merging into the gpc array

[Nullifi3d]

I am trying to update two custom fields in the user table when profile data is updated (profile_updateprofile). I want to clean the posted textbox inputs before inserting into the database.

I have in userdata_start:

PHP Code:

$this->validfields['homepagetitle'] = array(TYPE_STR, REQ_NO);
$this->validfields['homepagedesc'] = array(TYPE_STR, REQ_NO); 


And in profile_updateprofile:

PHP Code:

$vbulletin->input->clean_array_gpc('p', array(
    'homepagetitle'    => TYPE_STR,
    'homepagedesc'  => TYPE_STR,
));
$userdata->set('homepagetitle', $vbulletin->GPC['homepagetitle']);
$userdata->set('homepagedesc', $vbulletin->GPC['homepagedesc']); 


However, this (obviously) erases the GPC variables already set (other profile info).