Jacwright\RestServer\RestServer::xml_encode PHP Method

    private function xml_encode($mixed, $domElement = null, $DOMDocument = null)
    {
        //@todo add type hint for $domElement and $DOMDocument
        if (is_null($DOMDocument)) {
            $DOMDocument = new DOMDocument();
            $DOMDocument->formatOutput = true;
            $this->xml_encode($mixed, $DOMDocument, $DOMDocument);
            echo $DOMDocument->saveXML();
        } else {
            if (is_array($mixed)) {
                foreach ($mixed as $index => $mixedElement) {
                    if (is_int($index)) {
                        if ($index === 0) {
                            $node = $domElement;
                        } else {
                            $node = $DOMDocument->createElement($domElement->tagName);
                            $domElement->parentNode->appendChild($node);
                        }
                    } else {
                        $plural = $DOMDocument->createElement($index);
                        $domElement->appendChild($plural);
                        $node = $plural;
                        if (!(rtrim($index, 's') === $index)) {
                            $singular = $DOMDocument->createElement(rtrim($index, 's'));
                            $plural->appendChild($singular);
                            $node = $singular;
                        }
                    }
                    $this->xml_encode($mixedElement, $node, $DOMDocument);
                }
            } else {
                $domElement->appendChild($DOMDocument->createTextNode($mixed));
            }
        }
    }