Is it possible to select HTML comments using QueryPath?

I see this is possible using开发者_如何学运维 jQuery, but how can it be done in QueryPath?

Selecting HTML Comments with jQuery

If not, can anyone suggest an HTML parser that can select comments?

---

QueryPath comes with an extension called QPXML that has several add-on methods. One of these is comment().

To use it, simply include it in your script:

include 'QueryPath/QueryPath.php';
include 'QueryPath/Extensions/QPXML.php';

htmlqp($html, $selector)->comment();

This will retrieve the first comment attached to the presently selected node(s).

If you have a really sophisticated set of comments all within the same nodes, you can do something like this:

$nodes = $qp->get();
foreach ($nodes as $node) {
   foreach ($node->childNodes as $child) {
      if ($child->nodeType == XML_COMMENT_NODE) {
         // $child is a comment.
         print $child->textContent;
      }
   }
}

This is a little uglier, but it gives better access to cases where one element has a lot of comments in it.

---

To get ALL comments of HTML page via querypath :

    function  getAllComments($node) {
        if ($node->hasChildNodes()) {
            foreach ($node->childNodes as $child) {
                $this->getAllComments($child);
                if ($child->nodeType == XML_COMMENT_NODE) {
                    echo  $child->textContent;
                }
            }

        }
    }

    $html = $qp->get() ;
    getAllComments($html[0]);