Update all table rows on database by using one query in codeigniter - php

Question

I have table in my database named settings
and it have 3 Fields id, key, value
and i need to update all settings in one page using one query
this is my settings model
class Settings_model extends CI_Model{
/*
* Get global settings
*/
public function get_global_settings() {
$query = $this->db->get('settings');
$result = $query->result();
return $result;
}
/* Update setting */
public function update($data, $id) {
$this->db->where('id', $id);
$this->db->update('settings', $data);
return true;
}
}
and this is my controller
class Settings extends MY_Controller{
public function __construct() {
parent::__construct();
//Access control
if(!$this->session->userdata('logged_in')) {
redirect('admin/login');
}
}
public function index(){
// Get Categories
$data['settings'] = $this->Settings_model->get_global_settings();
// Load View
$data['main_content'] = 'admin/settings/index';
$this->load->view('admin/layouts/main',$data);
}
public function edit($id) {
// Calidation Rules
$this->form_validation->set_rules('value','Name','trim|required|xss_clean');
$data['settings'] = $this->Settings_model->get_group($id);
if($this->form_validation->run() == FALSE) {
// View
$data['main_content'] = 'admin/settings/edit';
$this->load->view('admin/layouts/main',$data);
} else {
// Create Articles Data Array
$data = array (
'value' => $this->input->post('value')
);
// Articles Table Insert
$this->Settings_model->update($data, $id);
// Create message
$this->session->set_flashdata('setting_saved', 'Your setting has been saved');
// Redirect page
redirect('admin/settings');
}
}
}
but it only update one row by id
i need to make a foreach loop to update all rows