将节点分配给任意节点，如何使用Libxml2？ [英] Assigning a node to an arbitrary node, how to with Libxml2?

问题描述

此问题使用PHP，但问题和算法对许多其他 Libxml2和W3C DOM 实现有效。

This question use PHP, but the problems and algorithms are valid for many other Libxml2 and W3C DOM implementations.

核心问题：没有 $ node-&replaceThisBy（$ otherNode） 。只有替换文字（使用 nodeValue 属性）和 replaceChild（）方法—

Core problem: there are no $node->replaceThisBy($otherNode). There are only "replace text" (using nodeValue property) and the replaceChild() method — not obviuos neither simple to use.

在下面的代码中，仅第二个循环有效，但是我需要将节点从一棵DOM树（由克隆模拟）复制到另一棵

In the code below, only the second loop works, but I need copy nodes from one DOM tree (simulated by a clone) to another one.

$doc = new DOMDocument('1.0', 'UTF-8');
$doc->load($fileXML);
$xp = new DOMXpath($doc);
$lst = $xp->query("//td");

$z =  clone $lst->item(2);   // a big and complex node
         // needs clone to freeze the node content (before change it also). 
// does NOT work:
foreach ($lst as $node)
    $node = $z;  // no error messages!
    //error: $node->parentNode->replaceChild($z,$node);

// This works though:
foreach ($lst as $node)
    $node->nodeValue = $z->nodeValue;

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类似的问题：

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Similar questions:

• PHP DOM用新元素替换元素


• PHP DOMDocument问题：如何替换节点的文本？

• PHP DOM replace element with a new element
• PHP DOMDocument question: how to replace text of a node?

推荐答案

nodeValue 属性，仅更改文本值。要更改所有标签和内容，需要更多说明- DomDocument 不友好（！）...需要导入克隆，然后在循环中克隆：已解决！

nodeValue property, changes only text-value. To change all tags and contents, need a lot more instructions -- DomDocument is not friendly (!) ... Need to import a clone, and clone in the loop: solved!

  $doc = new DOMDocument('1.0', 'UTF-8');
  $doc->loadXML($xmlFrag);

  $xp = new DOMXpath($doc);
  $lst = $xp->query("//p");
  $import = $doc->importNode( $lst->item(1)->cloneNode(true) , TRUE);

  foreach ($lst as $node) {
    $tmp = clone $import; // clone because if same, ignores loop.
    $node->parentNode->replaceChild($tmp,$node);
  }
  print $doc->saveXML();

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