public function actionIdenticon()
 {
     //        $assetPrefix = Yii::app()->assetManager->publish(dirname(__FILE__) . '/../assets', true, 0, defined('YII_DEBUG'));
     //        Yii::app()->clientScript->registerScriptFile($assetPrefix . '/md5.min.js');
     //        Yii::app()->clientScript->registerScriptFile($assetPrefix . '/jdenticon-1.3.0.min.js');
     if (isset($_POST['userids'])) {
         // Loop through selected users
         foreach ($_POST['userids'] as $user_id) {
             // Find User by ID
             $user = User::findIdentity($user_id);
             // Upload new profile picture
             $this->uploadProfilePicture($user->guid, $_POST['identicon_' . $user_id . '_value']);
         }
     }
     $searchModel = new \humhub\modules\admin\models\UserSearch();
     $dataProvider = $searchModel->search(Yii::$app->request->queryParams);
     return $this->render('identicon', array('dataProvider' => $dataProvider, 'searchModel' => $searchModel));
 }