SimpleXML:将一棵树追加到另一棵树

本文介绍了SimpleXML:将一棵树追加到另一棵树的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我有两棵XML树，想将一棵树作为叶子添加到另一棵树上.

I have two XML trees and would like to add one tree as a leaf to the other one.

显然:

$tree2->addChild('leaf', $tree1);

不起作用，因为它仅复制第一个根节点.

doesn't work, as it copies only the first root node.

好的，所以我想我要遍历整个第一棵树，将每个元素一个接一个地添加到第二棵树上.

Ok, so then I thought I would traverse the whole first tree, adding every element one by one to the second one.

但是考虑这样的XML:

But consider XML like this:

<root> aaa <bbb/> ccc </root>

如何访问抄送"? tree1->children()仅返回"bbb"....

How do I access "ccc"? tree1->children() returns just "bbb"... .

推荐答案

如您所见，您不能直接使用SimpleXML添加树".但是，您可以使用某些DOM方法为您完成繁重的工作，同时仍在处理相同的基础XML.

You can't add a "tree" directly using SimpleXML, as you have seen. However, you can use some DOM methods to do the heavy lifting for you whilst still working on the same underlying XML.

$xmldict = new SimpleXMLElement('<dictionary><a/><b/><c/></dictionary>'); $kitty = new SimpleXMLElement('<cat><sound>meow</sound><texture>fuzzy</texture></cat>'); // Create new DOMElements from the two SimpleXMLElements $domdict = dom_import_simplexml($xmldict->c); $domcat = dom_import_simplexml($kitty); // Import the <cat> into the dictionary document $domcat = $domdict->ownerDocument->importNode($domcat, TRUE); // Append the <cat> to <c> in the dictionary $domdict->appendChild($domcat); // We can still use SimpleXML! (meow) echo $xmldict->c->cat->sound;