DOMDocument replace text in nodeValue with <a> link

function replaceText($document, $text) {
    $xpath = new DOMXpath($document);
    foreach($xpath->query('//text()') as $node) {
        $fragment = $document->createDocumentFragment();
        $fragment->appendXML(
            preg_replace(
                '/' . $text . '+/',
                '<a href="https://google.com">' . $text . '</a>',
                $node->nodeValue
            )
        );
        $node->parentNode->replaceChild($fragment, $node);
    }
}