public function getSessionEventRemainingPlaces(SessionEvent $sessionEvent)
{
$remainingPlaces = null;
$maxUsers = $sessionEvent->getMaxUsers();
if (!is_null($maxUsers)) {
$remainingPlaces = $maxUsers;
$eventUsers = $sessionEvent->getSessionEventUsers();
foreach ($eventUsers as $eventUser) {
if ($eventUser->getRegistrationStatus() === SessionEventUser::REGISTERED) {
--$remainingPlaces;
}
}
}
return $remainingPlaces;
}