SimplePie::strip_htmltags PHP Method

    public function strip_htmltags($tags = '', $encode = null)
    {
        if ($tags === '') {
            $tags = $this->strip_htmltags;
        }
        $this->sanitize->strip_htmltags($tags);
        if ($encode !== null) {
            $this->sanitize->encode_instead_of_strip($tags);
        }
    }

function list_posts($cfg)
{
    require_once 'inc/simplepie.inc';
    $feed = new SimplePie();
    // Set which feed to process.
    // handle the different feeds
    // blogging
    if ($cfg['tumblr'] != "") {
        $feeds[] = 'http://' . $cfg['tumblr'] . '.tumblr.com/rss';
    }
    if ($cfg['blogger'] != "") {
        $feeds[] = 'http://' . $cfg['blogger'] . '.blogspot.com/feeds/posts/default?alt=rss';
    }
    if ($cfg['medium'] != "") {
        $feeds[] = 'https://medium.com/feed/@' . $cfg['medium'] . '/';
    }
    if ($cfg['ghost'] != "") {
        $feeds[] = 'http://' . $cfg['ghost'] . '.ghost.io/rss/';
    }
    if ($cfg['postachio'] != "") {
        $feeds[] = 'http://' . $cfg['postachio'] . '.postach.io/feed.xml';
    }
    if ($cfg['custom'] != "") {
        $feeds[] = $cfg['custom'];
    }
    // plugins
    if (file_exists('plugins')) {
        $plugins = listFiles('plugins');
        if (count($plugins) > 0) {
            foreach ($plugins as $plugin) {
                $feeds[] = 'http://' . $_SERVER['SERVER_NAME'] . dirname($_SERVER['PHP_SELF']) . '/plugins/' . $plugin . '/index.php';
            }
        }
    }
    $feed->set_feed_url($feeds);
    // allow iframe embeds
    $strip_htmltags = $feed->strip_htmltags;
    array_splice($strip_htmltags, array_search('iframe', $strip_htmltags), 1);
    $feed->strip_htmltags($strip_htmltags);
    // Run SimplePie.
    $feed->init();
    // 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).
    $feed->handle_content_type();
    return $feed;
}