用DOMDocument在XML中追加QBXML声明

Question

试图使用QuickBooks中的DOMDocument为DOMDocument集成编写干净的XML。我唯一坚持的是如何在<?qbxml version="2.0"?>之后添加所需的<?xml version="1.0" encoding="utf-8"?>，以生成以下内容：

<?xml version="1.0" encoding="utf-8"?>
        <?qbxml version="2.0"?>
.....

这是我目前所拥有的..。

$dom = new DOMDocument('1.0', 'utf-8');
   //Need to somehow add qbxml version here
    $qbxml = $dom->appendChild($dom->createElement('QBXML'));
    $qbxmlmsg = $qbxml->appendChild($dom->createElement('QBXMLMsgsRq'));
    $qbxmlmsg->setAttribute('onError', 'stopOnError');
    $salesReceiptAddRq = $qbxmlmsg->appendChild($dom->createElement('SalesReceiptAddRq'));
    $salesReceiptAddRq->setAttribute('requestID', 1234);
$dom->formatOutput = true;
    echo $dom->saveXML();

Answer 1

该节点称为处理指令。

$dom = new DOMDocument('1.0', 'utf-8');
$dom->appendChild($dom->createProcessingInstruction('qbxml', 'version="2.0"'));
$qbxml = $dom->appendChild($dom->createElement('QBXML'));
// ...

echo $dom->saveXml();