QueryPath\DOMQuery::parseXMLString PHP Method

    private function parseXMLString($string, $flags = null)
    {
        $document = new \DOMDocument('1.0');
        $lead = strtolower(substr($string, 0, 5));
        // <?xml
        try {
            set_error_handler(array('\\QueryPath\\ParseException', 'initializeFromError'), $this->errTypes);
            if (isset($this->options['convert_to_encoding'])) {
                // Is there another way to do this?
                $from_enc = isset($this->options['convert_from_encoding']) ? $this->options['convert_from_encoding'] : 'auto';
                $to_enc = $this->options['convert_to_encoding'];
                if (function_exists('mb_convert_encoding')) {
                    $string = mb_convert_encoding($string, $to_enc, $from_enc);
                }
            }
            // This is to avoid cases where low ascii digits have slipped into HTML.
            // AFAIK, it should not adversly effect UTF-8 documents.
            if (!empty($this->options['strip_low_ascii'])) {
                $string = filter_var($string, FILTER_UNSAFE_RAW, FILTER_FLAG_ENCODE_LOW);
            }
            // Allow users to override parser settings.
            if (empty($this->options['use_parser'])) {
                $useParser = '';
            } else {
                $useParser = strtolower($this->options['use_parser']);
            }
            // If HTML parser is requested, we use it.
            if ($useParser == 'html') {
                $document->loadHTML($string);
            } elseif ($lead == '<?xml' || $useParser == 'xml') {
                if ($this->options['replace_entities']) {
                    $string = \QueryPath\Entities::replaceAllEntities($string);
                }
                $document->loadXML($string, $flags);
            } else {
                $document->loadHTML($string);
            }
        } catch (Exception $e) {
            restore_error_handler();
            throw $e;
        }
        restore_error_handler();
        if (empty($document)) {
            throw new \QueryPath\ParseException('Unknown parser exception.');
        }
        return $document;
    }