minor #48793 Leverage arrow function syntax for closure (tigitz)

This PR was merged into the 6.3 branch.

Discussion
----------

Leverage arrow function syntax for closure

| Q             | A
| ------------- | ---
| Branch?       | 6.3
| Bug fix?      | no
| New feature?  | no <!-- please update src/**/CHANGELOG.md files -->
| Deprecations? | no <!-- please update UPGRADE-*.md and src/**/CHANGELOG.md files -->
| Tickets       | Fix #47658 <!-- prefix each issue number with "Fix #", no need to create an issue if none exists, explain below instead -->
| License       | MIT
| Doc PR        | <!-- required for new features -->

Rationale in the RFC [here](https://wiki.php.net/rfc/arrow_functions_v2#introduction)

It's also notable that using arrow function syntax rather than the classic one has been enforced in the past by symfony core member: symfony/symfony#48069 (comment)

So this PR would be consistent.

Commits
-------

f5802d3a2a Leverage arrow function syntax for closure

Author: nicolas-grekas

Authorization/ExpressionLanguageProvider.php

@@ -24,29 +24,13 @@ class ExpressionLanguageProvider implements ExpressionFunctionProviderInterface
     public function getFunctions(): array
     {
         return [
-            new ExpressionFunction('is_authenticated', function () {
-                return '$auth_checker->isGranted("IS_AUTHENTICATED")';
-            }, function (array $variables) {
-                return $variables['auth_checker']->isGranted('IS_AUTHENTICATED');
-            }),
+            new ExpressionFunction('is_authenticated', fn () => '$auth_checker->isGranted("IS_AUTHENTICATED")', fn (array $variables) => $variables['auth_checker']->isGranted('IS_AUTHENTICATED')),
 
-            new ExpressionFunction('is_fully_authenticated', function () {
-                return '$token && $auth_checker->isGranted("IS_AUTHENTICATED_FULLY")';
-            }, function (array $variables) {
-                return $variables['token'] && $variables['auth_checker']->isGranted('IS_AUTHENTICATED_FULLY');
-            }),
+            new ExpressionFunction('is_fully_authenticated', fn () => '$token && $auth_checker->isGranted("IS_AUTHENTICATED_FULLY")', fn (array $variables) => $variables['token'] && $variables['auth_checker']->isGranted('IS_AUTHENTICATED_FULLY')),
 
-            new ExpressionFunction('is_granted', function ($attributes, $object = 'null') {
-                return sprintf('$auth_checker->isGranted(%s, %s)', $attributes, $object);
-            }, function (array $variables, $attributes, $object = null) {
-                return $variables['auth_checker']->isGranted($attributes, $object);
-            }),
+            new ExpressionFunction('is_granted', fn ($attributes, $object = 'null') => sprintf('$auth_checker->isGranted(%s, %s)', $attributes, $object), fn (array $variables, $attributes, $object = null) => $variables['auth_checker']->isGranted($attributes, $object)),
 
-            new ExpressionFunction('is_remember_me', function () {
-                return '$token && $auth_checker->isGranted("IS_REMEMBERED")';
-            }, function (array $variables) {
-                return $variables['token'] && $variables['auth_checker']->isGranted('IS_REMEMBERED');
-            }),
+            new ExpressionFunction('is_remember_me', fn () => '$token && $auth_checker->isGranted("IS_REMEMBERED")', fn (array $variables) => $variables['token'] && $variables['auth_checker']->isGranted('IS_REMEMBERED')),
         ];
     }
 }

Tests/Authentication/Token/Storage/UsageTrackingTokenStorageTest.php

@@ -68,9 +68,7 @@ public function testGetSetToken()
 
     public function testWithoutMainRequest()
     {
-        $locator = new class(['request_stack' => function () {
-            return new RequestStack();
-        }]) implements ContainerInterface {
+        $locator = new class(['request_stack' => fn () => new RequestStack()]) implements ContainerInterface {
             use ServiceLocatorTrait;
         };
         $tokenStorage = new TokenStorage();

Tests/Resources/TranslationFilesTest.php

@@ -45,7 +45,7 @@ public function testTranslationFileIsValidWithoutEntityLoader($filePath)
     public function provideTranslationFiles()
     {
         return array_map(
-            function ($filePath) { return (array) $filePath; },
+            fn ($filePath) => (array) $filePath,
             glob(\dirname(__DIR__, 2).'/Resources/translations/*.xlf')
         );
     }