how to use form validation to compare date? - if not possible accept a parallel solution.

[eluser]Spectruman[/eluser]
[quote author="Kamarg" date="1271455255"]Callback functions as explained in the user guide seem to be just what you're looking for.[/quote]

understand the function, the problem is how to pass all parameters to the function you want. For the tutorial I call only for item validation. as in the example:

Code:

$ this-> form_validation->set_rules('username', 'Username', 'callback_username_check');
I can not use this scheme

Code:

$ This-> form_validation->set_rules('dateStart', 'Start Date', 'trim|required|callback_compareDataTime');
$ This-> form_validation->set_rules('dateEnd', 'Date endFim', 'trim |required|callback_compareDataTime');
$ This-> form_validation->set_rules('timeStart', 'Start Time', 'trim|required|callback_compareDataTime');
$ This-> form_validation->set_rules('timeEnd', 'End Time', 'trim|required|callback_compareDataTime');

so I'll just grab a parameter. I need to pass all the parameters of the function to test and return the message according to the function's return