NFePHP\NFe\ToolsNFe::zAddProtMsg PHP Method

    protected function zAddProtMsg($tagproc, $tagmsg, $xmlmsg, $tagretorno, $xmlretorno)
    {
        $doc = new Dom();
        $doc->loadXMLString($xmlmsg);
        $nodedoc = $doc->getNode($tagmsg, 0);
        $procver = $nodedoc->getAttribute("versao");
        $procns = $nodedoc->getAttribute("xmlns");
        $doc1 = new Dom();
        $doc1->loadXMLString($xmlretorno);
        $nodedoc1 = $doc1->getNode($tagretorno, 0);
        $proc = new \DOMDocument('1.0', 'utf-8');
        $proc->formatOutput = false;
        $proc->preserveWhiteSpace = false;
        //cria a tag nfeProc
        $procNode = $proc->createElement($tagproc);
        $proc->appendChild($procNode);
        //estabele o atributo de versão
        $procNodeAtt1 = $procNode->appendChild($proc->createAttribute('versao'));
        $procNodeAtt1->appendChild($proc->createTextNode($procver));
        //estabelece o atributo xmlns
        $procNodeAtt2 = $procNode->appendChild($proc->createAttribute('xmlns'));
        $procNodeAtt2->appendChild($proc->createTextNode($procns));
        //inclui a tag inutNFe
        $node = $proc->importNode($nodedoc, true);
        $procNode->appendChild($node);
        //inclui a tag retInutNFe
        $node = $proc->importNode($nodedoc1, true);
        $procNode->appendChild($node);
        //salva o xml como string em uma variável
        $procXML = $proc->saveXML();
        //remove as informações indesejadas
        $procXML = Strings::clearProt($procXML);
        return $procXML;
    }