feat: 404 controller also can get PageNotFoundException message

system/CodeIgniter.php

@@ -952,7 +952,10 @@ protected function display404errors(PageNotFoundException $e)
                 $this->method     = $override[1];
 
                 $controller = $this->createController();
-                $returned   = $this->runController($controller);
+
+                $returned = $controller->{$this->method}($e->getMessage());
+
+                $this->benchmark->stop('controller');
             }
 
             unset($override);

tests/_support/Errors.php

@@ -0,0 +1,24 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * This file is part of CodeIgniter 4 framework.
+ *
+ * (c) CodeIgniter Foundation <admin@codeigniter.com>
+ *
+ * For the full copyright and license information, please view
+ * the LICENSE file that was distributed with this source code.
+ */
+
+namespace Tests\Support;
+
+use CodeIgniter\Controller;
+
+class Errors extends Controller
+{
+    public function show404(string $message): string
+    {
+        return $message;
+    }
+}

tests/system/CodeIgniterTest.php

@@ -122,21 +122,22 @@ public function testRunClosureRoute(): void
 
     public function testRun404Override(): void
     {
-        $_SERVER['argv'] = ['index.php', '/'];
-        $_SERVER['argc'] = 2;
+        $_SERVER['REQUEST_METHOD'] = 'GET';
+        $_SERVER['REQUEST_URI']    = '/pages/about';
+        $_SERVER['SCRIPT_NAME']    = '/index.php';
 
         // Inject mock router.
         $routes = Services::routes();
         $routes->setAutoRoute(false);
-        $routes->set404Override('Tests\Support\Controllers\Hello::index');
+        $routes->set404Override('Tests\Support\Errors::show404');
         $router = Services::router($routes, Services::incomingrequest());
         Services::injectMock('router', $router);
 
         ob_start();
         $this->codeigniter->run($routes);
         $output = ob_get_clean();
 
-        $this->assertStringContainsString('Hello', $output);
+        $this->assertStringContainsString("Can't find a route for 'GET: pages/about'.", $output);
     }
 
     public function testRun404OverrideControllerReturnsResponse(): void

user_guide_src/source/changelogs/v4.5.0.rst

@@ -341,10 +341,13 @@ Others
 - **AutoRouting Improved:** The ``$translateUriToCamelCase`` option has been added
   that allows using CamelCase controller and method names. See
   :ref:`controller-translate-uri-to-camelcase`.
-- **Routing:** Added option ``$multipleSegmentsOneParam``. When this option is
-  enabled, a placeholder that matches multiple segments, such as ``(:any)``, will
-  be passed directly as it is to one parameter, even if it contains multiple segments.
-  See :ref:`multiple-uri-segments-as-one-parameter` for details.
+- **Routing:**
+    - Added option ``$multipleSegmentsOneParam``. When this option is
+      enabled, a placeholder that matches multiple segments, such as ``(:any)``, will
+      be passed directly as it is to one parameter, even if it contains multiple segments.
+      See :ref:`multiple-uri-segments-as-one-parameter` for details.
+    - Now the 404 controller's method that you set in ``$override404`` also receive
+      a ``PageNotFoundException`` message as the first parameter.
 - **Autoloader:**
     - Autoloading performance when using Composer has been improved.
       Adding the ``App`` namespace in the ``autoload.psr4`` setting in **composer.json**