When page loads i need access variable from query string - php

Question

I have controller in codeigniter that name is Product. When I access product controller, I am passing cateid variable in URL as query string parameter and getting on product controller.
I have created two methods in controller with names index and productajax . When I click on product link then controller index method executes. I need to use cateid variable value from URL query string in productajax method when page is initially loaded or controller index method being called.
class Product
{
public function index()
{
$cateid= $this->input->get('cateid'):
$this->load->view('product'):
}
public function productajax()
{
// I need to get cateid from index function
}
}

Answer 1

Hope this will help you :
You can do it by creating a public or private variable $cate_id in class and when index loads then
assign $cate_id variable in your index method and when you access productajax you can get cat id in productajax by using $this->cat_id
Your controller should be like this :
// Product class
class Product extends CI_Controller
{
public $cate_id;
public function __construct()
{
parent::__construct();
$this->load->helper('url');
}
public function index()
{
$cateid = $this->input->get('cateid'):
$this->cate_id = $cateid;
$this->load->view('produxt');
}
public function productajax()
{
echo $this->cate_id;
}
}
For more : http://php.net/manual/en/language.oop5.php