将DOMXpath转换为HTML字符串

有没有办法将DOMXpath对象转换回HTML？我想替换HTML的一部分

<div class='original'>Stuff</div>

我犯了一个错误。如果您有任何建议，我们将不胜感激。

看起来像。始终在

DOMDocument

实例上工作，因此您应该始终保存

DOMDocument

。请参见下面的工作演示示例：

<?php
  $xml = "<parent><div class='original'>Stuff</div></parent>";
  $doc = new DOMDocument();
  $doc->loadXML($xml);
  $xpath = new DOMXpath($doc);

  //get element to be replaced
  $old = $xpath->query("/parent/div")->item(0);

  //create new element for replacement
  $new = $doc->createElement("div");
  $new->setAttribute("class", "replacement");
  $new->nodeValue = "New Stuff";

  //replace old element with the new one
  $old->parentNode->replaceChild($new, $old);

  //TODO: save the modified HTML instead of echo
  echo $doc->saveHTML();
?>

 XPATH->saveHTML(); 

<?php
  $xml = "<parent><div class='original'>Stuff</div></parent>";
  $doc = new DOMDocument();
  $doc->loadXML($xml);
  $xpath = new DOMXpath($doc);

  //get element to be replaced
  $old = $xpath->query("/parent/div")->item(0);

  //create new element for replacement
  $new = $doc->createElement("div");
  $new->setAttribute("class", "replacement");
  $new->nodeValue = "New Stuff";

  //replace old element with the new one
  $old->parentNode->replaceChild($new, $old);

  //TODO: save the modified HTML instead of echo
  echo $doc->saveHTML();
?>

<parent><div class="replacement">New Stuff</div></parent>