Logout SIMPEL

// Logout
    public function logout_post()
    {
        $username = trim($this->post('username'));

        if ($username == '') {
            $response = [
                'resp_error' => true,
                'resp_msg'   => 'Username Kosong.',
            ];
        } else {
            $data = array(
                'device_id' => '',
            );

            $this->db->where('user_username', $username);
            $this->db->update('lemlit_users', $data);

            $response = [
                'resp_error' => false,
                'resp_msg'   => 'Device ID Updated.',
            ];
        }

        $this->response($response, 200);
    }