Function Masuk

function masuk(){
        $username = $this->input->post('username');
        $password = md5($this->input->post('password'));

        $cek = $this->user->cek($username,$password);

        if ($cek->num_rows() == 1) {

            $this->db->select('u.id, u.username, u.password, ud.f_name, ud.l_name');
            $this->db->from('user u');
            $this->db->join('user_detail ud', 'u.username = ud.username', 'inner');
            $this->db->where('u.username', $username);
            $data = $this->db->get()->row_array();
            $data['is_logged_in'] = true;

            $this->session->set_userdata($data);
            redirect('dashboard','refresh');
        }