$perPage, $perPage); //注释1
        $total = count($menusTree);

        $paginator =new LengthAwarePaginator($item, $total, $perPage, $current_page, [
            'path' => Paginator::resolveCurrentPath(),  //注释2
            'pageName' => 'page',
        ]);

        $menuslist = $paginator->toArray()['data'];

        return view('menu.index', compact('menuslist', 'paginator'));

    }
这里是核心代码
主要是因为对数据取出的数据进行了二次处理 或者是 groupby出来的数据 进行分页
blade模板的页面

@foreach ($menuslist as $menu)
                <tr>
                    <td class="text-center">
                        <input type="checkbox" name="selected[]" value="{{$menu->id}}"/>
                    </td>
                    <td class="text-left">
                        @if($menu->level == 1)
                            &nbsp;&nbsp;&nbsp;&nbsp;
                        @elseif($menu->level == 2)
                            &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
                        @elseif($menu->level == 3)
                            &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
                        @endif
                        {{$menu->name}}</td>
                    <td class="text-left">{{$menu->name_path}}</td>
                    <td class="text-left">{{$menu->href}}</td>
                    <td class="text-left">{{$menu->remarks}}</td>

                    <td class="text-right">
                        <a href="/menu/edit?id={{$menu->id}}" data-toggle="tooltip" title="编辑"
                           class="btn btn-primary">编辑
                        </a>
                    </td>
                </tr>
            @endforeach
            </tbody>
        </table>
    </div>
</form>
<div class="pagers ">
    {!! $paginator->render() !!}
</div>