How to view DOMNodeList object's data in php

when I want to test php array I use the following code

    print_r($myarray);

but know I want to see the data of an object my object is

    $xpath = new DOMXPath($doc);
    $myobject = $xpath->query('//*[ancestor-or-self::a]');

when I use

    print_r($myobject);

I get that output

    DOMNodeList Object ( )

I want to iterate through the values of this object to test the result of my query?