codeigniter: modify value in view from controller

Question

I am trying to modified value from controller to view. I would like to achieve that when a user is signing up, and submited, I can return feedback from model to controller to view.

my view: main_view

   <?php include('header.php'); ?>
     <?php echo $sign_up_results ?> 

     <?php include('forms/forms.php'); ?>
   <?php include('footer.php'); ?>

my controller

   function __construct(){
    parent::__construct();
    $this->load->helper('url');
    $template = $this->load->View('main_view');
}   

function form_sign_up_controller(){
    $this->load->model("form_sign_up"); 
    $database_insert_results = $this->form_sign_up->insert_user_detail_into_db();
    $data['sign_up_results']=$database_insert_results;
    $template = $this->load->View('main', $data);
}

The problem is when the view is loaded, the value "$sign_up_results" is not yet defined. Is there anyway that I can define the value and then change the value according to the results return from model to controller.

Answer 1

just use is set to check if the parameter is defined or not

<?php if(isset($sign_up_results)) echo $sign_up_results ?>