php 如何使用 DOMDocument 删除元素？
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How to delete element with DOMDocument?
提问by Kin
Is it possible to delete element from loaded DOMwithout creating a new one? For example something like this:
是否可以在DOM不创建新元素的情况下从加载中删除元素？例如这样的事情：
$dom = new DOMDocument('1.0', 'utf-8');
$dom->loadHTML($html);
foreach($dom->getElementsByTagName('a') as $href)
if($href->nodeValue == 'First')
//delete
回答by hakre
You remove the node by telling the parent node to remove the child:
您可以通过告诉父节点删除子节点来删除节点：
$href->parentNode->removeChild($href);
See DOMNode::$parentNodeDocsand DOMNode::removeChild()Docs.
请参阅DOMNode::$parentNode文档和DOMNode::removeChild()文档。
See as well:
另见：
回答by alexanderbird
This took me a while to figure out, so here's some clarification:
这花了我一段时间才弄明白，所以这里有一些澄清：
If you're deleting elements from within a loop (as in the OP's example), you need to loop backwards
如果要从循环中删除元素（如 OP 的示例中所示），则需要向后循环
$elements = $completePage->getElementsByTagName('a');
for ($i = $elements->length; --$i >= 0; ) {
$href = $elements->item($i);
$href->parentNode->removeChild($href);
}
DOMNodeList documentation: You can modify, and even delete, nodes from a DOMNodeList if you iterate backwards
DOMNodeList 文档：如果向后迭代，您可以修改甚至删除 DOMNodeList 中的节点
回答by silkfire
Easily:
容易地：
$href->parentNode->removeChild($href);
回答by PM7Temp
I know this has already been answered but I wanted to add to it.
我知道这已经得到了回答，但我想补充一下。
In case someone faces the same problem I have faced.
如果有人遇到我遇到的同样问题。
Looping through the domnode list and removing items directly can cause issues.
循环遍历 domnode 列表并直接删除项目可能会导致问题。
I just read this and based on that I created a method in my own code base which works:https://www.php.net/manual/en/domnode.removechild.php
我刚刚阅读了这篇文章，并基于此在我自己的代码库中创建了一个有效的方法：https: //www.php.net/manual/en/domnode.removechild.php
Here is what I would do:
这是我会做的：
$links = $dom->getElementsByTagName('a');
$links_to_remove = [];
foreach($links as $link){
$links_to_remove[] = $link;
}
foreach($links_to_remove as $link){
$link->parentNode->removeChild($link);
}
$dom->saveHTML();
