Remove list item by class name using PHP
Question
I am trying to remove a parent list item when the child link has a class 'hide'. How would I get the class name and then remove the parent 'li' if a child within it has a the 'hide' class?
$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 answers
solution1
1 ACCPTED 2015-08-20 17:23:12
You can use DOMXPath in conjunction with DOMDocument . Try the following:
<?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:
<!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. So you are returning the parent node of any match; ie: the parent <li> of any match, in your example.
Finally, we iterate over all matching <li> elements and remove each one from its parent node.
Here's more information on DOMXPath::query()
Hope this helps :)
solution2
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; Here is a solution
$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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