get element by id and get element by Value xpath in php

Question

XML file

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<ew-language id="en">
    <global>
        <phrase id="actiondeleted" value="Deleted">
            <child_phrase_1 id="1234" value="numbers">
                <child id="test_id" value="test_value"/>
                <child id="test_id" value="test_value_2"/>
            </child_phrase_1>
        </phrase>
    </global>
</ew-language>

how to get element by ID and by value so the element is unique.I tried these

     $parent = ($xpath->query("//*[@id='$previous_tag_id']")&& $xpath->query("//*[@value='$previous_tag_value']"))->item(0);
----------------------AND THIS ONE-----------------------------------
     $parent = $xpath->query("//*[@id='$previous_tag_id']/*@value='$previous_tag_value')"->item(0);
----------------------AND THIS ONE-----------------------------------
 $xpath->query("//*[@id='$previous_tag_id' and @value='$previous_tag_value']");

each syntax is not working.

Answer 1

Using //*[@id='$previous_tag_id' and @value='$previous_tag_value'] should've worked, see the demo in eval.in :

$xml = <<<XML
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<ew-language id="en">
    <global>
        <phrase id="actiondeleted" value="Deleted">
            <child_phrase_1 id="1234" value="numbers">
                <child id="test_id" value="test_value"/>
                <child id="test_id" value="test_value_2"/>
            </child_phrase_1>
        </phrase>
    </global>
</ew-language>
XML;
$doc = new DOMDocument;
$doc->loadXML($xml);
$xpath = new DOMXPath($doc);
$previous_tag_id = "test_id";
$previous_tag_value = "test_value_2";
$result = $xpath->query("//*[@id='$previous_tag_id' and @value='$previous_tag_value']");
foreach($result as $r)
{
    echo $doc->saveXML($r);
}

output :

<child id="test_id" value="test_value_2"/>