FOF30\Form\Header\HeaderBase::getSortable PHP Метод

    protected function getSortable()
    {
        $sortable = $this->element['sortable'] != 'false';
        if ($sortable) {
            if (empty($this->header)) {
                $this->header = $this->onlyFilter ? '' : $this->getHeader();
            }
            $sortable = !empty($this->header);
        }
        return $sortable;
    }