class init{
  protected $db;
  private $cache;
  private function __construct() { // tak wiem że jest prywatny ale to dla tego że ta klasa bd singletonem xD
    require_once "config.php";
    require_once "class/Mysqli.php";
    require_once "class/cache.php";
    $this->cache = new Cache();
    $this->cache->test();
  }
  protected function link() {
    $this->db = new MysqliDb (dbhost, dbuser, dbpass, dbbase);
  }
}
class cache extends init{
  public function __construct(){
    $this->link();
  }
}