Ojs\AdminBundle\EventListener\AdminEventListener::onSettingsChange PHP Method

    public function onSettingsChange(AdminEvent $event)
    {
        $getMailEvent = $this->ojsMailer->getEventByName(AdminEvents::SETTINGS_CHANGE);
        if (!$getMailEvent) {
            return;
        }
        foreach ($this->ojsMailer->getAdminUsers() as $user) {
            $transformParams = ['done.by' => $this->ojsMailer->currentUser()->getUsername(), 'receiver.username' => $user->getUsername(), 'receiver.fullName' => $user->getFullName()];
            $template = $this->ojsMailer->transformTemplate($getMailEvent->getTemplate(), $transformParams);
            $this->ojsMailer->sendToUser($user, $getMailEvent->getSubject(), $template);
        }
    }