Use nullsafe operator for event dispatcher (#52024)

Author: seriquynh

src/Illuminate/Auth/Passwords/PasswordBroker.php

@@ -82,9 +82,7 @@ public function sendResetLink(#[\SensitiveParameter] array $credentials, ?Closur
         // the current URI having nothing set in the session to indicate errors.
         $user->sendPasswordResetNotification($token);
 
-        if ($this->events) {
-            $this->events->dispatch(new PasswordResetLinkSent($user));
-        }
+        $this->events?->dispatch(new PasswordResetLinkSent($user));
 
         return static::RESET_LINK_SENT;
     }

src/Illuminate/Auth/SessionGuard.php

@@ -609,9 +609,7 @@ public function logout()
         // If we have an event dispatcher instance, we can fire off the logout event
         // so any further processing can be done. This allows the developer to be
         // listening for anytime a user signs out of this application manually.
-        if (isset($this->events)) {
-            $this->events->dispatch(new Logout($this->name, $user));
-        }
+        $this->events?->dispatch(new Logout($this->name, $user));
 
         // Once we have fired the logout event we will clear the users out of memory
         // so they are no longer available as the user is no longer considered as
@@ -637,9 +635,7 @@ public function logoutCurrentDevice()
         // If we have an event dispatcher instance, we can fire off the logout event
         // so any further processing can be done. This allows the developer to be
         // listening for anytime a user signs out of this application manually.
-        if (isset($this->events)) {
-            $this->events->dispatch(new CurrentDeviceLogout($this->name, $user));
-        }
+        $this->events?->dispatch(new CurrentDeviceLogout($this->name, $user));
 
         // Once we have fired the logout event we will clear the users out of memory
         // so they are no longer available as the user is no longer considered as

src/Illuminate/Log/Logger.php

@@ -244,9 +244,7 @@ protected function fireLogEvent($level, $message, array $context = [])
         // If the event dispatcher is set, we will pass along the parameters to the
         // log listeners. These are useful for building profilers or other tools
         // that aggregate all of the log messages for a given "request" cycle.
-        if (isset($this->dispatcher)) {
-            $this->dispatcher->dispatch(new MessageLogged($level, $message, $context));
-        }
+        $this->dispatcher?->dispatch(new MessageLogged($level, $message, $context));
     }
 
     /**

src/Illuminate/Redis/Connections/Connection.php

@@ -117,11 +117,9 @@ public function command($method, array $parameters = [])
 
         $time = round((microtime(true) - $start) * 1000, 2);
 
-        if (isset($this->events)) {
-            $this->event(new CommandExecuted(
-                $method, $this->parseParametersForEvent($parameters), $time, $this
-            ));
-        }
+        $this->events?->dispatch(new CommandExecuted(
+            $method, $this->parseParametersForEvent($parameters), $time, $this
+        ));
 
         return $result;
     }
@@ -142,6 +140,8 @@ protected function parseParametersForEvent(array $parameters)
      *
      * @param  mixed  $event
      * @return void
+     *
+     * @deprecated since Laravel 11.x
      */
     protected function event($event)
     {