get the grandson nodeValue when using XPath - php

Question

I am looking for a way to retrieve a nodeValue of a grandson. I only have unambiguous access to "I have unambiguous access to this class" class as shown below. How do I do it?
<class="I have unambiguous access to this class">
- <class="childClass">
-- <class="grandsonClass">
///////
function curlGet($url){
$ch = curl_init($url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, TRUE);
curl_setopt($ch, CURLOPT_HTTPHEADER, array($url));
$results = curl_exec($ch);
curl_close($ch);
return $results;
}
function returnXPathObject($item){
$xmlPageDom = new DOMDocument();
#$xmlPageDom->loadHTML($item);
$xmlPageXPath = new DOMXPath($xmlPageDom);
return $xmlPageXPath;
}
$examplePage = curlGet("www.example.com");
$exampleXPath = returnXPathObject($examplePage);
$rating = $exampleXPath->query("//span[#class='grandfather']"); // I can access this guy, but I want it's grandchild.
// get child of grandfather's child (grandson of grandfather)

Answer 1

You can do relative XPath query by passing the 'grandfather' $rating as the context element :
$query = "./span[#class='childClass']/span[#class='grandsonClass']";
$grandSon = $exampleXPath->query($query, $rating);