Wrapping a dom child in a template

[IamSAB]

I want to wrap a child element of a site with an template.

$dom = new Dom;
$dom->load('site.html');
foreach($dom->find('node') as $node) {
   $tmpl = new Dom;
   $tmpl->load('template.html');
   $tmpl->find('*[id=container])[0]->addChild($node)
   $node->getParent()->replaceChild($node->id(),$tmpl->root);
}

However I think (even if the replaceChild method works) the output will not be as expected. We add $node as child to the root of $tmpl. But what happens, when I replace $node with $tmpl?

Will $node, as child of $tmpl also get deleted? I am thinking about what is passed by value or reference and PHP handles that often very unclear ...

For wrapping also a custom function could be considered, if the above question answers with yes.

[alcaeus]

The error is in the last line:
$node->getParent()->replaceChild(). The parent of $node will be whatever #container element you found in template.html, since you added $node to it. You should save the original parent to make this work:

$dom = new Dom;
$dom->load('site.html');
foreach($dom->find('node') as $node) {
    $originalParent = $node->getParent();

    // Wrap node in template
    $tmpl = new Dom;
    $tmpl->load('template.html');
    $tmpl->find('*[id=container])[0]->addChild($node)

    // Replace original node
    $originalParent->replaceChild($node->id(), $tmpl->root);
}