PHP XML按名称删除元素和所有子项 [英] PHP XML remove element and all children by name

问题描述

我有一个XML文件结构如下：

 < root> 
< featured> 
< title>< / title> 
< tweet>< / tweet> 
< img>< / img> 
< / featured> 
< / root> 
  

元素被动态添加，用户需要在某些场合删除元素的选项， p>

我尝试了一些代码，包括：

  $ featureddel = $ xpath->查询（ '//功能'）; 
 
 while（$ featureddel-> hasChildNodes（））{
 $ featureddel-> removeChild（$ featureddel-> childNodes-> item（0））; 
} 
  

这给我一个错误：

  PHP致命错误：调用未定义的方法DOMNodeList :: hasChildNodes（）
  

Ive也试过：

  $ featureddel = $ dom-> getElementsByTagName（'featured'）; 
 $ featureddel-> parentNode-> removeChild（$ featureddel）; 
  

返回：

  PHP致命错误：调用非对象上的成员函数removeChild（）
  

解决方案

DOMElement :: getElementsByTagName 和 DOMXPath :: query 的DOMNodeList 。您的代码似乎期待着单个 DOMNode 。尝试这样：

  $ featureddel = $ xpath-> query（'// featured'）; 
 // OR：
 // $ featuredde1 = $ dom-> getElementsByTagName（'featured'）; 
 
 foreach（$ featuredde1 as $ node）{
 $ node-> parentNode-> removeChild（$ node）; 
} 
  

修改：这个确切的代码按照预期的方式工作我（PHP 5.3，Debian Squeeze）：

 <？php 
 $ xml ='< root> 
< featured> 
< title>< / title> 
< tweet>< / tweet> 
< img>< / img> 
< / featured> 
< / root>'; 
 $ dom = new DOMDocument（）; 
 $ dom-> loadXML（$ xml）; 
 $ featuredde1 = $ dom-> getElementsByTagName（'featured'）; 
 
 foreach（$ featuredde1 as $ node）{
 $ node-> parentNode-> removeChild（$ node）; 
} 
 echo $ dom-> saveXML（）; 
  

输出是：

 <？xml version =1.0？> 
< root> 
 
< / root> 
  

I have an XML file structured as:

<root>
  <featured>
    <title></title>
    <tweet></tweet>
    <img></img>
  </featured>
</root> 

The element is added dynamically , the user needs the option to remove the element on certain occasions,

I have tried a few variations of code including:

        $featureddel = $xpath->query('//featured');

while ( $featureddel->hasChildNodes()){
$featureddel->removeChild($featureddel->childNodes->item(0));
}

which gives me a error:

PHP Fatal error: Call to undefined method DOMNodeList::hasChildNodes() 

Ive also tried:

$featureddel= $dom->getElementsByTagName('featured');
$featureddel->parentNode->removeChild($featureddel);

which returns:

PHP Fatal error: Call to a member function removeChild() on a non-object

解决方案

Both DOMElement::getElementsByTagName and DOMXPath::query return a DOMNodeList. Your code seems to be expecting a single DOMNode instead. Try this:

$featureddel = $xpath->query('//featured');
// OR:
// $featuredde1 = $dom->getElementsByTagName('featured');

foreach ($featuredde1 as $node) {
    $node->parentNode->removeChild($node);
}

Edit: This exact code works as expected for me (PHP 5.3, Debian Squeeze):

<?php 
$xml = '<root>
  <featured>
    <title></title>
    <tweet></tweet>
    <img></img>
  </featured>
</root>';    
$dom = new DOMDocument();
$dom->loadXML($xml);
$featuredde1 = $dom->getElementsByTagName('featured');

foreach ($featuredde1 as $node) {
    $node->parentNode->removeChild($node);
}
echo $dom->saveXML();

The output is:

<?xml version="1.0"?>
<root>

</root>

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