SimplePie::get_item PHP Method

    public function get_item($key = 0)
    {
        $items = $this->get_items();
        if (isset($items[$key])) {
            return $items[$key];
        } else {
            return null;
        }
    }

 public function respond()
 {
     $url = trim($this->matches[1]);
     $index = 0;
     if (isset($this->matches[2])) {
         $index = intval(trim($this->matches[2]));
         $index = $index - 1;
         $index = max(0, $index);
     }
     $error_level = error_reporting();
     error_reporting($error_level ^ E_USER_NOTICE);
     $feed = new \SimplePie();
     if ($this->cacheEnabled()) {
         $feed->set_cache_location($this->config['cache_directory']);
         $feed->set_cache_duration(600);
     }
     $feed->set_feed_url($url);
     $feed->init();
     $feed->handle_content_type();
     if ($index > $feed->get_item_quantity() - 1) {
         $index = $feed->get_item_quantity() - 1;
     }
     $item = $feed->get_item($index);
     $result = null;
     if ($item) {
         $title = html_entity_decode($item->get_title());
         $link = $item->get_permalink();
         $date = $item->get_date();
         $i = $index + 1;
         $result = "[{$i}] {$date} - {$title} - {$link}";
     }
     error_reporting($error_level);
     return $result;
 }