login extends controller

class login extends controller{

    function login()
    {
        parent::controller();
    }

    function index()
    {
        $this->load->view("login");
    }

    function chklogin()
    {
        $this->culogin->login($_POST["account"],$_POST["password"]);
        $this->culogin->islogin();
    }

    function logout(){
        $this->session->unset_userdata("login");
        redirect("main","location");
    }
}