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14 years ago
If the query() function seems to ignore your $contextnode, and instead returns all the tags in the document, try to use a relative path (use a . in front of the query):

<?php
    $xml = "<?xml version='1.0' encoding='UTF-8'?>
        <test>
            <tag1>
                <uselesstag>
                    <tag2>test</tag2>
                </uselesstag>
            </tag1>
            <tag2>test2</tag2>
        </test>";
   
    $dom = new DomDocument();
    $dom->loadXML($xml);
    $xpath = new DomXPath($dom);
   
    $tag1 = $dom->getElementsByTagName("tag1")->item(0);
   
    echo $xpath->query("//tag2")->length; //output 2 -> correct
    echo $xpath->query("//tag2", $tag1)->length; //output 2 -> wrong, the query is not relative
    echo $xpath->query(".//tag2", $tag1)->length; //output 1 -> correct (note the dot in front of //)
?>

See that i couldn't use $xpath->query("tag2", $tag1) as per the documentation, since "tag2" is not a direct child of "tag1".
I don't know why this note was deleted, i just tested it and it's correct.
It's not a bug, it's simply not written in the documentation.
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