$parent = new DOMElement('parent'); $child = new DOMElement('child'); $parent->appendChild($child); // add child to parent $newParent = new DOMElement('new-parent'); $newParent->appendChild($child); // move child to new parent $child->setParent($newParent); // set new parent for childIn this example, we create a parent node and a child node. We add the child node to the parent node using the appendChild method. Then we create a new parent node and move the child node to this new parent node using the appendChild method again. Finally, we use the setParent method to set the new parent node as the parent of the child node. This code example belongs to the PHP DOM package library which provides a convenient way to work with XML and HTML documents.