When an ID is found to be in both Application::controllerMap and Application::modules, the former will take precedence

framework/CHANGELOG.md

@@ -262,6 +262,7 @@ Yii Framework 2 Change Log
 - Chg: Use `limit(null)` instead of `limit(-1)` in migration controller to be compatible to more backends (cebe)
 - Chg: `yii\web\Request::cookieValidationKey` must be explicitly specified for each application that wants to use cookie validation (qiangxue)
 - Chg: Added `yii\composer\Installer::postCreateProject()` and modified the syntax of calling installer methods in composer.json (qiangxue)
+- Chg: When an ID is found to be in both `Application::controllerMap` and `Application::modules`, the former will take precedence (qiangxue)
 - New #3911: Added `yii\behaviors\SluggableBehavior` that fills the specified model attribute with the transliterated and adjusted version to use in URLs (creocoder)
 - New #4193: Added `yii\filters\Cors` CORS filter to allow Cross Origin Resource Sharing (pgaultier)
 - New: Added `yii\base\InvalidValueException` (qiangxue)

framework/base/Module.php

@@ -511,15 +511,14 @@ class Module extends ServiceLocator
         }
 
         // module and controller map take precedence
+        if (isset($this->controllerMap[$id])) {
+            $controller = Yii::createObject($this->controllerMap[$id], [$id, $this]);
+            return [$controller, $route];
+        }
         $module = $this->getModule($id);
         if ($module !== null) {
             return $module->createController($route);
         }
-        if (isset($this->controllerMap[$id])) {
-            $controller = Yii::createObject($this->controllerMap[$id], [$id, $this]);
-
-            return [$controller, $route];
-        }
 
         if (($pos = strrpos($route, '/')) !== false) {
             $id .= '/' . substr($route, 0, $pos);