Player Count

How can I set the player count from my server [In the menue befor you join the Server]
And how can I set the max players?

Duplicate of https://forums.pocketmine.net/threads/set-the-player-count.10611/

This is code

PHP:

Public function Playermax(\pocketmine\event\server\QueryRegenerateEvent $ev){
   $ev->setMaxPlayers($count);
}

Thanks