QueryPath\DOMQuery::unwrap PHP Method

    public function unwrap()
    {
        // We do this in two loops in order to
        // capture the case where two matches are
        // under the same parent. Othwerwise we might
        // remove a match before we can move it.
        $parents = new \SplObjectStorage();
        foreach ($this->matches as $m) {
            // Cannot unwrap the root element.
            if ($m->isSameNode($m->ownerDocument->documentElement)) {
                throw new \QueryPath\Exception('Cannot unwrap the root element.');
            }
            // Move children to peer of parent.
            $parent = $m->parentNode;
            $old = $parent->removeChild($m);
            $parent->parentNode->insertBefore($old, $parent);
            $parents->attach($parent);
        }
        // Now that all the children are moved, we
        // remove all of the parents.
        foreach ($parents as $ele) {
            $ele->parentNode->removeChild($ele);
        }
        return $this;
    }