if ($_POST['do'] == 'updateprofile') { $vbulletin->input->clean_gpc('p', 'userfield', TYPE_ARRAY); $fieldcontentbefore = array( 'aaa', 'ccc' ); $fieldcontentafter = array( 'bbb', 'ddd' ); $vbulletin->GPC['userfield'][$field] = str_replace($fieldcontentbefore, $fieldcontentafter, $vbulletin->GPC['userfield'][$field]); }