XPath avg(), min(), max() functions not found

[Alex <aleast@xxxxxxxx>]

Hi all. I'm trying to use XPath avg(), min() and max() functions
without success. Others functions like count() or sum() works correctly.

Here is the code I'm using (PHP 5.1):

<?php

$xml_str = '
<stats>
  <cards>
    <card name="My card">
      <type name="visits">25</type>
      <type name="clicks">7</type>
    </card>
    <card name="My other card">
      <type name="visits">50</type>
      <type name="clicks">3</type>
    </card>
  </cards>
</stats>
';

$xml_doc = new DOMDocument();
$xml_doc->loadXML($xml_str);

$xpath = new DOMXPath($xml_doc);

$cards_avg = $xpath->evaluate("avg(//card/type[@name='visits'])");
var_dump($cards_avg);

$cards_sum = $xpath->evaluate("sum(//card/type[@name='visits'])");
var_dump($cards_sum);

?>

I receive the following output:

asterix@apenguin:/tmp$ php test.php
PHP Warning:  DOMXPath::evaluate(): xmlXPathCompOpEval: function avg not
found in /tmp/test.php on line 23

Warning: DOMXPath::evaluate(): xmlXPathCompOpEval: function avg not found
in /tmp/test.php on line 23
PHP Warning:  DOMXPath::evaluate(): Unregistered function in /tmp/test.php
on line 23

Warning: DOMXPath::evaluate(): Unregistered function in /tmp/test.php on
line 23
object(DOMNodeList)#5 (0) {
}
float(75)
asterix@apenguin:/tmp$

Someone can help me?

Thanks in advance

Alex

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