How do you find the deepest node (steps) - Xpath - php - xml -

Question

Greetings

How do you find the deepest node? So for this example, String would be the deepest node:

and the result that I want is 5

Answer 1

With XPath 2.0 you could write a single XPath expression I think, as max(descendant::*[not(*)]/count(ancestor::*)). With XPath 1.0 you could find the node with XSLT as the host language as in

If you use PHP as the "host" language for XPath you can probably write something similar with a loop over descendant::*[not(*)], the elements not having any child elements, and computing count(ancestor::*) for each of them and storing the maximum value.

[edit] Here is some attempt at PHP:

$xpath = new DOMXPath($doc);

$leafElements = $xpath->query("descendant::*[not(*)]");
$max = 0;

foreach ($leafElements as $el) {
  $count = $xpath->evaluate("count(ancestor::*)", $el);
  if ($count > $max) {
    $max = $count;
  }
}
// now use $max here