php loading xml into array

<?php
$xmlstring=file_get_contents("http://180.110.13.81/default/en_US/send_sms_status.xml");
$xml = simplexml_load_string($xmlstring);
$json = json_encode($xml);
$array = json_decode($json,TRUE);
print_r($array);
echo " $array[smskey1] $array[status1] $array[error1]";
?>

This XML file does not appear to have any style information associated with it. The document tree is shown below.

<send-sms-status>

<smskey1>697409980</smskey1>

<status1>DONE</status1>

<error1/>

<smskey2/>

<status2/>

<error2/>

<smskey3/>

<status3/>

<error3/>

<smskey4/>

<status4/>

<error4/>

<smskey5/>

<status5/>

<error5/>

<smskey6/>

<status6/>

<error6/>

<smskey7/>

<status7/>

<error7/>

<smskey8/>

<status8/>

<error8/>

</send-sms-status>