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                <?php  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                namespace BeyondCode\LaravelWebSockets\WebSockets\Channels;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use BeyondCode\LaravelWebSockets\Dashboard\DashboardLogger;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use BeyondCode\LaravelWebSockets\WebSockets\Exceptions\InvalidSignature;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Illuminate\Support\Str;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Ratchet\ConnectionInterface;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use stdClass;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                class Channel  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /** @var string */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    protected $channelName;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /** @var \Ratchet\ConnectionInterface[] */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    protected $subscribedConnections = [];  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function __construct(string $channelName)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->channelName = $channelName;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                    public function getName(): string  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    { | 
            
            
                                                                        
                            
            
                                    
            
            
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                        return $this->channelName;  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function hasConnections(): bool  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return count($this->subscribedConnections) > 0;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function getSubscribedConnections(): array  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return $this->subscribedConnections;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    protected function verifySignature(ConnectionInterface $connection, stdClass $payload)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $signature = "{$connection->socketId}:{$this->channelName}"; | 
            
                            
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                        if (isset($payload->channel_data)) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $signature .= ":{$payload->channel_data}"; | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if (Str::after($payload->auth, ':') !== hash_hmac('sha256', $signature, $connection->app->secret)) { | 
            
                            
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                            throw new InvalidSignature();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /*  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @link https://pusher.com/docs/pusher_protocol#presence-channel-events  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function subscribe(ConnectionInterface $connection, stdClass $payload)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->saveConnection($connection);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $connection->send(json_encode([  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            'event' => 'pusher_internal:subscription_succeeded',  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            'channel' => $this->channelName,  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        ]));  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function unsubscribe(ConnectionInterface $connection)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        unset($this->subscribedConnections[$connection->socketId]);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if (! $this->hasConnections()) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            DashboardLogger::vacated($connection, $this->channelName);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    protected function saveConnection(ConnectionInterface $connection)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $hadConnectionsPreviously = $this->hasConnections();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->subscribedConnections[$connection->socketId] = $connection;  | 
            
                            
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                        if (! $hadConnectionsPreviously) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            DashboardLogger::occupied($connection, $this->channelName);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        DashboardLogger::subscribed($connection, $this->channelName);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function broadcast($payload)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        foreach ($this->subscribedConnections as $connection) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $connection->send(json_encode($payload));  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function broadcastToOthers(ConnectionInterface $connection, $payload)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->broadcastToEveryoneExcept($payload, $connection->socketId);  | 
            
                            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function broadcastToEveryoneExcept($payload, ?string $socketId = null)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if (is_null($socketId)) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            return $this->broadcast($payload);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        foreach ($this->subscribedConnections as $connection) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            if ($connection->socketId !== $socketId) { | 
            
                            
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                                $connection->send(json_encode($payload));  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function toArray(): array  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return [  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            'occupied' => count($this->subscribedConnections) > 0,  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            'subscription_count' => count($this->subscribedConnections),  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        ];  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                }  | 
            
            
                                                        
            
                                    
            
            
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If you access a property on an interface, you most likely code against a concrete implementation of the interface.
Available Fixes
Adding an additional type check:
Changing the type hint: