Login.php

<?php

class Login extends CI_Controller
{
    public function __construct()
    {
        parent::__construct();
        $this->load->model("user_model");
        $this->load->library('form_validation');
        // $this->output->enable_profiler(TRUE);
    }

    public function index()
    {
        if ($this->input->post()) {
            if ($this->user_model->doLogin()) {
                if ($this->session->user_logged->role==1) redirect(site_url('admin'));
                else if ($this->session->user_logged->role==2) redirect(site_url('kasir'));
            }
        }
        $this->load->view("admin/login_page.php");
    }

    public function logout()
    {
        $this->session->sess_destroy();
        redirect(site_url('admin/login'));
    }
}