PHP XML 按名称删除元素和所有子元素

Question

我有一个结构如下的 XML 文件:

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

元素是动态添加的，用户需要在某些场合选择删除元素，

我尝试了一些代码变体，包括:

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

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

这给了我一个错误:

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

我也试过:

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

返回:

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

Answer 1

DOMElement::getElementsByTagName 和 DOMXPath::query 都返回一个 DOMNodeList。您的代码似乎需要一个 DOMNode 来代替。试试这个:

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

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

编辑:这段代码完全符合我的预期(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>