Method external_link2Header

public function external_link2Header(&$options)
{
    $data = array('class' => 'ph-upc', 'title' => 'COM_PHOCACART_FIELD_EXTERNAL_LINK_2_LABEL', 'tool' => 'searchtools.sort', 'column' => 'a.external_link2');
    return $this->renderHeaderColumn($data, $options);
}