Method renderHeader

public function renderHeader($items, &$options)
{
    $o = array();
    if (!empty($items)) {
        foreach ($items as $k => $v) {
            $v = PhocacartText::parseDbColumnParameter($v);
            $o[] = $this->header($v, $options);
        }
    }
    return implode("\n", $o);
}