FluentDOM + HTML5

HTML 5 is not directly supported by PHPs DOM extension. That means FluentDOM can not understand it, too. But here is a solution. HTML5-PHP is library that can parse HTML5 into a DOM document.

Both libraries use Composer:

"require": {
  "fluentdom/fluentdom": "5.*",
  "masterminds/html5": "2.*"
}

Read HTML5 into FluentDOM:

$html5 = new Masterminds\HTML5();
$fd = FluentDOM($html5->loadHTML($html));

Or write it:

echo $html5->saveHTML($fd->document);

HTML5-PHP puts the elements into the XHTML namespace. To use XPath expressions, you will need to register a prefix for it:

$html5 = new Masterminds\HTML5();
$fd = FluentDOM($html5->loadHTML($html));
$fd->registerNamespace(
  'xhtml', 'http://www.w3.org/1999/xhtml'
);
echo $fd->find('//xhtml:p')->text();