controller

    function login(){
        $this->load->view('form_login');
    }

    function proses_login() {
        if($this->input->is_ajax_request())
        {
            $username = $this->input->post('username');
            $password = $this->input->post('password');

            $hasil = $this->model_operator->login($username);

            if($hasil['result']){
                if(password_verify($password,$hasil['password'] === TRUE)){

                        $data_session = array(
                            'id_operator'   => $hasil['operator_id'],
                            'nama_operator' => $hasil['nama_lengkap'],
                            'username'      => $hasil['username']
                        );
                        $this->session->set_userdata('user_auth',$data_session);

                        echo json_encode(array('result'=>true,'cek_username' => true));

                    }else{
                        echo json_encode(array('result'=>false,'cek_username' => true));

                    }
            }
        }else{
            redirect(base_url(),'refresh');
        }

    }