Leverage arrow function syntax for closure

Author: tigitz

Csp/ContentSecurityPolicyHandler.php

@@ -180,9 +180,7 @@ private function generateNonce(): string
      */
     private function generateCspHeader(array $directives): string
     {
-        return array_reduce(array_keys($directives), function ($res, $name) use ($directives) {
-            return ('' !== $res ? $res.'; ' : '').sprintf('%s %s', $name, implode(' ', $directives[$name]));
-        }, '');
+        return array_reduce(array_keys($directives), fn ($res, $name) => ('' !== $res ? $res.'; ' : '').sprintf('%s %s', $name, implode(' ', $directives[$name])), '');
     }
 
     /**

Tests/Controller/ProfilerControllerTest.php

@@ -188,9 +188,7 @@ public function testReturns404onTokenNotFound($withCsp)
         $profiler
             ->expects($this->exactly(2))
             ->method('loadProfile')
-            ->willReturnCallback(function ($token) {
-                return 'found' == $token ? new Profile($token) : null;
-            })
+            ->willReturnCallback(fn ($token) => 'found' == $token ? new Profile($token) : null)
         ;
 
         $controller = $this->createController($profiler, $twig, $withCsp);

Tests/Resources/IconTest.php

@@ -34,6 +34,6 @@ public function testIconFileContents($iconFilePath)
 
     public function provideIconFilePaths()
     {
-        return array_map(function ($filePath) { return (array) $filePath; }, glob(__DIR__.'/../../Resources/views/Icon/*.svg'));
+        return array_map(fn ($filePath) => (array) $filePath, glob(__DIR__.'/../../Resources/views/Icon/*.svg'));
     }
 }