paginate分页及手动分页

//ORM  默认分页
 $students=Student::paginate(5);
//显示
$students->render();

// 使用简单模板 - 只有 "上一页" 或 "下一页" 链接
Student::where(‘cars‘, 2)->simplePaginate(15);

// 手动分页
$item  //手动查询到的数据  
$total //所有符合条件的数据总数量  
$perPage      //每个页面，数据显示的条数
Paginator::make($items, $totalItems, $perPage);

//控制器代码    
    use Illuminate\Support\Facades\DB;
    use Illuminate\Pagination\LengthAwarePaginator;

    class IndexController extends Controller
    {
        //测试查询数据库并手动创建分页器
        public function paginationTest(Request $request){
            $perPage = 5;
            $page = $request->input("page",1)-1;
            $total = DB::table("person")
                        ->groupBy()
                        ->count();
    
            $items = DB::table("person")
                        ->groupBy()
                        ->skip($page*$perPage)
                        ->take($perPage)
                        ->get();
            
            //$items = array_slice($users, ($current_page-1)*$perPage, $perPage);
            //5.4版本
            $person = new LengthAwarePaginator($items, $total,$perPage);
            //设置baseUrl的方法
            $person->withPath("pagTest");
            //5.4版本之前
             $paginator =new LengthAwarePaginator($items, $total, $perPage, $currentPage, [
            ‘path‘ => Paginator::resolveCurrentPath(), 
            ‘pageName‘ => ‘page‘,
            ]);
    
            return view("index.paginationTest",[‘person‘ => $person]);
        }
    }

//blade
        普通分页
{！！{ $paginator->render() }！！}
    携带查询条件
{!! $paginator->appends(request()->input())->render() !!}    

        LengthAwarePaginator构造函数，代码如下
    /**
     * Create a new paginator instance.
     *
     * @param  mixed $items
     * @param  int $total
     * @param  int $perPage
     * @param  int|null $currentPage
     * @param  array $options (path, query, fragment, pageName)
     * @return void
     */
    publicfunction __construct($items,$total,$perPage,$currentPage=null,array$options= [])
    {
        foreach ($optionsas$key=>$value) {
            $this->{$key} =$value;
        }
    
        $this->total=$total;
        $this->perPage=$perPage;
        $this->lastPage= (int)ceil($total/$perPage);
        $this->path=$this->path!=‘/‘?rtrim($this->path,‘/‘) :$this->path;
        $this->currentPage=$this->setCurrentPage($currentPage,$this->pageName);
        $this->items=$itemsinstanceofCollection ?$items: Collection::make($items);
    }