PHP DOMDocument：按类删除元素 [英] PHP DOMDocument: Delete elements by class

问题描述

我试图删除具有给定类的每个节点。

I' trying to delete every node with a given class.

要查找我使用的元素：

$xpath = new DOMXPath($dom);
    foreach( $xpath->query('//div[contains(attribute::class, "foo")]') as $e ) {
        // Delete this node
    }

但是如何删除此foreach循环中的元素？

But how can I delete the elements in this foreach-loop?

编辑：：我如何首先检查DOM中是否有一个元素为 foo的元素（在开始循环之前）？

By the way: How can I check first if there is a element with the class "foo" in the DOM (before starting the loop)?

更新：

这是我的HTML：

<div class="main">
    <div class="delete_this" contenteditable="true">Target</div>
    <div class="class1"></div>
    <div class="content"><p>Anything</p></div>
</div>

这不适用于上面的示例：

This doesn't work for the example above:

$xpath = new DOMXPath($dom);
foreach( $xpath->query('//div[contains(attribute::class, "delete_this")]') as $e ) {
    $e->parentNode->removeChild($e);
}

推荐答案

您需要使用<父元素的code> removeChild（）方法：

$xpath = new DOMXPath($dom);
foreach($xpath->query('//div[contains(attribute::class, "foo")]') as $e ) {
    // Delete this node
    $e->parentNode->removeChild($e);
}

Btw，关于第二个问题，如果没有找到元素，则循环

Btw, about your second question, if there are no elements found, the loop won't iterate at all.

以下是一个有效的示例：

Here comes a working example:

$html = <<<EOF
<div class="main">
    <div class="delete_this" contenteditable="true">Target</div>
    <div class="class1"></div>
    <div class="content"><p>Anything</p></div>
</div>
EOF;

$doc = new DOMDocument();
$doc->loadHTML($html);

$selector = new DOMXPath($doc);
foreach($selector->query('//div[contains(attribute::class, "delete_this")]') as $e ) {
    $e->parentNode->removeChild($e);
}

echo $doc->saveHTML($doc->documentElement);

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