SimpleXML - How to print indexes with foreach?

[Stenan]

I have an xml file named test_forum.xml, with the following structure:

<?xml version="1.0" standalone="yes"?>
<tests>
<test>
<title>Test 1</title>
<number>15</number>
<client>Client 1</client>
</test>
<test>
<title>Test 2</title>
<number>16</number>
<client>Client 2</client>
</test>
</tests>

In PHP 5.2, I use SimpleXML to load the file in the variable $xml as following:

$path_xml = 'test_forum.xml';
$xml = simplexml_load_file($path_xml);

To print the tags <title>, I use xpath as following:

foreach ($xml->xpath('//test') as $t) {
echo $t->title, '<BR>';
}

The output is as expected:

Test 1
Test 2

Now the problem: using foreach I'd like to print, together with the tag <title>, also the relative position inside of the array, something like this:

0 - Test 1
1 - Test 2

where 0 and 1 are the positions of the tags inside of the original xml, where Test 1 is the node title in test[0], and Test 2 is the node title in test[1].

How to do it? I'd be gratefull to anyone could help me find a solution.

Thanks
Stefano