Fix typing

Author: rmpel

src/Base/RestAPI/Controllers/BaseController.php

@@ -6,9 +6,9 @@
 
 namespace OWC\PDC\Base\RestAPI\Controllers;
 
+use OWC\PDC\Base\Foundation\Plugin;
 use WP_Query;
 use WP_REST_Request;
-use OWC\PDC\Base\Foundation\Plugin;
 
 /**
  * Controller which handels general quering, such as pagination.
@@ -119,14 +119,14 @@ protected function defaultTaxonomyParamIsValid(WP_REST_Request $request, string
         return true;
     }
 
-    protected function getOrderClause(mixed $orderBy, mixed $order)
+    protected function getOrderClause(string $orderBy, string $order): array
     {
         $orderArray = [];
         $orderByParts = explode(',', $orderBy);
         $orderParts = explode(',', $order);
 
         // Empty string results in array with one empty value, we ignore that.
-        if (!array_filter($orderByParts)) {
+        if (! array_filter($orderByParts)) {
             return [];
         }