unsetTraverser example

 else {
            $stream = fopen($file, 'wb');
        }
        $options = array_merge($this->defaultOptions, $options);
        $rules = new OutputRules($stream, $options);
        $trav = new Traverser($dom, $stream, $rules, $options);

        $trav->walk();
        /* * release the traverser to avoid cyclic references and allow PHP to free memory without waiting for gc_collect_cycles */
        $rules->unsetTraverser();
        if ($close) {
            fclose($stream);
        }
    }

    /** * Convert a DOM into an HTML5 string. * * @param mixed $dom The DOM to be serialized. * @param array $options Configuration options when serializing the DOM. These include: * - encode_entities: Text written to the output is escaped by default and not all * entities are encoded. If this is set to true all entities will be encoded. * Defaults to false. * * @return string A HTML5 documented generated from the DOM. */