Make use of the nullsafe operator

Author: derrabus

Server/DumpServer.php

@@ -56,25 +56,19 @@ public function listen(callable $callback): void
         }
 
         foreach ($this->getMessages() as $clientId => $message) {
-            if ($this->logger) {
-                $this->logger->info('Received a payload from client {clientId}', ['clientId' => $clientId]);
-            }
+            $this->logger?->info('Received a payload from client {clientId}', ['clientId' => $clientId]);
 
             $payload = @unserialize(base64_decode($message), ['allowed_classes' => [Data::class, Stub::class]]);
 
             // Impossible to decode the message, give up.
             if (false === $payload) {
-                if ($this->logger) {
-                    $this->logger->warning('Unable to decode a message from {clientId} client.', ['clientId' => $clientId]);
-                }
+                $this->logger?->warning('Unable to decode a message from {clientId} client.', ['clientId' => $clientId]);
 
                 continue;
             }
 
             if (!\is_array($payload) || \count($payload) < 2 || !$payload[0] instanceof Data || !\is_array($payload[1])) {
-                if ($this->logger) {
-                    $this->logger->warning('Invalid payload from {clientId} client. Expected an array of two elements (Data $data, array $context)', ['clientId' => $clientId]);
-                }
+                $this->logger?->warning('Invalid payload from {clientId} client. Expected an array of two elements (Data $data, array $context)', ['clientId' => $clientId]);
 
                 continue;
             }