diff --git a/common/oatbox/event/EventManager.php b/common/oatbox/event/EventManager.php
index 2ecebcb4a..e6007b3ac 100644
--- a/common/oatbox/event/EventManager.php
+++ b/common/oatbox/event/EventManager.php
@@ -16,7 +16,6 @@
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  *
  * Copyright (c) 2015-2022 (original work) Open Assessment Technologies SA;
- *
  */
 
 namespace oat\oatbox\event;
@@ -36,9 +35,9 @@ class EventManager extends ConfigurableService
      * @deprecated use SERVICE_ID
      */
     const CONFIG_ID = 'generis/event';
-    
+
     const OPTION_LISTENERS = 'listeners';
-    
+
     /**
      * Dispatch an event and trigger its listeners
      *
@@ -48,18 +47,18 @@ class EventManager extends ConfigurableService
     public function trigger($event, $params = [])
     {
         $container = $this->getServiceManager()->getContainer();
-
         $event = is_object($event) ? $event : new GenericEvent($event, $params);
 
         foreach ($this->getListeners($event) as $callback) {
-            if (is_array($callback) && count($callback) == 2) {
-                list($key, $function) = $callback;
+            if (is_array($callback) && count($callback) === 2) {
+                [$key, $function] = $callback;
+
                 if (is_string($key)) {
                     try {
                         $service = $container->get($key);
                         $callback = [$service, $function];
                     } catch (ServiceNotFoundException $e) {
-                        //do nothing
+                        // Do nothing
                     }
                 }
             }
@@ -67,7 +66,7 @@ public function trigger($event, $params = [])
             call_user_func($callback, $event);
         }
     }
-    
+
     /**
      * Attach a Listener to one or multiple events
      *
@@ -90,7 +89,7 @@ public function attach($event, $callback)
         }
         $this->setOption(self::OPTION_LISTENERS, $listeners);
     }
-    
+
     /**
      * remove listener from an event and delete event if it dosn't have any listeners
      * @param array $listeners
@@ -130,7 +129,7 @@ public function detach($event, $callback)
         }
         $this->setOption(self::OPTION_LISTENERS, $listeners);
     }
-    
+
     /**
      * Get all Listeners listening to this kind of event
      *