SimplePie_Exception example

        else
        {
            return false;
        }
    }

    public function get_base()
    {
        if ($this->dom === null)
        {
            throw new SimplePie_Exception('DOMDocument not found, unable to use locator');
        }
        $this->http_base = $this->file->url;
        $this->base = $this->http_base;
        $elements = $this->dom->getElementsByTagName('base');
        foreach ($elements as $element)
        {
            if ($element->hasAttribute('href'))
            {
                $base = $this->registry->call('Misc', 'absolutize_url', array(trim($element->getAttribute('href')), $this->http_base));
                if ($base === false)
                {
                    

if ($type & SIMPLEPIE_CONSTRUCT_BASE64)
            {
                $data = base64_decode($data);
            }

            if ($type & (SIMPLEPIE_CONSTRUCT_HTML | SIMPLEPIE_CONSTRUCT_XHTML))
            {

                if (!class_exists('DOMDocument'))
                {
                    throw new SimplePie_Exception('DOMDocument not found, unable to use sanitizer');
                }
                $document = new DOMDocument();
                $document->encoding = 'UTF-8';

                $data = $this->preprocess($data, $type);

                set_error_handler(array('SimplePie_Misc', 'silence_errors'));
                $document->loadHTML($data);
                restore_error_handler();

                $xpath = new DOMXPath($document);