“错误”：“array_merge（）：预期参数 1 是一个数组，给定 null”

Question

当我尝试创建新订单时，会出现此错误：

"error": "array_merge(): Expected parameter 1 to be an array, null given"

这里是我试图用它创建新订单的整个功能，我试了 20 次，它运行良好，但一段时间后它停止工作并出现上述错误

public function placeOrder()
    {
        $user_id = auth()->id();

        try {
            $cart = Cart::where('client_id', '=', $user_id)->first();

            $cartDetails = CartDetail::where('cart_id', '=', $cart->id)->get();
        }catch (Exception $e){
            return response()->json(["error" =>$e->getMessage()]);
        }

        try {
            foreach ($cartDetails as $cartDetail){
                $item = StoreItem::where('item_id', '=', $cartDetail->item_id)->first();
                $this->items_total += $cartDetail->quantity;
                $discountedPrice =  ($item->unit_price * $item->discount) / 100;
                $this->total_amount += $cartDetail->quantity * $discountedPrice;
            }
        }catch (Exception $e){
            return response()->json(["error" =>$e->getMessage()]);
        }

        if(count($cartDetails->toArray()) == 0){
            return response()->json(["warning" => "Please Add Cart Items"]);
        }

        $storeId = $cartDetails[0]->store_id;
        try {
            $store = Store::findOrFail($storeId);

            $address = Address::where('user_id', '=', $user_id)->where('is_default', '=', true)->first();
        }catch (Exception $e){
            return response()->json(["error" => $e->getMessage()]);
        }

        $delivery_charge = 2;

        $final_total = $this->total_amount + $delivery_charge;

        $address_id = $address->id;

        try {

            $data = [
                'items_total' => $this->items_total,
                'total_amount' => $this->total_amount,
                'is_paid' => false,
                'delivery_charge' => $delivery_charge,
                'shopper_earning' => $delivery_charge / 1.5,
                'final_total' => $final_total,
                'client_id' => $user_id,
                'store_id' => $store->id,
                'address_id' => $address_id,
                'currency_id' => $store->currency_id
            ];

            $createdOrder = Order::create($data);


            if ($createdOrder){
                foreach ($cartDetails as $cartDetail){
                    $cartDetail->delete();
                }
                event(new CartUpdated($cart->id, $user_id));
            }

            return response()->json(['success' => $createdOrder]);
        }catch (Exception $e){
            return response()->json(["error" =>$e->getMessage()]);
        }
    }

当我尝试调试它时，错误在Order::create($data);内

为什么会出现这个错误？

编辑：

调试控制台：

{
    "message": "array_merge(): Expected parameter 1 to be an array, null given",
    "exception": "ErrorException",
    "file": "/home/sohaib/Desktop/Final-Project/Discounts/vendor/laravel/framework/src/Illuminate/Broadcasting/BroadcastEvent.php",
    "line": 78,
    "trace": [
        {
            "function": "handleError",
            "class": "Illuminate\\Foundation\\Bootstrap\\HandleExceptions",
            "type": "->"
        },
        {
            "file": "/home/sohaib/Desktop/Final-Project/Discounts/vendor/laravel/framework/src/Illuminate/Broadcasting/BroadcastEvent.php",
            "line": 78,
            "function": "array_merge"
        },
        {
            "file": "/home/sohaib/Desktop/Final-Project/Discounts/vendor/laravel/framework/src/Illuminate/Broadcasting/BroadcastEvent.php",
            "line": 64,
            "function": "getPayloadFromEvent",
            "class": "Illuminate\\Broadcasting\\BroadcastEvent",
            "type": "->"
        },
        {
            "function": "handle",
            "class": "Illuminate\\Broadcasting\\BroadcastEvent",
            "type": "->"
        },
        {
            "file": "/home/sohaib/Desktop/Final-Project/Discounts/vendor/laravel/framework/src/Illuminate/Container/BoundMethod.php",
            "line": 33,
            "function": "call_user_func_array"
        },
        {
            "file": "/home/sohaib/Desktop/Final-Project/Discounts/vendor/laravel/framework/src/Illuminate/Container/Util.php",
            "line": 36,
            "function": "Illuminate\\Container\\{closure}",
            "class": "Illuminate\\Container\\BoundMethod",
            "type": "::"
        },
        {
            "file": "/home/sohaib/Desktop/Final-Project/Discounts/vendor/laravel/framework/src/Illuminate/Container/BoundMethod.php",
            "line": 91,
            "function": "unwrapIfClosure",
            "class": "Illuminate\\Container\\Util",
            "type": "::"
        },
        {
            "file": "/home/sohaib/Desktop/Final-Project/Discounts/vendor/laravel/framework/src/Illuminate/Container/BoundMethod.php",
            "line": 35,
            "function": "callBoundMethod",
            "class": "Illuminate\\Container\\BoundMethod",
            "type": "::"
        },
        {
            "file": "/home/sohaib/Desktop/Final-Project/Discounts/vendor/laravel/framework/src/Illuminate/Container/Container.php",
            "line": 592,
            "function": "call",
            "class": "Illuminate\\Container\\BoundMethod",
            "type": "::"
        },
        {
            "file": "/home/sohaib/Desktop/Final-Project/Discounts/vendor/laravel/framework/src/Illuminate/Bus/Dispatcher.php",
            "line": 94,
            "function": "call",
            "class": "Illuminate\\Container\\Container",
            "type": "->"
        },
        {
            "file": "/home/sohaib/Desktop/Final-Project/Discounts/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php",
            "line": 128,
            "function": "Illuminate\\Bus\\{closure}",
            "class": "Illuminate\\Bus\\Dispatcher",
            "type": "->"
        },
        {
            "file": "/home/sohaib/Desktop/Final-Project/Discounts/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php",
            "line": 103,
            "function": "Illuminate\\Pipeline\\{closure}",
            "class": "Illuminate\\Pipeline\\Pipeline",
            "type": "->"
        },
        {
            "file": "/home/sohaib/Desktop/Final-Project/Discounts/vendor/laravel/framework/src/Illuminate/Bus/Dispatcher.php",
            "line": 98,
            "function": "then",
            "class": "Illuminate\\Pipeline\\Pipeline",
            "type": "->"
        },
        {
            "file": "/home/sohaib/Desktop/Final-Project/Discounts/vendor/laravel/framework/src/Illuminate/Broadcasting/BroadcastManager.php",
            "line": 114,
            "function": "dispatchNow",
            "class": "Illuminate\\Bus\\Dispatcher",
            "type": "->"
        },
        {
            "file": "/home/sohaib/Desktop/Final-Project/Discounts/vendor/laravel/framework/src/Illuminate/Events/Dispatcher.php",
            "line": 289,
            "function": "queue",
            "class": "Illuminate\\Broadcasting\\BroadcastManager",
            "type": "->"
        },
        {
            "file": "/home/sohaib/Desktop/Final-Project/Discounts/vendor/laravel/framework/src/Illuminate/Events/Dispatcher.php",
            "line": 212,
            "function": "broadcastEvent",
            "class": "Illuminate\\Events\\Dispatcher",
            "type": "->"
        },
        {
            "file": "/home/sohaib/Desktop/Final-Project/Discounts/vendor/laravel/framework/src/Illuminate/Broadcasting/PendingBroadcast.php",
            "line": 57,
            "function": "dispatch",
            "class": "Illuminate\\Events\\Dispatcher",
            "type": "->"
        },
        {
            "file": "/home/sohaib/Desktop/Final-Project/Discounts/vendor/laravel/framework/src/Illuminate/Foundation/helpers.php",
            "line": 218,
            "function": "__destruct",
            "class": "Illuminate\\Broadcasting\\PendingBroadcast",
            "type": "->"
        },
        {
            "file": "/home/sohaib/Desktop/Final-Project/Discounts/app/Observers/OrderStatusObserver.php",
            "line": 15,
            "function": "broadcast"
        },
        {
            "function": "created",
            "class": "App\\Observers\\OrderStatusObserver",
            "type": "->"
        },
        {
            "file": "/home/sohaib/Desktop/Final-Project/Discounts/vendor/laravel/framework/src/Illuminate/Events/Dispatcher.php",
            "line": 388,
            "function": "call_user_func_array"
        },
        {
            "file": "/home/sohaib/Desktop/Final-Project/Discounts/vendor/laravel/framework/src/Illuminate/Events/Dispatcher.php",
            "line": 218,
            "function": "Illuminate\\Events\\{closure}",
            "class": "Illuminate\\Events\\Dispatcher",
            "type": "->"
        },
        {
            "file": "/home/sohaib/Desktop/Final-Project/Discounts/vendor/laravel/framework/src/Illuminate/Database/Eloquent/Concerns/HasEvents.php",
            "line": 188,
            "function": "dispatch",
            "class": "Illuminate\\Events\\Dispatcher",
            "type": "->"
        },
        {
            "file": "/home/sohaib/Desktop/Final-Project/Discounts/vendor/laravel/framework/src/Illuminate/Database/Eloquent/Model.php",
            "line": 886,
            "function": "fireModelEvent",
            "class": "Illuminate\\Database\\Eloquent\\Model",
            "type": "->"
        },
        {
            "file": "/home/sohaib/Desktop/Final-Project/Discounts/vendor/laravel/framework/src/Illuminate/Database/Eloquent/Model.php",
            "line": 728,
            "function": "performInsert",
            "class": "Illuminate\\Database\\Eloquent\\Model",
            "type": "->"
        },
        {
            "file": "/home/sohaib/Desktop/Final-Project/Discounts/vendor/laravel/framework/src/Illuminate/Database/Eloquent/Builder.php",
            "line": 767,
            "function": "save",
            "class": "Illuminate\\Database\\Eloquent\\Model",
            "type": "->"
        },
        {
            "file": "/home/sohaib/Desktop/Final-Project/Discounts/vendor/laravel/framework/src/Illuminate/Support/helpers.php",
            "line": 433,
            "function": "Illuminate\\Database\\Eloquent\\{closure}",
            "class": "Illuminate\\Database\\Eloquent\\Builder",
            "type": "->"
        },
        {
            "file": "/home/sohaib/Desktop/Final-Project/Discounts/vendor/laravel/framework/src/Illuminate/Database/Eloquent/Builder.php",
            "line": 768,
            "function": "tap"
        },
        {
            "file": "/home/sohaib/Desktop/Final-Project/Discounts/vendor/laravel/framework/src/Illuminate/Support/Traits/ForwardsCalls.php",
            "line": 23,
            "function": "create",
            "class": "Illuminate\\Database\\Eloquent\\Builder",
            "type": "->"
        },
        {
            "file": "/home/sohaib/Desktop/Final-Project/Discounts/vendor/laravel/framework/src/Illuminate/Database/Eloquent/Model.php",
            "line": 1728,
            "function": "forwardCallTo",
            "class": "Illuminate\\Database\\Eloquent\\Model",
            "type": "->"
        },
        {
            "file": "/home/sohaib/Desktop/Final-Project/Discounts/vendor/laravel/framework/src/Illuminate/Database/Eloquent/Model.php",
            "line": 1740,
            "function": "__call",
            "class": "Illuminate\\Database\\Eloquent\\Model",
            "type": "->"
        },
        {
            "file": "/home/sohaib/Desktop/Final-Project/Discounts/app/Http/Controllers/Api/OrderController.php",
            "line": 108,
            "function": "__callStatic",
            "class": "Illuminate\\Database\\Eloquent\\Model",
            "type": "::"
        },
        {
            "function": "placeOrder",
            "class": "App\\Http\\Controllers\\Api\\OrderController",
            "type": "->"
        },
        {
            "file": "/home/sohaib/Desktop/Final-Project/Discounts/vendor/laravel/framework/src/Illuminate/Routing/Controller.php",
            "line": 54,
            "function": "call_user_func_array"
        },
        {
            "file": "/home/sohaib/Desktop/Final-Project/Discounts/vendor/laravel/framework/src/Illuminate/Routing/ControllerDispatcher.php",
            "line": 45,
            "function": "callAction",
            "class": "Illuminate\\Routing\\Controller",
            "type": "->"
        },
        {
            "file": "/home/sohaib/Desktop/Final-Project/Discounts/vendor/laravel/framework/src/Illuminate/Routing/Route.php",
            "line": 239,
            "function": "dispatch",
            "class": "Illuminate\\Routing\\ControllerDispatcher",
            "type": "->"
        },

这大约是一半，但我认为已经足够了，所以我在一个名为 OrderStatusObserver 的类之前创建了一个，老实说，我不知道它是如何工作的，但是这个类包含以下代码：

<?php

namespace App\Observers;

use App\Events\OrderStatus;
use App\Order;

class OrderStatusObserver
{
    public function created(Order $order)
    {
       broadcast(new OrderStatus($order));
    }
}

这是我在 OrderStatus 事件中的 broadcastWith 函数：

public function broadcastWith()
    {
        if($this->order->status == 'accepted'){
            return ['current_position' => 2, 'id' => $this->order->id];
        }elseif ($this->order->status == 'inprogress'){
            return ['current_position' => 3];
        }elseif ($this->order->status == 'onway'){
            return ['current_position' => 4];
        }elseif ($this->order->status == 'delivered'){
            return ['current_position' => 5];
        }
    }

当我评论 broadcast(new OrderStatus($order)); 这条线时它工作正常，所以任何人都知道这是什么问题，希望任何人都可以帮助并为我的英语感到抱歉

Answer 1

我认为您在创建方法中使用了数组 _merge()。你能给我们看看这个吗？您还可以在将 $data 发送到您的方法之前检查它是否不为空。

只是为了解释为什么我要求您分享您的OrderStatus 课程： 根据您的错误跟踪，问题来自BroadcastEvent.php 中的函数getPayloadFromEvent：

protected function getPayloadFromEvent($event)
{
    if (method_exists($event, 'broadcastWith')) {
        return array_merge(
            $event->broadcastWith(), ['socket' => data_get($event, 'socket')]
        );
    }

    $payload = [];

    foreach ((new ReflectionClass($event))->getProperties(ReflectionProperty::IS_PUBLIC) as $property) {
        $payload[$property->getName()] = $this->formatProperty($property->getValue($event));
    }

    unset($payload['broadcastQueue']);

    return $payload;
}

就在 array_merge 调用中：

return array_merge($event->broadcastWith(), ['socket' => data_get($event, 'socket')]);

因此，正如您的错误消息所说 "array_merge(): Expected parameter 1 to be an array, null given"，在您的情况下，broadcastWith 返回的是 null 而不是数组。

Answer 2

问题是因为broadCastWith所以你应该在这个方法中返回一个数组。 你有两个问题。

1-in boradCastWith 你只检查status 的值，并且没有后备代码。所以在这种情况下，如果您的状态不是delivered,onway,inprogress,accepted 之一，您就有问题了

public function broadcastWith()
{
    if($this->order->status == 'accepted'){
        return ['current_position' => 2, 'id' => $this->order->id];
    }elseif ($this->order->status == 'inprogress'){
        return ['current_position' => 3];
    }elseif ($this->order->status == 'onway'){
        return ['current_position' => 4];
    }elseif ($this->order->status == 'delivered'){
        return ['current_position' => 5];
    }

    return []; // this is a important line
}

另外请注意，您可以使用 switch case 而不是 elseif

2-您处理这 4 种状态可能是因为其他类型的状态无效。所以你应该添加验证。 同样在您的代码中，您没有任何状态值，因此您应该为其添加默认值。看https://stackoverflow.com/a/39912500/1827594

Answer 3

就我而言，我的活动中有一个broadcastWith 方法。 在这里面我有一个像这样的广播值：

return 'say hello to world!';

由于此消息，Laravel 为 array_marge 返回错误。

当我把它改成这个时：

return ['say hello to world!'];

它有效，但我以数组格式收到消息。

我改成这样了：

return ['message' => 'say hello to world'];

现在我收到json 格式的这样的消息：

{message:say hello to world}