DOMXpath query（）不提供预期的上下文获取

Question

Help greatly appreciated.

Can't make DOMXpath pull necessary DOMNodes in context.
Somehow at each for iteration $a is a DOMNodeList (length=31) of what seems to be all <a> from the whole DOM of expected children of only one $childNode from all (and length should be 4).

IMHO: To me it feels like context remains at the root of html rather than changing accordingly to foreach ... If so, is it possible to alter its behavior as reqiured?

PS , have tried changed Xpath query $a = $xpath->query('.') and recieved DOMElement->tagName="html" .
So, in addition to my previous question on DOMXpath DOMNodeList it seems that DOMDocument doesn't give a hell about DOMXpath. No connection between theese two, no context usage available...

Answer: Meh, it's just me being blind idiot..have missed 2nd parameter of DOMXpath::query()

$dom = new DOMDocument();
$dom -> loadHTML('HTML data');
$xpath = new DOMXpath($dom);

$myDivs = $xpath -> query('//div[@price]');

for($i=0; $i <= $myDivs->length-1; $i++) {

  $childNodes = $myDivs->item($i)->childNodes;

  foreach($childNodes as $childNode){
    $a=$xpath->query('.//a[@data-image-src]');

     if($a){
       usleep(1);
     }

 }                

Answer 1

You need to provide the context node as a second argument to the DOMXPath::query() method.

In your particular case, that would be:

$a = $xpath->query('.//a[@data-image-src]', $childNode);