Feat: Remove space after fn declaration as defined in PER2.0

Author: OndraM

ecs.php

@@ -68,6 +68,7 @@
 use PhpCsFixer\Fixer\FunctionNotation\CombineNestedDirnameFixer;
 use PhpCsFixer\Fixer\FunctionNotation\FopenFlagOrderFixer;
 use PhpCsFixer\Fixer\FunctionNotation\FopenFlagsFixer;
+use PhpCsFixer\Fixer\FunctionNotation\FunctionDeclarationFixer;
 use PhpCsFixer\Fixer\FunctionNotation\ImplodeCallFixer;
 use PhpCsFixer\Fixer\FunctionNotation\LambdaNotUsedImportFixer;
 use PhpCsFixer\Fixer\FunctionNotation\NoUnreachableDefaultArgumentValueFixer;
@@ -541,6 +542,11 @@
             ],
         ],
     )
+    // Spaces should be properly placed in a function declaration.
+    ->withConfiguredRule(
+        FunctionDeclarationFixer::class,
+        ['closure_fn_spacing' => 'none'], // Defined in PER 2.0
+    )
     ->withSkip([
         // We allow empty catch statements (but they must have comment - see EmptyCatchCommentSniff)
         EmptyStatementSniff::class . '.DetectedCatch' => null,

tests/Integration/Fixtures/Basic.correct.php.inc

@@ -38,8 +38,16 @@ class Basic
         return false; // BlankLineBeforeStatementFixer
     }
 
-    public function fooBar(mixed $foo): mixed
+    public function fooBar(mixed $foo): mixed // FunctionDeclarationFixer
     {
+        $value = 5;
+        // FunctionDeclarationFixer
+        $function = function ($foo) use ($value) {
+            return $foo + $value;
+        };
+        // FunctionDeclarationFixer
+        $fn = fn($foo) => $foo + $value;
+
         // PhpdocToCommentFixer
         /*
          * Phpdoc used instead of plain comment

tests/Integration/Fixtures/Basic.wrong.php.inc

@@ -31,8 +31,16 @@ class Basic
 
     public const MY_PUBLIC_CONST = 333; // OrderedClassElementsFixer
 
-    public function fooBar(mixed $foo): mixed
+    public function fooBar ( mixed    $foo ): mixed // FunctionDeclarationFixer
     {
+        $value = 5;
+        // FunctionDeclarationFixer
+        $function = function($foo)use($value) {
+            return $foo + $value;
+        };
+        // FunctionDeclarationFixer
+        $fn = fn ($foo) => $foo + $value;
+
         // PhpdocToCommentFixer
         /**
          * Phpdoc used instead of plain comment