To get 4 players into random teams?

Hello, I want to get 4 random players from here and send them a message like “You got the secret message”. Anyway to do this here.

PHP:

public function startGame() {
        $players = [];
        foreach ($this->players as $player) {
            $players[$player->getName()] = $player;
            $player->setGamemode($player::SURVIVAL);
        }


        $this->players = $players;

 

PHP:

$players = array_rand($this->getServer()->getOnlinePlayers(), 4); //number of players (or elements) to randomly pick from the array


 

Thanks