XML_Serializer::_serializeObject PHP Method

    function _serializeObject(&$object, $tagName = null, $attributes = array())
    {
        // check for magic function
        if (method_exists($object, '__sleep')) {
            $propNames = $object->__sleep();
            if (is_array($propNames)) {
                $properties = array();
                foreach ($propNames as $propName) {
                    $properties[$propName] = $object->{$propName};
                }
            } else {
                $properties = get_object_vars($object);
            }
        } else {
            $properties = get_object_vars($object);
        }
        if (empty($tagName)) {
            $tagName = get_class($object);
        }
        // typehints activated?
        if ($this->options[XML_SERIALIZER_OPTION_TYPEHINTS] === true) {
            $attributes[$this->options[XML_SERIALIZER_OPTION_ATTRIBUTE_TYPE]] = 'object';
            $attributes[$this->options[XML_SERIALIZER_OPTION_ATTRIBUTE_CLASS]] = get_class($object);
        }
        $string = $this->_serializeArray($properties, $tagName, $attributes);
        return $string;
    }