add type to prevent ide-warnings, closes #1469

Closes #1469

Merge request studip/studip!917

app/controllers/my_courses.php

@@ -28,6 +28,9 @@ require_once 'lib/object.inc.php';
 
 class MyCoursesController extends AuthenticatedController
 {
+    /**
+     * @var Callable
+     */
     private $performance_timer = null;
 
     public function before_filter(&$action, &$args)

lib/classes/Metrics.php

@@ -159,7 +159,7 @@ class Metrics {
      *
      * @endcode
      *
-     * @return function  the timing function
+     * @return Callable  the timing function
      */
     public static function startTimer()
     {