pocketmine\utils\Config::getAll PHP Method

    public function getAll($keys = false)
    {
        return $keys === true ? array_keys($this->config) : $this->config;
    }

 public function registerPlayer(IPlayer $player, $hash)
 {
     $name = trim(strtolower($player->getName()));
     @mkdir($this->plugin->getDataFolder() . "players/" . $name[0] . "/");
     $data = new Config($this->plugin->getDataFolder() . "players/" . $name[0] . "/{$name}.yml", Config::YAML);
     $data->set("registerdate", time());
     $data->set("logindate", time());
     $data->set("lastip", null);
     $data->set("hash", $hash);
     $data->save();
     return $data->getAll();
 }