PHP XML 按名称删除元素和所有子项

Question

我有一个结构为的 XML 文件：

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

元素是动态添加的，用户需要选择在某些情况下删除元素，

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

双方DOMElement::getElementsByTagName并DOMXPath::query返回DOMNodeList。您的代码似乎需要一个DOMNode。尝试这个：

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

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

编辑：这个确切的代码对我来说按预期工作（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>