SimplePie::store_links PHP Method

    private function store_links(&$file, $hub, $self)
    {
        if (isset($file->headers['link']['hub']) || isset($file->headers['link']) && preg_match('/rel=hub/', $file->headers['link'])) {
            return;
        }
        if ($hub) {
            if (isset($file->headers['link'])) {
                if ($file->headers['link'] !== '') {
                    $file->headers['link'] = ', ';
                }
            } else {
                $file->headers['link'] = '';
            }
            $file->headers['link'] .= '<' . $hub . '>; rel=hub';
            if ($self) {
                $file->headers['link'] .= ', <' . $self . '>; rel=self';
            }
        }
    }