[eluser]tpetrone[/eluser]
I don't think you should be using the validation functions as a way to "set" data if a NULL condition is detected.
Validation is just testing the current values against a set of rules..
If you need to modify the $_POST/$this->input->post data, either do it before you validate or after you validate.
IF your going to use a callback in your validation then the callback should probably return either a TRUE/FALSE response.
Code:
function validateValue($value){
if(empty($value) || is_null($value)){
$this->form_validation->set_message('some_value', 'This field cannot be empty');
return(FALSE); // The value is NULL
}else{
return(TRUE);
}
}
