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/**
 * Remove html dom element by class name 
 *
 * @param string $className
 * @param string $html 
 * @return string
 */
function remove_dom($className, $html)
{
    $dom = new DomDocument();
    $dom->loadHTML(mb_convert_encoding($html, 'HTML-ENTITIES', 'UTF-8'), LIBXML_NOWARNING | LIBXML_NOERROR);
    $finder = new DomXPath($dom);
    $nodes = $finder->query("//*[contains(concat(' ', normalize-space(@class), ' '), ' $className ')]");
    if ($nodes->count() == 0) {
        return $html;
    }
    $nodes->item(0)->parentNode->removeChild($nodes->item(0));
    return  $dom->saveHTML();
}