Validating customfields

[byon]

Hi

I've got a question here, how do i validate custom field data before it get's updated into the database?

This is found inside, profile.php

PHP Code:

        // easy stuff

        $userdata->set('birthday', $vbulletin->GPC);
        $userdata->set('showbirthday', $vbulletin->GPC['showbirthday']);

// how should i add my validators here making sure that it matches the records i want to match? 

        // custom profile fields
        $userdata->set_userfields($vbulletin->GPC['userfield']); 


please guide me on track!

thanks.



Forget about this thread, i solved it.
worked on profile.php directly and manage to do what i need.

Here's the code if anybody needs it infuture.

PHP Code:

        /*
        # Modification
        */
        require_once(DIR . '/includes/functions_bx_kky.php');

        // validate registered key
        $bx_kky = $vbulletin->GPC['userfield']['field8'];
        if (!empty($bx_kky)) {
                if (!validate_username($username)) {
                        eval(standard_error(fetch_error('invalid_username')));
                        $tb_regkey = '';
                }
                $vbulletin->GPC['userfield']['field8'] = $bx_kky;
        }
        /*
        # End of Modification
        */ 


ignore my variable namings here, cuz i purposely messed it up.