PHP中的XML克隆节点

Question

I have to clone an XML node and its childs and append it to a new XML in a specifics tag.

Ie:

Source XML:

<root>
  <element>
    <back>
    <item1>ABC</item1>
    <item2>DEF</item2>
    <more>
      <moreitem>GHI</moreitem>
    </more
    </back>
  </element>
</root>

Destination XML:

<root>
  <base1>
    <item1>FOO</item1>
    <item2>BAR</item2>
  <base2>
    **<back>From source XML and all its childs here</back>**
  </base2>
  </base1>
<root>

Answer 1

DOMXpath::evaluate() allows you to fetch nodes using Xpath expressions. DOMDocument::importNode() duplicates a node and imports a node into a target document. DOMNode::cloneNode() create a duplicate of node to add in the same document. DOMNode::appendChild() allows you to append the imported/cloned node.

$source = <<<'XML'
<root>
  <element>
    <back>
    <item1>ABC</item1>
    <item2>DEF</item2>
    <more>
      <moreitem>GHI</moreitem>
    </more>
    </back>
  </element>
</root>
XML;

$target = <<<'XML'
<root>
  <base1>
    <item1>FOO</item1>
    <item2>BAR</item2>
    <base2>
    </base2>
  </base1>
</root>
XML;

$sourceDocument = new DOMDocument();
$sourceDocument->loadXml($source);
$sourceXpath = new DOMXpath($sourceDocument);

$targetDocument = new DOMDocument();
$targetDocument->loadXml($target);
$targetXpath = new DOMXpath($targetDocument);

foreach ($targetXpath->evaluate('/root/base1/base2[1]') as $targetNode) {
  foreach ($sourceXpath->evaluate('/root/element/back') as $backNode) {
    $targetNode->appendChild($targetDocument->importNode($backNode, TRUE));
  }
}

echo $targetDocument->saveXml();

Output:

<?xml version="1.0"?>
<root>
  <base1>
    <item1>FOO</item1>
    <item2>BAR</item2>
    <base2>
      <back>
        <item1>ABC</item1>
        <item2>DEF</item2>
        <more>
          <moreitem>GHI</moreitem>
        </more>
      </back>
    </base2>
  </base1>
</root>