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@ 2014-05-27T23:22:48Z

<?php
$xml=simplexml_load_string(<<<XML
<people>
    <person>
    </person>
    <person id="17">
        <test>John</test>
    </person>
    <person>
    </person>
</people>
XML
                           );
$nodes=$xml->xpath('//person[@id=17]');
foreach($nodes as &$node)
{
    $node->test="Bill";
}
echo $xml;

Output
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simplexml_load_string: documentation ( source)

preferences:dark modelive preview

51.44 ms | 402 KiB | 5 Q