GroceryCrud + CodeIgniter change value inside field

I'm using GroceryCrud for save data. User register is from website itself. When select their sex, i'm saving 1 for male, 2 for female. Database field is tinyint. So problem is, when admin view their data from backend, it's obvious 1 or 2 will appear on Sex field. How to change it into male, female depending on value?

You can use the callback_column for this.

In your case you can do:

public function webpages()
{
  $c = new grocery_CRUD();

  $c->set_table('users');
  $c->columns('firstname','lastname','sex','age');

  $c->callback_column('sex',array($this,'_callback_sex'));

  $output = $c->render();
  $this->_view_output($output);
}

public function _callback_sex($value, $row)
{
    if ($value == '2') {
        return 'male'
    } elseif ($value == '1') {
        return 'female';
    } else {
        return "-";
    }
}