PHP Xpath Doesn't Obtain Count Function - php

Question

Update
To avoid delete this question, after a few comments I realized that, PHP uses Xpath 1.0 so I was trying to use functions from Xpath version 2.0.
Thanks for your feedback and hope some high reputation users suggest me if it's better to delete the question or leave it with this update.
I have been searching this problem but none of the solutions posted worked for me. I'm using DomXPath in PHP and I have used the Template Tester for Xpath 2.0 to test my queries: http://videlibri.sourceforge.net/cgi-bin/xidelcgi
This is the first part of the code to start working on it:
$dom_html = new DOMDocument();
libxml_use_internal_errors(true);
$dom_html->loadHTMLFile($file);
libxml_clear_errors();
$xpath = new DOMXPath($dom_html);
Then I try this query in the Xpath 2.0 Tester:
//table/tbody/tr/td/div/count(table)
This query give me the amount of that each div has inside of it and it's a perfect solution for me:
11
2
1
1
2
14
4
19
4
4
3
2
9
16
But when I tried to make the same in PHP, I have not obtain those numbers. I have trying the following solutions:
$quantity = $xpath->evaluate('count(//table/tbody/tr/td/div/table)');
But this give me the total count and not give me the desired solution.
$quantity = $xpath->query('//table/tbody/tr/td/div/count(table)');
When I make this query, I tried using two different ways to obtain mi desired answer but none of them works for me:
1)
foreach ($quantity as $content)
{
echo $content->nodeValue;
}
2)
foreach ($quantity as $content)
{
echo $contenido->textContent;
}
Thanks