从html中删除标签不会被删除

Question

Am I doing something wrong here? I am trying to remove all the tags that are of one of the following: style, script, pre, code.

When I do a dump on the end result, the items that are in that block are still there.

$removes = $xpath->query('//style | //script | //pre | //code');

if($removes instanceof DOMNodeList){
    foreach($removes as $removable){
        if($removable instanceof DOMElement){
            $removable->parentNode->removeChild($removable);
        }
    }
}

$content = $this->document->getElementsByTagName('body')->item(0)->nodeValue;

var_dump($content);

Answer 1

Your code, in isolation, works fine. What is likely happening is you're working within a namespace and so your instanceof checks should use the fully-qualified names \DOMNodeList and \DOMElement (note the leading backslashes.)