问Laravel 8控制器返回前环误差

EN

 public function index(Request $request): JsonResponse

{
    $user = Auth()->user();
    $cart = Cart::where('user_id', $user->id)->with('items')->first();

    $fabric_items = json_decode($cart->items,true);

    // dd(gettype($cart->items));
    foreach($fabric_items as $key => $item)
    {
        $sku = explode("-",$item['product_data']['Fabric']);
        $product_image = Products::where('sku','like','%'.$sku[0].'%')->get();
        $fabric_items[$key]['image_url'] = $product_image[0]->image_url;
    }

    $cart->items = json_encode($fabric_items);

    if (!$cart) {
        return $this->returnError(__('You don\'t have any item in the cart'));
    }
    return response()->json(['status' => true, 'data' => $cart]);
}