update,

nssheung/laravel-simple-tryout/php74-httpd/example-app/routes/channels.php

@@ -0,0 +1,18 @@
+<?php
+
+use Illuminate\Support\Facades\Broadcast;
+
+/*
+|--------------------------------------------------------------------------
+| Broadcast Channels
+|--------------------------------------------------------------------------
+|
+| Here you may register all of the event broadcasting channels that your
+| application supports. The given channel authorization callbacks are
+| used to check if an authenticated user can listen to the channel.
+|
+*/
+
+Broadcast::channel('App.Models.User.{id}', function ($user, $id) {
+    return (int) $user->id === (int) $id;
+});