Wrap tag in Libxml

Question

I am currently build on top of an existing libxml code and couldn't find a detailed documentation.

Is it possible to wrap a tag around a node?

I thought this would work:

$tags = $doc->getElementsByTagName( 'pre' );

foreach( $tags as $tag ):

    $handler = $doc->createElement( 'div' );
    $handler->setAttribute( 'class', 'pre_wrapper' );
    $newnode = $handler->appendChild( $tag );

    $tag->replaceNode( $newnode );

endforeach;

Answer 1

The problem is that $handler->appendChild($tag) unlinks the element $tag from its original location, so the following replaceNode doesn't have the desired effect. This means that you have to swap the order of calls. Also, I couldn't find a replaceNode method, but there's replaceChild which has to be invoked on the parent node:

# Create wrapper element
$handler = $doc->createElement('div');
$handler->setAttribute('class', 'pre_wrapper');
# Replace wrapped element with wrapper
$tag->parentNode->replaceChild($handler, $tag);
# Move wrapped element into wrapper
$handler->appendChild($tag);

Try it online!