Session Validation before come to controller

I need Valid is user login form enter below company controller. Please help me to do this session validate. Company controller and login model are below here. 
Controller

Code:

<?php
defined('BASEPATH') OR exit('No direct script access allowed');

class Company extends CI_Controller {

    public function __construct()
    {
        parent::__construct();
       $this->load->model("Login_model");
   }

    public function index()
    {  
        $this->load->view('header');
        $this->load->view('top_header');
        $this->load->view('left_nav');
        $this->load->view('company/index');
        $this->load->view('footer');
        $this->load->view('settings');
    }


    //Add New Company
    public function company_create()
    {

           $this->load->view('includes/header');
           $this->load->view('includes/top_header');
           $this->load->view('includes/left_nav');
           $this->load->view('company/create');
           $this->load->view('includes/footer');
           $this->load->view('includes/settings');


    }

    //Save create company data to DB
    public function save()
    {
       $this->load->helper(array('form', 'url'));
       $this->load->library('form_validation');

       $this->form_validation->set_rules('company_name','Company Name','required|max_length[500]');


       if($this->form_validation->run() == TRUE) {
           $this->load->model('Company_model');
           $this->Company_model->insert();
           redirect('company/all_company');
       }
       else {

           redirect('company/company_create');
       }


    }

    //View Added Company List
    public function all_company()
    {

        $this->load->model('Company_model');
        $data["result"] = $this->Company_model->all_company();

        $this->load->view('includes/header');
        $this->load->view('includes/top_header');
        $this->load->view('includes/left_nav');
        $this->load->view('company/all', $data);
        $this->load->view('includes/footer');
        $this->load->view('includes/settings');
    }

    //View Individual Company Data
    public function view_company($id)
    {    
        $this->load->model('Company_model');
        $data["row"] = $this->Company_model->view_company_data($id);
            

            if ($data["row"] ==null) {
               $this->load->view('includes/header');
               $this->load->view('includes/top_header');
               $this->load->view('includes/left_nav');
               $this->load->view('error_page/404');
               $this->load->view('includes/footer');
               $this->load->view('includes/settings');
            }else{
                $this->load->view('includes/header');
               $this->load->view('includes/top_header');
               $this->load->view('includes/left_nav');
               $this->load->view('company/view', $data);
               $this->load->view('includes/footer');
               $this->load->view('includes/settings');
            }
       
    }

    //Get Data to form to edit data
    public function company_update($id)
    {
        $this->load->model('Company_model');
        $data["company"] = $this->Company_model->get($id);

       if ($data["company"] ==null) {
           $this->load->view('includes/header');
           $this->load->view('includes/top_header');
           $this->load->view('includes/left_nav');
           $this->load->view('error_page/404');
           $this->load->view('includes/footer');
           $this->load->view('includes/settings');
       }
       else {
           $this->load->view('includes/header');
           $this->load->view('includes/top_header');
           $this->load->view('includes/left_nav');
           $this->load->view('company/update', $data);
           $this->load->view('includes/footer');
           $this->load->view('includes/settings');
       }

    }

    //Update create company data to DB
    public function update($id)
    {
        $this->load->model('Company_model');
        $this->Company_model->update($id);
        redirect('company/all_company');
    }

    //Block unwanted Company
    public function company_delete($id)
    {
        $setstatus=array('status' => 1);
        $wherestatus=array('id' => $id);

        $this->load->model('Company_model');
        $this->Company_model->delete('company',$setstatus, $wherestatus);

        redirect("company/all_company");
    }

    //Show blocked company
    public function show_suspended_companies()
    {

        $this->load->model('Company_model');
        $data["result"] = $this->Company_model->get_suspended_companies();

       $this->load->view('includes/header');
       $this->load->view('includes/top_header');
       $this->load->view('includes/left_nav');
       $this->load->view('company/suspended', $data);
       $this->load->view('includes/footer');
       $this->load->view('includes/settings');
    }

    //Unblock the suspended companies
    public function company_un_delete($id)
    {    
        $wherestatus=array('status' => 0);
        $setstatus=array('id' => $id);

        $this->load->model('Company_model');
        $this->Company_model->un_delete('company', $wherestatus, $setstatus);

        redirect("company/all_company");
    }

    public function delete_company_from_db($id)
   {
       $this->load->model('Company_model');
       $data = $this->Company_model->delete_company($id);
           redirect("company/all_company");

   }

    
}

Login Model

Code:

<?php
Class Login_model extends CI_model
{
   public function __construct()
   {
       parent:: __construct();
       $this->load->library('session');
   }

   public function user_create()
   {
       $data["user_name"] = $this->input->post('user_name');
       $data["email"] = $this->input->post('email');
       $data["password"] = $this->input->post('password');
       $data["role"] = $this->input->post('role');
       $data["status"] = 0;
       $this->db->insert('app_user', $data);

   }

   public function auth()
   {
       $email = $this->input->post('email');
       $password = md5($this->input->post('password'));


       $query = $this->db->query("SELECT * FROM app_user WHERE email='$email' AND password='$password'");

       if($query->num_rows() > 0)
       {
           $row = $query->row();
           $this->session->set_userdata('NAME', $row->user_name);
           $this->session->set_userdata('ID', $row->id);
           //$this->session->set_userdata('PHOTO', $row->image);
           return true;
       } else {
           return false;
       }
   }

   public function login_desable()
   {
       $this->session->sess_destroy();
       //$this->auth();
       //unset($_SESSION['NAME']);
   }
}

I have try this app in another hosting account. its work fine. Any one can help me please

You would do the check login in the Company Controller's constructor.

What did you Try? What did you Get? What did you Expect?

Joined CodeIgniter Community 2009.  ( Skype: insitfx )

A method we are using in our project is we created a library called authlibrary. We loaded it in autoload. Then we are calling a check function in the constructor of the function. that is it.
$this->authlib->check_user();

on the constructor of the controller.

CI4 FAN - Codeigniter Performance Specialist.

A better method would be called restrict()

Which would check the user and then do the restriction on them.

PHP Code:

    /**
     * __construct ()
     * -------------------------------------------------------------------
     *
     * Class    Constructor
     *
     * NOTE: Not needed if not setting values or extending a Class.
     */
    public function __construct()
    {
        parent::__construct();

        // restrict this controller to admins only
        $this->auth->restrict('Admin');

        // Load the user model - gets a lists of users
        $this->load->model($this->models."UserModel", 'users');

        log_message('debug', "Users Controller Class Initialized");
    } 


The restrict method would check the users groups to make sure that it was the Admin.

What did you Try? What did you Get? What did you Expect?

Joined CodeIgniter Community 2009.  ( Skype: insitfx )