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how to write into existing xml file using php

Hi every one I have an XML file, it's contain same tags like this:

<data>
<info><detail>first data</detail></info>
<info><detail>second data</detail></info>
<info><detail>third data</detail></info>
....
</data>

I want to add this:

<info><detail>fourth data</detail></info>

to my file.

and thanks for any help.

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$xml = simplexml_load_file('foo.xml');
$xml->addChild('info')->addChild('detail', 'fourth data');
file_put_contents('foo.xml', $xml->asXML());

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