Method getSortFields

public function getSortFields($items, &$options)
{
    $o = array();
    if (!empty($items)) {
        foreach ($items as $k => $v) {
            $v = PhocacartText::parseDbColumnParameter($v);
            $data = $this->header($v, $options);
            if (isset($data['column']) && $data['column'] != '') {
                $id = $data['column'];
                $o[$id] = Text::_($data['title']);
            }
        }
    }
    return $o;
}