Pass query results from the model through the controller to the view in CodeIgniter 3

I am learning CodeIgniter and i got stuck on this error.There must be some silly mistake. I am using xampp software for this. It keeps popping undefined variable rows.

• table name is 'user'.
• view file name is try.
• model file name is trydb.
• controller file name is condb.

ERROR

A PHP Error was encountered

Severity: Notice

Message: Undefined variable: rows

Filename: views/try.php

Line Number: 12

Backtrace:

File: C:\xampp\htdocs\ciagain\application\views\try.php
Line: 12
Function: _error_handler

File: C:\xampp\htdocs\ciagain\application\controllers\Welcome.php
Line: 27
Function: view

File: C:\xampp\htdocs\ciagain\index.php
Line: 292
Function: require_once

A PHP Error was encountered

Severity: Warning

Message: Invalid argument supplied for foreach()

Filename: views/try.php

Line Number: 12

Backtrace:

File: C:\xampp\htdocs\ciagain\application\views\try.php
Line: 12
Function: _error_handler

File: C:\xampp\htdocs\ciagain\application\controllers\Welcome.php
Line: 27
Function: view

File: C:\xampp\htdocs\ciagain\index.php
Line: 292
Function: require_once

View File

Connecting data base ID; echo $r->Name; }

?>
    </body>
</html>

Modal File

<?php

    class Site_model extends Model {
        
        function getAll() {
            $q = $this->db->get('user');
            
            if($q->num_rows()>0) {
                foreach ($q->result() as $row) {
                    $data[] = $row;
                }
            return $data;
            }
        }
        
        
        }
        ?>

Controller file

<?php

class Site extends CI_Controller {
    
    function index() {
        $this->load->model('trydb');
        $data['rows'] = $this->trydb->getAll();
        
        $this->load->view('try', $data);
    }
    
}
?>

Default controller

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

class Welcome extends CI_Controller {

    public function index()
    {
        $this->load->view('welcome_message');
    }
    public function tryagain(){
        
     $this->load->view('try');   
    }
}

Why has you put foreach loop in model? you can use this:

function getAll() {
        $q = $this->db->get('user');
        $data = $q->result();
        return $data;
        }

and as suggested by DS9 , use below in view files.

if(isset($rows) && sizeof($rows)>0)
{
    foreach($rows as $r)
   {
   }
}