DB Update with multiple inputs in a loop

[eluser]Ludovic-r[/eluser]
Hi, thanks for your answer but I can't achieve that I don't know why, here's my form :

Code:

echo form_open('admin/update_categories/');
    
    if (isset($result)) {

        foreach ($result as $row) {

        echo form_input('category_name',$row->category_name);

        }
    } else { echo 'no categories'; }

    echo form_submit('','Save');

    echo form_close();