PHP: "Couldn' t 获取 DOMElement。节点不再存在于"using DOMXpath

Question

我有一些包含以下内容的 HTML:

<div class="test">
  Outer
  <div class="test">Inner 1</div>
  <div class="test">Inner 2</div>
</div>

我正在对这些元素的内容执行 str_replace():

$dom = new DOMDocument();
$dom->loadHTML($html);
$xpath = new DOMXpath($dom);

foreach($xpath->query("//div[@class='test']") as $node) {
    $node->nodeValue = str_replace(" ", "X", $node->nodeValue);
}

这应该用“X”替换所有空格。

但它会导致这个错误:

Warning: Couldn't fetch DOMElement. Node no longer exists in /path/to/my/file.php on line 63

如果只有一个嵌套的 div，它会起作用:

<div class="test">
  Outer
  <div class="test">Inner 1</div>
</div>

为什么会发生这种情况，我该如何让它发挥作用？

Answer 1

尝试改变

foreach($xpath->query("//div[@class='test']") as $node) 

到

foreach($xpath->query('//div[@class="test"]//div[@class="test"]') as $node)

根据评论编辑:

假设外部元素中有一个空格(即它的“Outer 1:”):

<?php
$string = <<<XML
<div class="test">
  Outer 1
  <div class="test">Inner 1</div>
  <div class="test">Inner 2</div>
</div>
XML;
$dom = new DOMDocument();
$dom->loadHTML($string);
$xpath = new DOMXpath($dom);

foreach($xpath->query('//div[@class="test"]//text()') as $node) {
   $nnode = trim($node->nodeValue);

   echo $nnode  = str_replace(" ", "X", $nnode);
}