perf: autoloader

admin/starter/composer.json

@@ -19,6 +19,9 @@
         "phpunit/phpunit": "^9.1"
     },
     "autoload": {
+        "psr-4": {
+            "App\\": "app/"
+        },
         "exclude-from-classmap": [
             "**/Database/Migrations/**"
         ]

app/Config/Autoload.php

@@ -30,23 +30,18 @@ class Autoload extends AutoloadConfig
      * their location on the file system. These are used by the autoloader
      * to locate files the first time they have been instantiated.
      *
-     * The '/app' and '/system' directories are already mapped for you.
-     * you may change the name of the 'App' namespace if you wish,
+     * The 'Config' (APPPATH . 'Config') and 'CodeIgniter' (SYSTEMPATH) are
+     * already mapped for you.
+     *
+     * You may change the name of the 'App' namespace if you wish,
      * but this should be done prior to creating any namespaced classes,
      * else you will need to modify all of those classes for this to work.
      *
-     * Prototype:
-     *   $psr4 = [
-     *       'CodeIgniter' => SYSTEMPATH,
-     *       'App'         => APPPATH
-     *   ];
-     *
      * @var array<string, array<int, string>|string>
      * @phpstan-var array<string, string|list<string>>
      */
     public $psr4 = [
-        APP_NAMESPACE => APPPATH, // For custom app namespace
-        'Config'      => APPPATH . 'Config',
+        APP_NAMESPACE => APPPATH,
     ];
 
     /**

composer.json

@@ -58,7 +58,8 @@
     },
     "autoload": {
         "psr-4": {
-            "CodeIgniter\\": "system/"
+            "CodeIgniter\\": "system/",
+            "Config\\": "app/Config/"
         },
         "exclude-from-classmap": [
             "**/Database/Migrations/**"

system/Autoloader/Autoloader.php

@@ -137,8 +137,6 @@ private function loadComposerInfo(Modules $modules): void
          */
         $composer = include COMPOSER_PATH;
 
-        $this->loadComposerClassmap($composer);
-
         // Should we load through Composer's namespaces, also?
         if ($modules->discoverInComposer) {
             // @phpstan-ignore-next-line
@@ -155,11 +153,11 @@ private function loadComposerInfo(Modules $modules): void
      */
     public function register()
     {
-        // Prepend the PSR4  autoloader for maximum performance.
-        spl_autoload_register([$this, 'loadClass'], true, true);
+        // Register classmap loader for the files in our class map.
+        spl_autoload_register([$this, 'loadClassmap'], true);
 
-        // Now prepend another loader for the files in our class map.
-        spl_autoload_register([$this, 'loadClassmap'], true, true);
+        // Register the PSR-4 autoloader.
+        spl_autoload_register([$this, 'loadClass'], true);
 
         // Load our non-class files
         foreach ($this->files as $file) {
@@ -362,9 +360,13 @@ private function loadComposerNamespaces(ClassLoader $composer, array $composerPa
     {
         $namespacePaths = $composer->getPrefixesPsr4();
 
-        // Get rid of CodeIgniter so we don't have duplicates
-        if (isset($namespacePaths['CodeIgniter\\'])) {
-            unset($namespacePaths['CodeIgniter\\']);
+        // Get rid of duplicated namespaces.
+        $duplicatedNamespaces = ['CodeIgniter', APP_NAMESPACE, 'Config'];
+
+        foreach ($duplicatedNamespaces as $ns) {
+            if (isset($namespacePaths[$ns . '\\'])) {
+                unset($namespacePaths[$ns . '\\']);
+            }
         }
 
         if (! method_exists(InstalledVersions::class, 'getAllRawData')) {
@@ -428,13 +430,6 @@ private function loadComposerNamespaces(ClassLoader $composer, array $composerPa
         $this->addNamespace($newPaths);
     }
 
-    private function loadComposerClassmap(ClassLoader $composer): void
-    {
-        $classes = $composer->getClassMap();
-
-        $this->classmap = array_merge($this->classmap, $classes);
-    }
-
     /**
      * Locates autoload information from Composer, if available.
      *

system/Config/AutoloadConfig.php

@@ -92,7 +92,7 @@ class AutoloadConfig
      */
     protected $corePsr4 = [
         'CodeIgniter' => SYSTEMPATH,
-        'App'         => APPPATH, // To ensure filters, etc still found,
+        'Config'      => APPPATH . 'Config',
     ];
 
     /**

tests/system/Commands/Utilities/NamespacesTest.php

@@ -56,8 +56,8 @@ public function testNamespacesCommandCodeIgniterOnly(): void
             | Namespace     | Path                    | Found? |
             +---------------+-------------------------+--------+
             | CodeIgniter   | ROOTPATH/system         | Yes    |
-            | App           | ROOTPATH/app            | Yes    |
             | Config        | APPPATH/Config          | Yes    |
+            | App           | ROOTPATH/app            | Yes    |
             | Tests\Support | ROOTPATH/tests/_support | Yes    |
             +---------------+-------------------------+--------+
             EOL;

tests/system/Config/ConfigTest.php

@@ -46,13 +46,6 @@ public function testCreateSharedInstance(): void
         $this->assertSame($Config2, $Config);
     }
 
-    public function testCreateNonConfig(): void
-    {
-        $Config = Config::get('Constants', false);
-
-        $this->assertNull($Config);
-    }
-
     /**
      * @runInSeparateProcess
      * @preserveGlobalState disabled

user_guide_src/source/changelogs/v4.5.0.rst

@@ -116,6 +116,10 @@ Helpers and Functions
 Others
 ======
 
+- **Autoloader:** Autoloading performance when using Composer has been improved.
+  Adding the ``App`` namespace in the ``autoload.psr4`` setting in **composer.json**
+  may also improve the performance of your app. See :ref:`autoloader-application-namespace`.
+
 Message Changes
 ***************
 

user_guide_src/source/concepts/autoloader.rst

@@ -13,6 +13,7 @@ classes that your project is using. Keeping track of where every single file is,
 hard-coding that location into your files in a series of ``requires()`` is a massive
 headache and very error-prone. That's where autoloaders come in.
 
+***********************
 CodeIgniter4 Autoloader
 ***********************
 
@@ -36,12 +37,14 @@ beginning of the framework's execution.
     file name case is incorrect, the autoloader cannot find the file on the
     server.
 
+*************
 Configuration
 *************
 
 Initial configuration is done in **app/Config/Autoload.php**. This file contains two primary
 arrays: one for the classmap, and one for PSR-4 compatible namespaces.
 
+**********
 Namespaces
 **********
 
@@ -61,21 +64,53 @@ The value is the location to the directory the classes can be found in.
 
         php spark namespaces
 
+.. _autoloader-application-namespace:
+
+Application Namespace
+=====================
+
 By default, the application directory is namespace to the ``App`` namespace. You must namespace the controllers,
 libraries, or models in the application directory, and they will be found under the ``App`` namespace.
 
+Config Namespace
+----------------
+
+Config files are namespaced in the ``Config`` namespace, not in ``App\Config`` as you might
+expect. This allows the core system files to always be able to locate them, even when the application
+namespace has changed.
+
+Changing App Namespace
+----------------------
+
 You may change this namespace by editing the **app/Config/Constants.php** file and setting the
 new namespace value under the ``APP_NAMESPACE`` setting:
 
 .. literalinclude:: autoloader/002.php
    :lines: 2-
 
-You will need to modify any existing files that are referencing the current namespace.
+And if you use Composer autoloader, you also need to change the ``App`` namespace
+in your **composer.json**, and run ``composer dump-autoload``.
 
-.. important:: Config files are namespaced in the ``Config`` namespace, not in ``App\Config`` as you might
-    expect. This allows the core system files to always be able to locate them, even when the application
-    namespace has changed.
+.. code-block:: text
 
+    {
+        ...
+        "autoload": {
+            "psr-4": {
+                "App\\": "app/"    <-- Change
+            },
+            ...
+        },
+        ...
+    }
+
+.. note:: Since v4.5.0 appstarter, the ``App\\`` namespace has been added to
+    **composer.json**'s ``autoload.psr-4``. If your **composer.json** does not
+    have it, adding it may improve your app's autoloading performance.
+
+You will need to modify any existing files that are referencing the current namespace.
+
+********
 Classmap
 ********
 
@@ -87,12 +122,21 @@ third-party libraries that are not namespaced:
 
 The key of each row is the name of the class that you want to locate. The value is the path to locate it at.
 
+****************
 Composer Support
 ****************
 
-Composer support is automatically initialized by default. By default, it looks for Composer's autoload file at
+Composer support is automatically initialized by default.
+
+By default, it looks for Composer's autoload file at
 ``ROOTPATH . 'vendor/autoload.php'``. If you need to change the location of that file for any reason, you can modify
 the value defined in **app/Config/Constants.php**.
 
-.. note:: If the same namespace is defined in both CodeIgniter and Composer, CodeIgniter's autoloader will be
+Priority of Autoloaders
+=======================
+
+If the same namespace is defined in both CodeIgniter and Composer, Composer's
+autoloader will be the first one to get a chance to locate the file.
+
+.. note:: Prior to v4.5.0, if the same namespace was defined in both CodeIgniter and Composer, CodeIgniter's autoloader was
     the first one to get a chance to locate the file.

user_guide_src/source/concepts/autoloader/001.php

@@ -8,8 +8,7 @@ class Autoload extends AutoloadConfig
 {
     // ...
     public $psr4 = [
-        APP_NAMESPACE => APPPATH, // For custom app namespace
-        'Config'      => APPPATH . 'Config',
+        APP_NAMESPACE => APPPATH,
     ];
 
     // ...

user_guide_src/source/dbmgmt/migration.rst

@@ -93,6 +93,7 @@ For example, assume that we have the following namespaces defined in our Autoloa
 configuration file:
 
 .. literalinclude:: migration/004.php
+    :lines: 2-
 
 This will look for any migrations located at both **APPPATH/Database/Migrations** and
 **ROOTPATH/MyCompany/Database/Migrations**. This makes it simple to include migrations in your

user_guide_src/source/dbmgmt/migration/004.php

@@ -1,6 +1,6 @@
 <?php
 
 $psr4 = [
-    'App'       => APPPATH,
-    'MyCompany' => ROOTPATH . 'MyCompany',
+    APP_NAMESPACE => APPPATH,
+    'MyCompany'   => ROOTPATH . 'MyCompany',
 ];

user_guide_src/source/general/modules/001.php

@@ -6,9 +6,9 @@
 
 class Autoload extends AutoloadConfig
 {
+    // ...
     public $psr4 = [
-        APP_NAMESPACE => APPPATH, // For custom namespace
-        'Config'      => APPPATH . 'Config',
+        APP_NAMESPACE => APPPATH,
         'Acme\Blog'   => ROOTPATH . 'acme/Blog',
     ];