Create a Container Div with DOM/XPATH - php

Question

I just created a new DOM XPATH OBJECT.
And, after a couple operations I've storage my result with SaveHtml
$String[] = $dom->saveHTML();
And then, Ive just put the content inside a file.
file_put_contents($filename, $string);
The Html Structure is someting like this.
<div if="rand11">
</div>
<div if="rand24">
</div>
<div if="rand51">
</div>
There is some methods in order to create new divs. You can use ->createElement. Also, you can place this new element with ->parentNode->insertBefore but its no possible to create a container div, like this.
<div if="container-div">
<div if="rand11">
</div>
<div if="rand24">
</div>
<div if="rand51">
</div> </div>
I tried multiples ways to do it without success.
So, I have a couple questions:
1. It is possible to create a Container Div modifying the Dom directly?
2. It is possible to adding a new Html element of an Array that contains $dom->saveHTML(); data?

Answer 1

Sure it is. Most of it is actually uses the same methods. For example appendChild()/insertBefore() are not just used for new nodes, they can move existing nodes.
$html = <<<'HTML'
<div if="rand11"></div>
<div if="rand24"></div>
<div if="rand51"></div>
HTML;
$document = new DOMDocument();
$document->loadHTML($html);
$xpath = new DOMXpath($document);
// fetch the nodes that should be put inside the container
$nodes = $xpath->evaluate('//div[starts-with(#if, "rand")]');
// validate that here is at least one node
if ($first = $nodes[0]) {
// create the container and insert it before the first
$container = $first->parentNode->insertBefore(
$document->createElement('div'), $first
);
$container->setAttribute('class', 'container-div');
// move all the fetched nodes into the container
foreach($nodes as $node) {
$container->appendChild($node);
}
// output formatted
$document->formatOutput = TRUE;
echo $document->saveHTML($container);
}
Output:
<div class="container-div">
<div if="rand11"></div>
<div if="rand24"></div>
<div if="rand51"></div>
</div>