使用PHP按类名称删除列表项
[英]Remove list item by class name using PHP
问题描述
I am trying to remove a parent list item when the child link has a class 'hide'. 
我试图在子链接具有“隐藏”类时删除父列表项。 How would I get the class name and then remove the parent 'li' if a child within it has a the 'hide' class? 如果班级中的孩子有“隐藏”班级，我将如何获取班级名称，然后删除其父级“ li”？
$html = '<ul>
<li><a href="/first">First Item</a></li>
<li><a class="hide" href="/first">First Item</a></li>
</ul>';
$dom = new DOMDocument;
@$dom->loadHTML($html);
foreach ($dom->getElementsByTagName('li') as $tag){
// Check if there is a hide and remove the parent list item
}
2 个解决方案
解决方案1
1 已采纳 2015-08-20 17:23:12
You can use DOMXPath in conjunction with DOMDocument . 您可以将DOMXPath与DOMDocument结合使用。 Try the following: 请尝试以下操作：
<?php
$html = '<ul>
<li><a href="/first">First Item</a></li>
<li><a class="hide" href="/first">Second Item</a></li>
</ul>';
$dom = new DOMDocument();
$dom->loadHTML($html);
$xpath = new DOMXPath($dom);
$elements = $xpath->query('//a[@class="hide"]/..');
foreach ($elements as $el) {
$el->parentNode->removeChild($el);
}
echo $doc->saveHTML();
Yields: 产量：
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"
"http://www.w3.org/TR/REC-html40/loose.dtd">
<html>
<body>
<ul>
<li><a href="/first">First Item</a></li>
</ul>
</body>
</html>
The XPath expression //a[@class="hide"]/.. will match any <a> tags containing the "hide" class, and /.. returns its parent. XPath表达式//a[@class="hide"]/..将匹配任何包含“ hide”类的<a>标记，并且/..返回其父项。 So you are returning the parent node of any match; 因此，您将返回任何匹配项的父节点； ie: the parent <li> of any match, in your example. 即：在您的示例中，任何匹配项的父<li> 。
Finally, we iterate over all matching <li> elements and remove each one from its parent node. 最后，我们遍历所有匹配的<li>元素，并将每个元素从其父节点中删除。
Here's more information on DOMXPath::query() 以下是有关DOMXPath::query()的更多信息
Hope this helps :) 希望这可以帮助 ：）
解决方案2
1 2015-08-20 17:42:21
As i understand you need to delete the first li from the ul based on a class name of the internal a element; 据我了解，您需要根据内部a元素的类名从ul中删除第一个li； Here is a solution 这是一个解决方案
$html = '<ul>
<li><a href="/first">First Item</a></li>
<li><a class="hide" href="/first">First Item</a></li>
</ul>';
$doc = new DOMDocument;
@$doc->loadHTML($html);
$xpath = new DOMXpath($doc);
$elements = $xpath->query("//ul/li/a[@class='hide']/parent::*/preceding-sibling::*[1]");
foreach($elements as $node) {
$node->parentNode->removeChild($node);
};
echo $doc->saveHTML();
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