PHP domDocument刪除子節點的子節點

Question

如何刪除子節點的父節點，但保留所有子節點？

XML文件是這樣的：

<?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，我需要刪除categoryPath節點和類別節點，但把所有的名字節點的產品節點的內部。我的目標是這樣一個文件：

<?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內置函數來做到這一點？任何指針將不勝感激，我只是不知道從哪裏開始，因爲有許多子節點。

感謝

Answer 1

一個好的方法來處理XML數據是使用DOM設施。

一旦你介紹它就很容易。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。