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@ 2013-11-28T17:20:57Z

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

Output
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simplexml_load_string: documentation ( source)

preferences:dark modelive preview

70.57 ms | 402 KiB | 5 Q