Can't parse XML using simplexml_load_string in PHP

How to pass the following message in PHP?

<?xml version="1.0" encoding="utf-8"?>

<response>
  <action>sendmessage</action>
  <data>
    <acceptreport>
      <statuscode>0</statuscode>
      <statusmessage>Message accepted for delivery</statusmessage>
      <messageid>8abbaf6c-3bdd-4fb7-9c49-282270bbb309</messageid>
      <originator>admin</originator>
      <recipient>233xxx</recipient>
      <messagetype>SMS:TEXT</messagetype>
      <messagedata>mdata</messagedata>
    </acceptreport>
  </data>
</response>

I have tried

$xml = simplexml_load_string($data);
var_dump($xml['data']);

and

var_dump($xml->attributes());

Nothing seems to be working. Any clue? What am I missing?