用DOMDocument替换HTML中的标签 [英] Replace Tag in HTML with DOMDocument

问题描述

我正在使用PHP中的DOMDocument :: loadHTML编辑html标签。 html数据是html的一部分，而不是整个页面。我跟着这个页面（ PHP - DOMDocument - 需要更改/替换现有的HTML标签w /一个新的）说。

I'm trying to edit html tags with DOMDocument::loadHTML in php. The html data is a part of html and not the whole page. I followed what this page (PHP - DOMDocument - need to change/replace an existing HTML tag w/ a new one) says.

这应该将预标记转换为div标签，但它给出致命错误：未捕获的异常DOMException，并显示消息Not Found Error。

This should convert pre tags into div tags but it gives "Fatal error: Uncaught exception 'DOMException' with message 'Not Found Error'."

<?php
$contents = <<<STR
<pre>hi</pre>
<pre>hello</pre>
<pre>bye</pre>
STR;

$dom = new DOMDocument;
@$dom->loadHTML($contents);

foreach( $dom->getElementsByTagName("pre") as $nodePre ) {
    $nodeDiv = $dom->createElement("div", $nodePre->nodeValue);
    $dom->replaceChild($nodeDiv, $nodePre);
}

echo $dom->saveHTML();
?>

当我尝试向后迭代节点对象时，我得到这个错误，'注意：试图获取非对象的属性...'

While I'm trying to iterate the node object backwards, I get this error, 'Notice: Trying to get property of non-object...'

<?php
$contents = <<<STR
<pre>hi</pre>
<pre>hello</pre>
<pre>bye</pre>
STR;

$dom = new DOMDocument;
@$dom->loadHTML($contents);
$domPre = $dom->getElementsByTagName('pre');
$length = $domPre->length;

    For ($i = $length; $i > -1 ; $i--) {
        $nodePre = $domPre->item($i);
        echo $nodePre->nodeValue . '<br />';
//      $nodeDiv = $dom->createElement("div", $nodePre->nodeValue);
//      $dom->replaceChild($nodeDiv, $nodePre);
    }

    // echo $dom->saveHTML();
?>

Okey，已解决。由于回答的代码有一些错误我在这里发布解决方案。感谢所有。

Okey, solved. Since the answered code has some error I post the solution here. Thanks all.

解决方案：

<?php
$contents = <<<STR
<pre>hi</pre>
<pre>hello</pre>
<pre>bye</pre>
STR;

$dom = new DOMDocument;
@$dom->loadHTML($contents);
$domPre = $dom->getElementsByTagName('pre');
$length = $domPre->length;

For ($i = $length - 1; $i > -1 ; $i--) {
    $nodePre = $domPre->item($i);
    $nodeDiv = $dom->createElement("div", $nodePre->nodeValue);
    $nodePre->parentNode->replaceChild($nodeDiv, $nodePre);
}

echo $dom->saveHTML();
?>

推荐答案

问题是调用的replaceChild（）。而不是

$dom->replaceChild($nodeDiv, $nodePre);

使用

$nodePre->parentNode->replaceChild($nodeDiv, $nodePre);

更新

这是一个工作代码。似乎有一些问题替换多个节点（更多信息在这里： http://php.net /manual/en/domnode.replacechild.php ），因此您必须使用回归循环来替换元素。

Here is a working code. Seems there is some issue with replacing multiple nodes (more info here: http://php.net/manual/en/domnode.replacechild.php) so you'll have to use a regressive loop to replace the elements.

$contents = <<<STR
<pre>hi</pre>
<pre>hello</pre>
<pre>bye</pre>
STR;

$dom = new DOMDocument;
@$dom->loadHTML($contents);

$elements = $dom->getElementsByTagName("pre");
for ($i = $elements->length - 1; $i >= 0; $i --) {
    $nodePre = $elements->item($i);
    $nodeDiv = $dom->createElement("div", $nodePre->nodeValue);
    $nodePre->parentNode->replaceChild($nodeDiv, $nodePre);
}

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