setting the $field variable in a custom callback

[eluser]Bramme[/eluser]
I just can't figure it out why it's not working.

When I do

Code:

$array = func_get_args();
            print_r($array);

in my callback function (in my controller), I get this:

Code:

Array
(
    [0] =>
    [1] =>
)

So two params ARE being sent to the function (even when I changed the function to function _file_selected($str) {}), but they're both empty. This is mind boggling.

More mind boggling stuff: I only get the empty array at the beginning of my html when I ONLY set the callback in the rules, the moment I use "required" too, it won't print the array anymore.