如何删除DOM元素标签，但保留其内容？ [英] How can I remove DOM element tags but leave their contents?

问题描述

我有PHP代码可以删除至少有一个属性的所有节点。 这里是我的代码：

 <？php 
 
 $ data =<<< DATA 
< div> 
< p>这些行将保持< / p> 
< p class =myclass>删除此一个< / p> 
< p>但是保持这个< / p> 
< div style =color：red>和此< / div> 
< / div> 
 DATA; 
 
 $ dom = new DOMDOcument（）; 
 $ dom-> loadHTML（$ data，LIBXML_HTML_NOIMPLIED）; 
 $ dom-> removeChild（$ dom-> doctype）; 
 
 $ xpath = new DOMXPath（$ dom）; 
 
 $ lines_to_be_removed = $ xpath-> query（// * [count（@ *）> 0]）; 
 
 foreach（$ lines_to_be_removed as $ line）{
 $ line-> parentNode-> removeChild（$ line）; 
} 
 
 //只是为了检查
 echo $ dom-> saveHTML（）; 
？> 
  

正如你在小提琴中看到的，这是上面代码的当前输出：

 < div> 
< p>这些行将保持< / p> 
 
< p>但是保持这个< / p> 
 
< / div> 
  

虽然这是所需的结果：

 < DIV> 
< p>这些行将保持< / p> 
删除这个
< p>但是保持这个< / p> 
和这个
< / div> 
  

我该怎么做？

示例：

在解除元素之前，您要删除其子节点并将其贴在后面。 >

  $ data =<<< DATA 
< div> 
< p>这些行将保持< / p> 
< p class =myclass>删除此一个< / p> 
< p>但是保持这个< / p> 
< div style =color：red>和此< / div> 
< div style =color：red>和< p>也< / p>该< / DIV> 
< div style =color：red>，< div style =color：red>< / div>< / div> 
< / div> 
 DATA; 
 
 $ dom = new DOMDocument（）; 
 $ dom-> loadHTML（$ data，LIBXML_HTML_NOIMPLIED | LIBXML_HTML_NODEFDTD）; 
 $ xpath = new DOMXPath（$ dom）; 
 
 foreach（$ xpath-> query（// * [@ *]）as $ node）{
 $ parent = $ node-> parentNode; 
 while（$ node-> hasChildNodes（））{
 $ parent-> insertBefore（$ node-> lastChild，$ node-> nextSibling）; 
} 
 $ parent-> removeChild（$ node）; 
} 
 
 echo $ dom-> saveHTML（）; 
  

输出：

 code>< DIV> 
< p>这些行将保持< / p> 
删除这个
< p>但是保持这个< / p> 
和
和< p>也< / p>这个
这个也是
< / div> 
  

https://3v4l.org/9qHRM

（我添加了一些嵌套元素来展示这种方法的安全性。）

---

几个旁边：

• 你不需要 $ dom-> removeChild（$ dom-> doctype）如果您使用附加的 LIBXML_HTML_NODEFDTD 标志加载


• 您的xpath表达式可以简化为 // * [@ *]

I have PHP code which removes all nodes that have at least one attribute. Here is my code:

<?php

$data = <<<DATA
<div>
    <p>These line shall stay</p>
    <p class="myclass">Remove this one</p>
    <p>But keep this</p>
    <div style="color: red">and this</div>
</div>
DATA;

$dom = new DOMDOcument();
$dom->loadHTML($data, LIBXML_HTML_NOIMPLIED);
$dom->removeChild($dom->doctype);

$xpath = new DOMXPath($dom);

$lines_to_be_removed = $xpath->query("//*[count(@*)>0]");

foreach ($lines_to_be_removed as $line) {
    $line->parentNode->removeChild($line);
}

// just to check
echo $dom->saveHTML();
?>

As you see in the fiddle, this is the current output of code above:

<div>
    <p>These line shall stay</p>

    <p>But keep this</p>

</div>

While this is desired result:

<div>
    <p>These line shall stay</p>
    Remove this one
    <p>But keep this</p>
    and this
</div>

How can I do that?

解决方案

Prior to removing the elements you want to pluck out their child nodes and tack them on behind it.

Example:

$data = <<<DATA
<div>
    <p>These line shall stay</p>
    <p class="myclass">Remove this one</p>
    <p>But keep this</p>
    <div style="color: red">and this</div>
    <div style="color: red">and <p>also</p> this</div>
    <div style="color: red">and this <div style="color: red">too</div></div>
</div>
DATA;

$dom = new DOMDocument();
$dom->loadHTML($data, LIBXML_HTML_NOIMPLIED | LIBXML_HTML_NODEFDTD);
$xpath = new DOMXPath($dom);

foreach ($xpath->query("//*[@*]") as $node) {
    $parent = $node->parentNode;
    while ($node->hasChildNodes()) {
        $parent->insertBefore($node->lastChild, $node->nextSibling);
    }
    $parent->removeChild($node);
}

echo $dom->saveHTML();

Outputs:

<div>
    <p>These line shall stay</p>
    Remove this one
    <p>But keep this</p>
    and this
    and <p>also</p> this
    and this too
</div>

https://3v4l.org/9qHRM

(I added some nested elements to demonstrate the safety of this approach.)

---

Couple of asides:

• You don't need $dom->removeChild($dom->doctype) if you load with the additional LIBXML_HTML_NODEFDTD flag.
• Your xpath expression can be simplified to //*[@*]

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