game/_incl_data/class/Clan/ClanInfo.php

<?php

namespace Clan;

use Core\Db;

class ClanInfo
{
    public static function isJoinable(string $name): bool
    {
        return Db::getValue('select count(name) from clan where name = ? and status = 1', [$name]) > 0;
    }

    public static function getNameById(int $id): string
    {
        Db::getValue('select name from clan where id = ?', [$id]);
    }
}