SimplePie::set_feed_url PHP Method

    public function set_feed_url($url)
    {
        $this->multifeed_url = array();
        if (is_array($url)) {
            foreach ($url as $value) {
                $this->multifeed_url[] = $this->registry->call('Misc', 'fix_protocol', array($value, 1));
            }
        } else {
            $this->feed_url = $this->registry->call('Misc', 'fix_protocol', array($url, 1));
            $this->permanent_url = $this->feed_url;
        }
    }

 /**
  * Display a wildcard in the back end
  *
  * @return string
  */
 public function generate()
 {
     if (TL_MODE == 'BE') {
         /** @var \BackendTemplate|object $objTemplate */
         $objTemplate = new \BackendTemplate('be_wildcard');
         $objTemplate->wildcard = '### ' . utf8_strtoupper($GLOBALS['TL_LANG']['FMD']['rss_reader'][0]) . ' ###';
         $objTemplate->title = $this->headline;
         $objTemplate->id = $this->id;
         $objTemplate->link = $this->name;
         $objTemplate->href = '' . $GLOBALS['TL_CONFIG']['backendPath'] . '/main.php?do=themes&table=tl_module&act=edit&id=' . $this->id;
         return $objTemplate->parse();
     }
     $this->objFeed = new \SimplePie();
     $arrUrls = trimsplit('[\\n\\t ]', trim($this->rss_feed));
     if (count($arrUrls) > 1) {
         $this->objFeed->set_feed_url($arrUrls);
     } else {
         $this->objFeed->set_feed_url($arrUrls[0]);
     }
     $this->objFeed->set_output_encoding(\Config::get('characterSet'));
     $this->objFeed->set_cache_location(TL_ROOT . '/system/tmp');
     $this->objFeed->enable_cache(false);
     if ($this->rss_cache > 0) {
         $this->objFeed->enable_cache(true);
         $this->objFeed->set_cache_duration($this->rss_cache);
     }
     if (!$this->objFeed->init()) {
         $this->log('Error importing RSS feed "' . $this->rss_feed . '"', __METHOD__, TL_ERROR);
         return '';
     }
     $this->objFeed->handle_content_type();
     return parent::generate();
 }