php - PHP DOMDocument:按类删除元素

Question

我正在尝试删除具有给定类的每个节点。

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？

编辑:顺便说一句:我如何首先检查DOM中是否存在带有“foo”类的元素(在开始循环之前)？

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>

这对于上面的示例不起作用:

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

Answer 1

您需要使用父元素的removeChild()方法:

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

顺便说一句，关于您的第二个问题，如果没有找到任何元素，则该循环根本不会迭代。

这是一个工作示例:

$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);