Form validation callback return value

[eluser]mr lister[/eluser]
I think you are misunderstanding the documentation.

In your callback function, carry out what ever conditional statements you need on the POSTed data, then return the boolean result as either TRUE/FALSE depending on the result.

I agree with adityamenon, the form validation / callback function will not change your POSTed form data, you are only validating the form data based on set criteria.

The example:

Code:

if ($str == 'test')
{
$this->form_validation->set_message('username_check', 'The %s field can not be the word "test"');
return FALSE;
}
else
{
return TRUE;
}

will return - set the message - text as part of your validation for the field that called the function.

The documentation gives the above example, as Eric pointed out with the user guide link.