base controller and apply it to all existing controller - codeigniter

Question

I need to create codeigniter base controller to check allowed ip address in database by mobel function if the ip is exists then user should go to home page but if the ip address is not exists and show 404 page in codeigniter, i can't find core folder in application folder

Answer 1

First, you need to extend a core class, call it MY_Controller.php
Save that file in: application/core/MY_Controller.php
class MY_Controller extends CI_Controller {
function __construct()
{
parent::__construct();
$this->load->model('ip_table_model');
$this->load->library('input');
// assuming there's a function called "check_ip($ip_address)" in ip_table_model
if (!$this->ip_table_model->check_ip($this->input->ip_address()) {
redirect('error_404');
}
}
}
Now, we're assuming you have a model called ip_table_model which connects to database with list of IP addresses, and there's a function called check_ip which will validate whether user has access or not. This is relatively simple, and I won't show any examples on this.
The redirect('error_404'); page does not yet exist, you need to create a controller which shows your 404 page.
Now, for any other controllers in your project, instead of extends CI_Controller, make them extend MY_Controller instead.
Here's an example:
class Welcome extends MY_Controller {
function __construct()
{
parent::__construct();
}
function index()
{
$this->load->view('welcome_message');
}
}
Explanation: We're extending CI_Controller to create our own core controller, called MY_Controller. Inside, we're checking if user has access or not through the constructor, which will be called in every other controller in the project.
References:
http://codeigniter.com/user_guide/general/core_classes.html
http://codeigniter.com/user_guide/libraries/input.html

Answer 2

Answer is here (section Extending Core Class).
1.7.2 has a different structure to 2.0.*, therefore there is no core folder in application

Answer 3

In Core Create a new Class .
Name MY_Controller.php
class MY_Controller extends CI_Controller {
// Write your functions here which you wanna use throughout the website
public function abc (){
echo "Helllo";
}
}
class Welcome extends MY_Controller {
function __construct()
{
parent::__construct();
}
function your_custom_fuctions()
{
$this->abc(); //echo Hello...
//Anything you want to do
}
}

Answer 4

function admin_view($view_name = "", $header_info = NULL, $sidebar_info=NULL,$page_info = NULL, $footer_info = NULL, $data_info = ""){
$this->load->view('Admin/includes/header', $header_info);
$this->load->view('Admin/includes/Left_sidebar', $sidebar_info);
$this->load->view($view_name, $page_info);
$this->load->view('common/footer', $footer_info);
}