How to get method to retrieve data from url in CodeIgniter?

It's behavior is fairly intuitive. So, the first parameter you have passes becomes the first segment, the second one becomes the second segment and so on.

Example code:

<?php
class Home extends CI_Controller {
 
    public function index($memid, $some_other_parameter)
    {
        echo $memid;
    }
}
?>

If you call www.example.com?memid=1100, it will echo 1100, provided the Home controller is routed correctly.

You can also use the http://ellislab.com/c to get these parameters.

For your query: $this->input->get('memid', TRUE);