Laravel中Pusher触发报错：第一个参数需为对象或已存在类名

错误详情 #

调用Pusher->trigger方法时触发以下错误：

First parameter must either be an object or the name of an existing class

调用栈及错误追踪：

Pusher\Pusher->trigger(Array, 'App\\Events\\NewC...', Array, Array)

[2023-09-03 23:39:53] production.ERROR: First parameter must either be an object or the name of an existing class {"exception":"[object] (ErrorException(code: 0): First parameter must either be an object or the name of an existing class at /var/www/wooloveapp.com/vendor/pusher/pusher-php-server/src/Pusher.php:538)
[stacktrace]
#0 [internal function]: Illuminate\Foundation\Bootstrap\HandleExceptions->handleError(2, 'First parameter...', '/var/www/woolov...', 538, Array)
#1 /var/www/wooloveapp.com/vendor/pusher/pusher-php-server/src/Pusher.php(538): property_exists(NULL, 'channels')
#2 /var/www/wooloveapp.com/vendor/laravel/framework/src/Illuminate/Broadcasting/Broadcasters/PusherBroadcaster.php(125): Pusher\Pusher->trigger(Array, 'App\\Events\\NewC...', Array, Array)
#3 /var/www/wooloveapp.com/vendor/laravel/framework/src/Illuminate/Broadcasting/BroadcastEvent.php(77): Illuminate\Broadcasting\Broadcasters\PusherBroadcaster->broadcast(Array, 'App\\Events\\NewC...', Array)
#4 /var/www/wooloveapp.com/vendor/laravel/framework/src/Illuminate/Container/BoundMethod.php(36): Illuminate\Broadcasting\BroadcastEvent->handle(Object(Illuminate\Broadcasting\BroadcastManager))
#5 /var/www/wooloveapp.com/vendor/laravel/framework/src/Illuminate/Container/Util.php(40): Illuminate\Container\BoundMethod::Illuminate\Container\{closure}()
#6 /var/www/wooloveapp.com/vendor/laravel/framework/src/Illuminate/Container/BoundMethod.php(93): Illuminate\Container\Util::unwrapIfClosure(Object(Closure))
#7 /var/www/wooloveapp.com/vendor/laravel/framework/src/Illuminate/Container/BoundMethod.php(37): Illuminate\Container\BoundMethod::callBoundMethod(Object(Illuminate\Foundation\Application), Array, Object(Closure))
#8 /var/www/wooloveapp.com/vendor/laravel/framework/src/Illuminate/Container/Container.php(653): Illuminate\Container\BoundMethod::call(Object(Illuminate\Foundation\Application), Array, Array, NULL)
#9 /var/www/wooloveapp.com/vendor/laravel/framework/src/Illuminate/Bus/Dispatcher.php(128): Illuminate\Container\Container->call(Array)
#10 /var/www/wooloveapp.com/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(128): Illuminate\Bus\Dispatcher->Illuminate\Bus\{closure}(Object(Illuminate\Broadcasting\BroadcastEvent))
#11 /var/www/wooloveapp.com/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(103): Illuminate\Pipeline\Pipeline->Illuminate\Pipeline\{closure}(Object(Illuminate\Broadcasting\BroadcastEvent))
#12 /var/www/wooloveapp.com/vendor/laravel/framework/src/Illuminate/Bus/Dispatcher.php(132): Illuminate\Pipeline\Pipeline->then(Object(Closure))
#13 /var/www/wooloveapp.com/vendor/laravel/framework/src/Illuminate/Broadcasting/BroadcastManager.php(119): Illuminate\Bus\Dispatcher->dispatchNow(Object(Illuminate\Broadcasting\BroadcastEvent))
#14 /var/www/wooloveapp.com/vendor/laravel/framework/src/Illuminate/Events/Dispatcher.php(320): Illuminate\Broadcasting\BroadcastManager->queue(Object(App\Events\NewChatEvent))
#15 /var/www/wooloveapp.com/vendor/laravel/framework/src/Illuminate/Events/Dispatcher.php(243): Illuminate\Events\Dispatcher->broadcastEvent(Object(App\Events\NewChatEvent))
#16 /var/www/wooloveapp.com/vendor/laravel/framework/src/Illuminate/Broadcasting/PendingBroadcast.php(72): Illuminate\Events\Dispatcher->dispatch('App\\Events\\NewC...')
#17 /var/www/wooloveapp.com/vendor/laravel/framework/src/Illuminate/Foundation/helpers.php(218): Illuminate\Broadcasting\PendingBroadcast->__destruct()
#18 /var/www/wooloveapp.com/app/Notifications/NewChatNotif.php(57): broadcast(Object(App\Events\NewChatEvent))
#19 /var/www/wooloveapp.com/app/Notifications/NewChatNotif.php(29): App\Notifications\NewChatNotif->load()

问题根源 #

从调用栈可见，错误触发于Pusher.php第538行的property_exists(NULL, 'channels')，说明传递给trigger方法的第一个参数（频道相关数据）最终解析为NULL，不符合Pusher SDK的参数要求。

解决方案 #

• 检查事件类的broadcastOn方法：确保App\Events\NewChatEvent中的broadcastOn方法返回有效频道实例或字符串数组，示例：

  public function broadcastOn()
  {
      // 返回私有频道
      return new PrivateChannel('chat.' . $this->chat->id);
      // 或返回多个频道数组
      // return [new PrivateChannel('chat.'.$this->chat->id), 'public-channel'];
  }
  

  避免返回NULL、空数组，或依赖不存在的模型数据生成频道。

• 验证事件实例参数：在NewChatNotif.php中创建NewChatEvent实例时，确保传入的模型（如$chat）存在且有效，避免传递NULL值导致频道生成失败。

• 检查版本兼容性：确认Laravel版本与Pusher PHP SDK版本匹配，可通过composer show pusher/pusher-php-server查看版本，参考Laravel官方文档调整至兼容版本。

• 核对广播配置：确认.env文件中Pusher配置项正确：

  BROADCAST_DRIVER=pusher
  PUSHER_APP_ID=your-app-id
  PUSHER_APP_KEY=your-app-key
  PUSHER_APP_SECRET=your-app-secret
  PUSHER_APP_CLUSTER=your-cluster
  

内容的提问来源于stack exchange，提问作者gabogabans