<?php
 
 final class DemoFile

 {
     protected function _getGroupByDateFormat($type)
     {
-        switch ($type) {
-            case 'day':
-                $format = '%Y-%m-%d';
-                break;
-            default:
-            case 'hour':
-                $format = '%Y-%m-%d %H';
-                break;
-        }
-        return $format;
+        return match ($type) {
+            'day' => '%Y-%m-%d',
+            'hour' => '%Y-%m-%d %H',
+            default => $format,
+        };
     }
 }