ActiveResource\ActiveResource::_build_xml PHP Метод

    public function _build_xml($k, $v)
    {
        if (is_object($v) && strtolower(get_class($v)) == 'simplexmlelement') {
            return preg_replace('/<\\?xml(.*?)\\?>\\n*/', '', $v->asXML());
        }
        $res = '';
        $attrs = '';
        if (!is_numeric($k)) {
            $res = '<' . $k . '{{attributes}}>';
        }
        if (is_object($v)) {
            $v = (array) $v;
        }
        if (is_array($v)) {
            foreach ($v as $key => $value) {
                // handle attributes of repeating tags
                if (is_numeric($key) && is_array($value)) {
                    foreach ($value as $sub_key => $sub_value) {
                        if (strpos($sub_key, '@') === 0) {
                            $attrs .= ' ' . substr($sub_key, 1) . '="' . $this->_xml_entities($sub_value) . '"';
                            unset($value[$sub_key]);
                            continue;
                        }
                    }
                }
                if (strpos($key, '@') === 0) {
                    $attrs .= ' ' . substr($key, 1) . '="' . $this->_xml_entities($value) . '"';
                    continue;
                }
                $res .= $this->_build_xml($key, $value);
                $keys = array_keys($v);
                if (is_numeric($key) && $key !== array_pop($keys)) {
                    // reset attributes on repeating tags
                    if (is_array($value)) {
                        $res = str_replace('<' . $k . '{{attributes}}>', '<' . $k . $attrs . '>', $res);
                        $attrs = '';
                    }
                    $res .= '</' . $k . ">\n<" . $k . '{{attributes}}>';
                }
            }
        } else {
            $res .= $this->_xml_entities($v);
        }
        if (!is_numeric($k)) {
            $res .= '</' . $k . ">\n";
        }
        $res = str_replace('<' . $k . '{{attributes}}>', '<' . $k . $attrs . '>', $res);
        return $res;
    }