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plugins/system/logout/logout.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<extension type="plugin" group="system" method="upgrade">
+	<name>plg_system_logout</name>
+	<author>Joomla! Project</author>
+	<creationDate>2009-04</creationDate>
+	<copyright>(C) 2009 Open Source Matters, Inc.</copyright>
+	<license>GNU General Public License version 2 or later; see LICENSE.txt</license>
+	<authorEmail>admin@joomla.org</authorEmail>
+	<authorUrl>www.joomla.org</authorUrl>
+	<version>3.0.0</version>
+	<description>PLG_SYSTEM_LOGOUT_XML_DESCRIPTION</description>
+	<namespace path="src">Joomla\Plugin\System\Logout</namespace>
+	<files>
+		<folder plugin="logout">services</folder>
+		<folder>src</folder>
+	</files>
+	<languages>
+		<language tag="en-GB">language/en-GB/plg_system_logout.ini</language>
+		<language tag="en-GB">language/en-GB/plg_system_logout.sys.ini</language>
+	</languages>
+</extension>

plugins/system/logout/services/provider.php

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+<?php
+
+/**
+ * @package     Joomla.Plugin
+ * @subpackage  System.logout
+ *
+ * @copyright   (C) 2023 Open Source Matters, Inc. <https://www.joomla.org>
+ * @license     GNU General Public License version 2 or later; see LICENSE.txt
+ */
+
+\defined('_JEXEC') or die;
+
+use Joomla\CMS\Extension\PluginInterface;
+use Joomla\CMS\Factory;
+use Joomla\CMS\Plugin\PluginHelper;
+use Joomla\DI\Container;
+use Joomla\DI\ServiceProviderInterface;
+use Joomla\Event\DispatcherInterface;
+use Joomla\Plugin\System\Logout\Extension\Logout;
+
+return new class () implements ServiceProviderInterface {
+    /**
+     * Registers the service provider with a DI container.
+     *
+     * @param   Container  $container  The DI container.
+     *
+     * @return  void
+     *
+     * @since   4.4.0
+     */
+    public function register(Container $container): void
+    {
+        $container->set(
+            PluginInterface::class,
+            function (Container $container) {
+                return new Logout(
+                    $container->get(DispatcherInterface::class),
+                    (array) PluginHelper::getPlugin('system', 'logout'),
+                    Factory::getApplication()
+                );
+            }
+        );
+    }
+};

plugins/system/logout/src/Extension/Logout.php

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+<?php
+
+/**
+ * @package     Joomla.Plugin
+ * @subpackage  System.logout
+ *
+ * @copyright   (C) 2010 Open Source Matters, Inc. <https://www.joomla.org>
+ * @license     GNU General Public License version 2 or later; see LICENSE.txt
+ */
+
+namespace Joomla\Plugin\System\Logout\Extension;
+
+use Joomla\CMS\Application\ApplicationHelper;
+use Joomla\CMS\Application\CMSApplicationInterface;
+use Joomla\CMS\Plugin\CMSPlugin;
+use Joomla\Event\DispatcherInterface;
+
+// phpcs:disable PSR1.Files.SideEffects
+\defined('_JEXEC') or die;
+// phpcs:enable PSR1.Files.SideEffects
+
+/**
+ * Plugin class for logout redirect handling.
+ *
+ * @since  1.6
+ */
+final class Logout extends CMSPlugin
+{
+    /**
+     * @param   DispatcherInterface      $dispatcher  The object to observe -- event dispatcher.
+     * @param   array                    $config      An optional associative array of configuration settings.
+     * @param   CMSApplicationInterface  $app         The object to observe -- event dispatcher.
+     *
+     * @since   1.6
+     */
+    public function __construct(DispatcherInterface $dispatcher, array $config, CMSApplicationInterface $app)
+    {
+        parent::__construct($dispatcher, $config);
+
+        $this->setApplication($app);
+
+        // If we are on admin don't process.
+        if (!$this->getApplication()->isClient('site')) {
+            return;
+        }
+
+        $hash  = ApplicationHelper::getHash('PlgSystemLogout');
+
+        if ($this->getApplication()->getInput()->cookie->getString($hash)) {
+            // Destroy the cookie.
+            $this->getApplication()->getInput()->cookie->set(
+                $hash,
+                '',
+                1,
+                $this->getApplication()->get('cookie_path', '/'),
+                $this->getApplication()->get('cookie_domain', '')
+            );
+        }
+    }
+
+    /**
+     * Method to handle any logout logic and report back to the subject.
+     *
+     * @param   array  $user     Holds the user data.
+     * @param   array  $options  Array holding options (client, ...).
+     *
+     * @return  boolean  Always returns true.
+     *
+     * @since   1.6
+     */
+    public function onUserLogout($user, $options = [])
+    {
+        if ($this->getApplication()->isClient('site')) {
+            // Create the cookie.
+            $this->getApplication()->getInput()->cookie->set(
+                ApplicationHelper::getHash('PlgSystemLogout'),
+                true,
+                time() + 86400,
+                $this->getApplication()->get('cookie_path', '/'),
+                $this->getApplication()->get('cookie_domain', ''),
+                $this->getApplication()->isHttpsForced(),
+                true
+            );
+        }
+
+        return true;
+    }
+}