SimplePie_Misc::parse_mime PHP Method

    function parse_mime($mime)
    {
        if (($pos = strpos($mime, ';')) === false) {
            return trim($mime);
        } else {
            return trim(substr($mime, 0, $pos));
        }
    }

 function autodiscovery()
 {
     $links = array_merge(SimplePie_Misc::get_element('link', $this->file->body), SimplePie_Misc::get_element('a', $this->file->body), SimplePie_Misc::get_element('area', $this->file->body));
     $done = array();
     foreach ($links as $link) {
         if ($this->checked_feeds == $this->max_checked_feeds) {
             break;
         }
         if (isset($link['attribs']['href']['data']) && isset($link['attribs']['rel']['data'])) {
             $rel = array_unique(SimplePie_Misc::space_seperated_tokens(strtolower($link['attribs']['rel']['data'])));
             if ($this->base_location < $link['offset']) {
                 $href = SimplePie_Misc::absolutize_url(trim($link['attribs']['href']['data']), $this->base);
             } else {
                 $href = SimplePie_Misc::absolutize_url(trim($link['attribs']['href']['data']), $this->http_base);
             }
             if (!in_array($href, $done) && in_array('feed', $rel) || in_array('alternate', $rel) && !empty($link['attribs']['type']['data']) && in_array(strtolower(SimplePie_Misc::parse_mime($link['attribs']['type']['data'])), array('application/rss+xml', 'application/atom+xml'))) {
                 $this->checked_feeds++;
                 $feed =& new $this->file_class($href, $this->timeout, 5, null, $this->useragent);
                 if ($this->is_feed($feed)) {
                     return $feed;
                 }
             }
             $done[] = $href;
         }
     }
     return null;
 }