Miscellany

    function autodiscovery_all($local_only = true)
    {
        $feeds = array();

        // Is file already a feed ?
        if ($this->is_feed($this->file))
        {
            $feeds[] = $this->file->url;
            return $feeds;
        }

        // Search for feeds in <link> elements
        $links = SimplePie_Misc::get_element('link', $this->file->body());
        $done = array();

        foreach ($links as $link)
        {
            if (!empty($link['attribs']['TYPE']['data']) && !empty($link['attribs']['HREF']['data']))
            {
                $type = strtolower(trim($link['attribs']['TYPE']['data']));
                $href = SimplePie_Misc::absolutize_url(trim($link['attribs']['HREF']['data']), $this->file->url);
                if (!in_array($href, $done) && in_array($type, array('application/rss+xml', 'application/atom+xml', 'application/rdf+xml', 'application/xml+rss', 'application/xml+atom', 'application/xml+rdf', 'application/xml', 'application/x.atom+xml', 'text/xml')))
                {
                    $feed = $this->is_feed($href);
                    if ($feed)
                    {
                        $feeds[] = $href;
                    }
                }
                $done[] = $href;
            }
        }
        // Find links to feeds in <body>
        $this->useragent = $this->file->useragent;
        if ($this->get_links($this->file))
        {
            if (!empty($this->local))
            {
                foreach ($this->local as $key => $value)
                {
                    $value = SimplePie_Misc::absolutize_url($value, $this->file->url);
                    if (in_array(strrchr($value, '.'), array('.rss', '.rdf', '.atom', '.xml')))
                    {
                        if ($this->is_feed($value))
                        {
                            $feeds[] = $value;
                        }
                        else
                        {
                            unset($array[$key]);
                        }
                    }
                }

                foreach ($this->local as $key => $value)
                {
                    $value = SimplePie_Misc::absolutize_url($value, $this->file->url);
                    if (preg_match('/(rss|rdf|atom|xml)/i', $value))
                    {

                        if ($this->is_feed($value))
                        {
                            $feeds[] = $value;
                        }
                        else
                        {
                            unset($array[$key]);
                        }
                    }
                }
            }

            if (!empty($this->elsewhere) && $local_only == false)
            {
                foreach ($this->elsewhere as $key => $value)
                {
                    $value = SimplePie_Misc::absolutize_url($value, $this->file->url);
                    if (in_array(strrchr($value, '.'), array('.rss', '.rdf', '.atom', '.xml')))
                    {
                        if ($this->is_feed($value))
                        {
                            $feeds[] = $value;
                        }
                        else
                        {
                            unset($array[$key]);
                        }
                    }
                }

                foreach ($this->elsewhere as $key => $value)
                {
                    $value = SimplePie_Misc::absolutize_url($value, $this->file->url);
                    if (preg_match('/(rss|rdf|atom|xml)/i', $value))
                    {
                        if ($this->is_feed($value))
                        {
                            $feeds[] = $value;
                        }
                        else
                        {
                            unset($array[$key]);
                        }
                    }
                }
            }
        }

        if(!empty($feeds)) return array_unique($feeds);
        else return false;
    }