application/controllers/login.php

<?php

class Login extends CI_Controller{

    public function __construct(){
        parent::__construct();
        $this->load->model('m_login');

    }

    public function index(){
        $this->load->view('template/header_login');
        $this->load->view('index');
        $this->load->view('template/footer_login');
    }


    public function do_login(){

        $username = $this->input->post('username');
        $password = $this->input->post('password');
        $where = array(
            'is_delete' => 'N',
            'username' => $username
            );
        $cek   = $this->m_login->cek_login("app_user",$where)->num_rows();
        $data['user']  = $this->m_login->GetWhereData('app_user', array('username' => $username));
        if($cek > 0 and password_verify($password,$data['user']['password'])){
            $data_session = array(
                'username' => $username,
                'fua_name' => $data['user']['function_access'],
                'status' => "login"
                );
            $this->load->library('Session/session');
            $this->session->set_userdata($data_session);

            redirect(base_url("home"));

        }else{
            echo "<script>alert('Username atau Password Salah');</script>
                  <script>document.location='".base_url('.')."'</script>";
        }
    }

    public function logout(){
        $this->session->sess_destroy();
        redirect(base_url('.'));
    }

}