PHP domDocument删除子节点的子节点

Question

如何删除子节点的父节点，但保留所有子节点？

XML文件是这样的：

<?xml version='1.0'?> 
<products> 
<product> 
<ItemId>531<ItemId> 
<modelNumber>00000</modelNumber> 
<categoryPath> 
<category><name>Category A</name></category> 
<category><name>Category B</name></category> 
<category><name>Category C</name></category> 
<category><name>Category D</name></category> 
<category><name>Category E</name></category> 
</categoryPath> 
</product> 
</products> 

基本上，我需要删除categoryPath节点和类别节点，但把所有的名字节点的产品节点的内部。我的目标是这样一个文件：

<?xml version='1.0'?> 
<products> 
<product> 
<ItemId>531<ItemId> 
<modelNumber>00000</modelNumber> 
<name>Category A</name> 
<name>Category B</name> 
<name>Category C</name> 
<name>Category D</name> 
<name>Category E</name> 
</product> 
</products> 

是否有PHP内置函数来做到这一点？任何指针将不胜感激，我只是不知道从哪里开始，因为有许多子节点。

感谢

Answer 1

一个好的方法来处理XML数据是使用DOM设施。

一旦你介绍它就很容易。例如：

<?php 

// load up your XML 
$xml = new DOMDocument; 
$xml->load('input.xml'); 

// Find all elements you want to replace. Since your data is really simple, 
// you can do this without much ado. Otherwise you could read up on XPath. 
// See http://www.php.net/manual/en/class.domxpath.php 
$elements = $xml->getElementsByTagName('category'); 

// WARNING: $elements is a "live" list -- it's going to reflect the structure 
// of the document even as we are modifying it! For this reason, it's 
// important to write the loop in a way that makes it work correctly in the 
// presence of such "live updates". 
while($elements->length) { 
    $category = $elements->item(0); 
    $name = $category->firstChild; // implied by the structure of your XML 

    // replace the category with just the name 
    $category->parentNode->replaceChild($name, $category); 
} 

// final result: 
$result = $xml->saveXML(); 

See it in action。