无法在 laravel 5.6 控制器中创建请求对象

Question

控制器名称MyController

<?php

namespace App\Http\Controllers;

use Illuminate\Http\Request;

class MyController extends Controller
{
    /**
     * Display a listing of the resource.
     *
     * @return \Illuminate\Http\Response
     */
    public function index(){
        //
    }

    /**
     * Show the form for creating a new resource.
     *
     * @return \Illuminate\Http\Response
     */
    public function create(){
        //
    }

    /**
     * Store a newly created resource in storage.
     *
     * @param  \Illuminate\Http\Request  $request
     * @return \Illuminate\Http\Response
     */
    public function store(Request $request){
        //
        $request->session()->put('key', '123');
        $data = $request->session()->get('key');
        print_r($data);
    }

    /**
     * Display the specified resource.
     *
     * @param  int  $id
     * @return \Illuminate\Http\Response
     */
    public function show($id){
        //
    }

    /**
     * Show the form for editing the specified resource.
     *
     * @param  int  $id
     * @return \Illuminate\Http\Response
     */
    public function edit($id){
        //
    }

    /**
     * Update the specified resource in storage.
     *
     * @param  \Illuminate\Http\Request  $request
     * @param  int  $id
     * @return \Illuminate\Http\Response
     */
    public function update(Request $request, $id){
        //
    }

    /**
     * Remove the specified resource from storage.
     *
     * @param  int  $id
     * @return \Illuminate\Http\Response
     */
    public function destroy($id){
        //
    }
    public function contact(){
        return view('contact');
    }

    public function createSession(Request $request){
        //
        $request->session()->put('key', '123');
        $data = $request->session()->get('key');
        print_r($data);
    }
    public function viewSession_v1(Request $request){
        $data = $request->session()->get('key');
        print_r($data);
    }
    public function viewSession_v2(Request $request){
        $data = $request->session()->get('key');
        print_r($data);
    }
}

路线：

Route::get('createSession', 'MyController@createSession');
Route::get('viewSession-1', 'MyController@viewSession_v1');
Route::get('viewSession-2', 'MyController@viewSession_v2');

现在当我调用"createSession" 时，它将创建新会话，当我调用"viewSession-1" 或"viewSession-2" 时，它将显示会话值，但我想从viewSession_v2() 中删除Request $request，所以我执行了以下代码：

public function viewSession_v2(){
        $request = new \Illuminate\Http\Request();
        $data = $request->session()->get('key');
        print_r($data);
    }

现在当我打电话给"viewSession-2" 时，它会给我以下错误

请任何人告诉我如何在method/function? 中创建请求对象以及为什么它在这里给我一个错误？

Answer 1

您始终可以访问 request() 和 session() 助手：

public function viewSession_v2(){
      $data = request()->session()->get('key');
      print_r($data);
}

或

public function viewSession_v2(){
      $data = session()->get('key');
      print_r($data);
}

Answer 2

我们知道 Laravel 提供了web middleware 概念。我认为您应该使用删除会话请求。

Route::group(['middleware' => ['web']], function () {
    // your routes here
});

More Info

或者你可以把这个条件写成：

public function viewSession_v2(Request $request){
    if($request->hasSession()) {
            $data = $request->session()->get('key');
            print_r($data);
        }
}