pocketmine\Server::onPlayerLogin PHP Method

    public function onPlayerLogin(Player $player)
    {
        if ($this->sendUsageTicker > 0) {
            $this->uniquePlayers[$player->getRawUniqueId()] = $player->getRawUniqueId();
        }
        $this->sendFullPlayerListData($player);
        $this->sendRecipeList($player);
    }