DOMDocument Remove div and it content by identifier with PHP

87 Views Asked by Donald At 24 April 2025 at 18:59

Hi I wanna remove a line from a HTML file with PHP like this:

<div id="buttons">
    <div id="buttonid_4"><a href="#">Button 4</a></div>
    <div id="buttonid_3"><a href="#">Button 3</a></div>
    <div id="buttonid_2"><a href="#">Button 2</a></div>
    <div id="buttonid_1"><a href="#">Button 1</a></div>
</div>

So, I wanna remove the buttonid_4, and it content. That it will be like this:

<div id="buttons">
    <div id="buttonid_3"><a href="#">Button 3</a></div>
    <div id="buttonid_2"><a href="#">Button 2</a></div>
    <div id="buttonid_1"><a href="#">Button 1</a></div>
</div>

First I think it is easy, but I can't found the answer :|

I tried: "as simple"

                    $dom = new DOMDocument('1.0', 'utf-8');
                    $dom->loadHTMLFile($The_Path_For_File);
                    $element = $dom->getElementById('buttonid_'. $Button_Id);
                    $element->parentNode->removeChild($element);
                    $dom->saveHTMLFile($The_Path_For_File);

I got

Call to a member function removeChild() on a non-object

and everytime when I tried with GetElementById, so I continue with XPATH:

                    $xpath = new DOMXpath($dom);

                    $nodeList = $xpath->query('//div[@id="buttonid'.$Button_Id.'"]');
                    foreach($nodeList as $element){
                        $dom->$element->removeChild($element);
                    }
                    $dom->saveHTMLFile($The_Path_For_File);

I didn't get error, the notepad requested the refresh for file, but no change Anyone know how to produce this?

Original Q&A

There are 1 best solutions below

BizzyBob On 03 January 2017 at 23:29 BEST ANSWER

The use of getElementById requires a Document Type Declaration (DTD). PHP Documentation

Notice your HTML fails validation $dom->validate()

Just add <!DOCTYPE html> to your HTML and it will work.

For this function to work, you will need either to set some ID attributes with DOMElement::setIdAttribute or a DTD which defines an attribute to be of type ID. In the later case, you will need to validate your document with DOMDocument::validate or DOMDocument::$validateOnParse before using this function.

DOMDocument Remove div and it content by identifier with PHP

There are 1 best solutions below

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