SimplePie::get_permalink PHP Method

    public function get_permalink()
    {
        return $this->get_link(0);
    }

 /**
  * Render a newsletter
  * @return string the newsletter.
  */
 public function make()
 {
     $module = Yii::app()->controller->module;
     require_once 'protected/vendors/simplepie/autoloader.php';
     require_once 'protected/vendors/simplepie/idn/idna_convert.class.php';
     $timeLimit = KeyValue::model()->findByPk('newsletter_execution_time')->value;
     $simplePie = new SimplePie();
     $simplePie->set_cache_location('./protected/cache/simplepie');
     $simplePie->set_cache_duration(1);
     // 1 seconde
     // This makes sure that the content is sent to the browser as
     // text/html and the UTF-8 character set (since we didn't change it).
     $simplePie->handle_content_type();
     if ($module->multiLang) {
         if (isset($this->language)) {
             $feeds = $module->feeds[$this->language];
             $renderLanguage = $this->language;
         } else {
             $feeds = $module->feeds[Yii::app()->language];
             $renderLanguage = Yii::app()->language;
         }
     } else {
         $feeds = $module->feeds;
         $renderLanguage = Yii::app()->language;
     }
     $atLeastOne = false;
     for ($i = 0; $i < count($feeds); $i++) {
         if (isset($feeds[$i]['expression'])) {
             $feeds[$i]['content'] = $this->evaluateExpression($feeds[$i]['expression'], array('timeLimit' => $timeLimit, 'language' => $renderLanguage));
             if ($feeds[$i]['content'] != '') {
                 $atLeastOne = true;
             }
         } else {
             $simplePie->set_feed_url($feeds[$i]['url']);
             $simplePie->init();
             $feeds[$i]['link'] = $simplePie->get_permalink();
             $feeds[$i]['items'] = array();
             foreach ($simplePie->get_items(0, $feeds[$i]['limit']) as $item) {
                 if ($item->get_date('U') > strtotime($timeLimit)) {
                     $feeds[$i]['items'][] = $item;
                     $atLeastOne = true;
                 }
             }
         }
     }
     if ($atLeastOne) {
         return Yii::app()->controller->renderPartial('newsletter.components.views.newsletter', array('feeds' => $feeds, 'language' => $renderLanguage), true);
     } else {
         return false;
     }
 }