How to call codeigniter controller function from view

Question

How to call codeigniter controller function from view? When i call the function in a controller, get a 404 page.

Answer 1

We can also pass controller function as variable in the view page.

class My_controller extends CI_Controller {
    public function index() {
           $data['val']=3;
           $data['square']=function($val){
                               return $val*$val;
                                   };
    $this->load->view('my-view',$data);
}
}

In the view page

Square of 
   

The output is 9