CS: static closures should be static

Author: jrfnl

autoload.php

@@ -210,7 +210,7 @@ public static function determineLoadedClass($classesBeforeLoad, $classesAfterLoa
             // That way, at the end, only the "main" class just included will remain.
             $newClasses = array_reduce(
                 $newClasses,
-                function ($remaining, $current) {
+                static function ($remaining, $current) {
                     return array_diff($remaining, class_parents($current));
                 },
                 $newClasses

src/Reports/Summary.php

@@ -98,7 +98,7 @@ public function generate(
 
         uksort(
             $reportFiles,
-            function ($keyA, $keyB) {
+            static function ($keyA, $keyB) {
                 $pathPartsA = explode(DIRECTORY_SEPARATOR, $keyA);
                 $pathPartsB = explode(DIRECTORY_SEPARATOR, $keyB);
 

src/Util/Cache.php

@@ -105,7 +105,7 @@ public static function load(Ruleset $ruleset, Config $config)
         );
         $filter = new RecursiveCallbackFilterIterator(
             $di,
-            function ($file, $key, $iterator) {
+            static function ($file, $key, $iterator) {
                 // Skip non-php files.
                 $filename = $file->getFilename();
                 if ($file->isFile() === true && substr($filename, -4) !== '.php') {

src/Util/MessageCollector.php

@@ -298,7 +298,7 @@ private function arrayColumn(array $input, $columnKey)
         }
 
         // PHP 5.4.
-        $callback = function ($row) use ($columnKey) {
+        $callback = static function ($row) use ($columnKey) {
             return $row[$columnKey];
         };