update profile builder extra fields dynamically.

gistfile1.txt

$pb_options = get_option('wppb_custom_fields');

if (is_array($pb_options)){
  foreach ($pb_options as $key => $single_option){
		if ( $single_option['item_metaName'] == 'custom_field_1' )
			$pb_options[$key]['item_options'] = 'Unu,Doi,Trei';
	}
}
update_option('wppb_custom_fields', $pb_options);