OEModule\OphCoMessaging\controllers\DefaultController::actionMarkRead PHP Method

    public function actionMarkRead($id)
    {
        $el = $this->getMessageElement();
        if ($el->comments && $this->isSender(\Yii::app()->user)) {
            $this->markCommentRead($el);
        } else {
            $this->markMessageRead($el);
        }
        $this->redirectAfterAction();
    }