User.php

<?php
class User extends CI_Controller {

    public function __construct()
    {
        parent::__construct();
        $this->load->model('user_model');
        $this->load->helper(array('form', 'url'));
        $this->load->library(array('session', 'form_validation'));
    }

    public function index()
    {
        $this->load->view('login/template_login');
    }

    public function register()
    {

        $this->form_validation->set_rules('nama_lengkap', 'Nama Lengkap', 'trim|required|alpha|min_length[3]|max_length[100]');
        $this->form_validation->set_rules('username', 'Username', 'trim|required|alpha|min_length[3]|max_length[50]');
        $this->form_validation->set_rules('email', 'Email', 'trim|required|valid_email|is_unique[user.email]');
        $this->form_validation->set_rules('password', 'Password', 'required');
        //$this->form_validation->set_rules('cpassword', 'Confirm Password', 'trim|required');
        $this->form_validation->set_rules('confirm_password', 'Confirm Password', 'required|matches[password]');

        $data['title'] = 'Register';

        if ($this->form_validation->run() == FALSE)
        {
            $this->load->view('login/template_login', $data);

        }
        else
        {
            if ($this->user_model->set_user())
            {
                $this->session->set_flashdata('msg_success','Registration Successful!');
                redirect('user/register');
            }
            else
            {
                $this->session->set_flashdata('msg_error','Error! Please try again later.');
                redirect('user/register');
            }
        }


    }

    public function login()
    {
        $email = $this->input->post('email');
        $password = $this->input->post('password');

        $this->form_validation->set_rules('email', 'Email', 'trim|required|valid_email');
        $this->form_validation->set_rules('password', 'Password', 'trim|required|md5');

        $data['title'] = 'Login';

        if ($this->form_validation->run() === FALSE)
        {
            $this->load->view('login/template_login', $data);
        }
        else
        {
            if ($user = $this->user_model->get_user_login($email, $password))
            {
                /*$user_data = array(
                              'email' => $email,
                              'is_logged_in' => true
                         );

                $this->session->set_userdata($user_data);*/

                $this->session->set_userdata('email', $email);
                $this->session->set_userdata('user_id', $user['id']);
                $this->session->set_userdata('is_logged_in', true);


                $this->session->set_flashdata('msg_success','Login Successful!');
                redirect('news');
            }
            else
            {
                $this->session->set_flashdata('msg_error','Email atau Password Tidak Valid!');

                $currentClass = $this->router->fetch_class(); // class = controller
                $currentAction = $this->router->fetch_method(); // action = function

                redirect("$currentClass/$currentAction");
                //redirect('user/login');
            }
        }
    }

    public function logout()
    {
        if ($this->session->userdata('is_logged_in')) {

            //$this->session->unset_userdata(array('email' => '', 'is_logged_in' => ''));
            $this->session->unset_userdata('email');
            $this->session->unset_userdata('is_logged_in');
            $this->session->unset_userdata('user_id');
        }
        redirect('user');
    }
}