Laravel 6 持久未定义变量错误

Question

当我尝试访问我认为的变量时，遇到未定义的变量错误。我在这里经历了几种解决方案，但没有一个对我有用。我已经彻底检查了可能导致 mu 代码中出现此错误的所有内容，但根本找不到任何内容，请协助控制器namespace App\Http\Controllers;use Illuminate\Http\Request;use App\Product;use App\Category;use App\Depot;use Illuminate\Support\Facades\DB;use Gloudemans\Shoppingcart\Facades\Cart;use Auth;class CheckoutController extends Controller{    public function index()    {        $allcategories=Category::get();        $delivery_method = DB::table('deliverymethods')            ->get();        $cartItems=Cart::content();        return view('checkout.index',['delivery_method'=>$delivery_method],['allcategories'=>$allcategories]);    }    public function deliverymethod()    {        $cartItems=Cart::content();        $allcategories=Category::get();        return view('delivery.index',['cartItems'=>$cartItems],['allcategories'=>$allcategories]);    }    public function billinginfo()    {        $depots=Depot::get();        $cartItems=Cart::content();        $allcategories=Category::get();        return view('billing.index',compact('cartItems'),['allcategories'=>$allcategories],['depots'=>$depots]);    }    public function shipping(Request $request)    {        $user_id=Auth::user()->id;        $shippingaddress=DB::table('shippingaddresses')                        ->select('shippingaddresses.*')                        ->where('user_id',$user_id)                        ->get();        $cartItems=Cart::content();        $allcategories=Category::get();        return view('shipping.index',['cartItems'=>$cartItems],['allcategories'=>$allcategories],['shippingaddress'=>$shippingaddress]);    }}

Answer 1

尝试将多个集合分组到一个数组中，然后将其发送到视图，如下所示：

$viewData = [

    'cartItems'  => $cartItems,

    'allcategories'   => $allcategories,

    'shippingaddress' => $shippingaddress

];

return View::make('shipping.index')->with($viewData);