cloneNode + appendChild + insertBefore dom xml php

Question

我有一个xml，我将克隆父亲，并在克隆的节点下离开。更多的是给出这个错误。我想知道为什么

致命错误:第32行对C:\xampp\htdocs\xml2\cloneNew.php中的非对象调用成员函数insertBefore()

$xmla = <<<XML
<?xml version="1.0" ?>
<library>
  <book isbn="1001" pubdate="1943-01-01">
    <title><![CDATA[The Fountainhead]]></title>
    <author>Ayn Rand</author>
    <price>300</price>
  </book>
  <book isbn="1002" pubdate="1954-01-01">
    <title><![CDATA[The Lord of the Rings]]></title>
    <author>J.R.R.Tolkein</author>
    <price>500</price>
  </book>
  <book isbn="1006" pubdate="1982-01-01">
    <title><![CDATA[The Dark - Tower San]]></title>
    <author>Stephen King</author>
    <price>200</price>
  </book>
</library>
XML;

$xmlb = <<<XML
<?xml version="1.0" ?>
<library>
  <book isbn="1004" pubdate="1943-01-01">
    <title><![CDATA[The Fountainhead]]></title>
    <author>Ayn Rand</author>
    <price>300</price>
  </book>
</library>
XML;
$dom_01 = new DOMDocument();
$dom_01->loadXML($xmla);
$library_01 = $dom_01->documentElement;

$dom_02 = new DOMDocument();
$dom_02->loadXML($xmlb);
$library_02 = $dom_02->documentElement;

$xpath = new DOMXPath($dom_02);
$result = $xpath->query('/library/book[translate(@pubdate,"-","")>translate("1980-01-01","-","")]');

$library_02 = $library_02->cloneNode(true);
$newElement = $library_01->appendChild($result->item(0));
$library_01->parentNode->insertBefore($newElement, $result->item(0));

header("Content-type: text/xml");
echo $dom->saveXML();


Result:

$xmla = <<<XML
<?xml version="1.0" ?>
<library>
  <book isbn="1001" pubdate="1943-01-01">
    <title><![CDATA[The Fountainhead]]></title>
    <author>Ayn Rand</author>
    <price>300</price>
  </book>
  <book isbn="1002" pubdate="1954-01-01">
    <title><![CDATA[The Lord of the Rings]]></title>
    <author>J.R.R.Tolkein</author>
    <price>500</price>
  </book>
  <book isbn="1004" pubdate="1943-01-01">
    <title><![CDATA[The Fountainhead]]></title>
    <author>Ayn Rand</author>
    <price>300</price>
  </book>
  <book isbn="1006" pubdate="1982-01-01">
    <title><![CDATA[The Dark - Tower San]]></title>
    <author>Stephen King</author>
    <price>200</price>
  </book>
</library>
XML;

Answer 1

您正在尝试获取documentElement的parentNode不存在此类节点。

另外，如果希望将一个文档中的节点放到另一个文档中，请使用DOMDocument.importNode而不是cloneNode。