$dom = new DomDocument('1.0', 'UTF-8');

        $root = $dom->createElement('winstrom');
        $root->setAttribute("version","1.0");
        $dom->appendChild($root);

        $root2 = $dom->createElement("main_tag"); 
        $root->appendChild($root2);

        $item = $dom->createElement('child_tag');
        $root2->appendChild($item);

        $text = $dom->createTextNode('example');
        $item->appendChild($text);

        $dom->formatOutput = true;
        echo $dom->saveXML();