如何将XML字符串附加到DOMDocument对象中？

问题描述

创建DOMDocument对象：

Creating the DOMDocument object:

$getToken = '<getToken>...</getToken>';
$getToken_objeto = new DOMDocument("1.0", "UTF-8");
$getToken_objeto -> loadXML($getToken);

尝试将XML字符串（签名）附加到上面创建的DOMDocument中：

Trying to append a XML string (Signature) into the DOMDocument created above:

$Signature = '<Signature>...</Signature>';
$Signature_objeto = new DOMDocument("1.0", "UTF-8");
$Signature_objeto -> loadXML($Signature);
$Signature_nodeList = $Signature_objeto -> getElementsByTagName("Signature");
$Signature_node = $Signature_nodeList -> item(0);
$getToken_objeto -> importNode($Signature_node, true);
$getToken_objeto -> appendChild($Signature_node);

我遇到2个错误：

致命错误：C中出现未捕获的异常 DOMException，消息为错误的文档错误：...
DOMException：C中出现了错误的文档错误：...

Fatal error: Uncaught exception 'DOMException' with message 'Wrong Document Error' in C:...DOMException: Wrong Document Error in C:...

似乎很容易解决，但是使用PHP DOM扩展却没有经验。

Seems simple to resolve but im quite unexperienced using the PHP DOM extension.

预先感谢。

推荐答案

您正在尝试附加原始节点-而不是导入的节点。

You're trying to append the original node - not the imported one.

$Signature_node = $getToken_objeto->importNode(
  $Signature_nodeList->item(0), true
);

您试图将节点附加到文档中，但是XML文档只能有一个文档元素，并且已经有一个。您可以将其附加到文档元素：

You're trying to append the node to the document, but an XML document can only have a single document element and it already has one. You can append it to the document element:

$getToken_objeto->documentElement->appendChild($Signature_node);

但是PHP可以将XML片段直接加载到DOMDocumentFragment中。

But PHP can load XML fragments directly into a DOMDocumentFragment.

$xml = '<getToken>...</getToken>';
$fragmentXml = '<Signature>...</Signature>';

$dom = new DOMDocument();
$dom->loadXML($xml);
$xpath = new DOMXpath($dom);

$fragment = $dom->createDocumentFragment();
$fragment->appendXml($fragmentXml);

$xpath
  ->evaluate('//getToken')
  ->item(0)
  ->appendChild($fragment);

echo $dom->saveXml();

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