XML Callback with PHP

Hi all,

I've been trying to get the order details from the ROMANCARTXML post data that is sent invisibly on completion, using PHP. After lots of testing, stressing and pure bewilderment, I finally noticed that I wasn't seeing any errors or getting any data because all the output (including correctly/working echoed variables) were going straight to the RomanCart XML Callback log and not the browser!! Even if I just used the very simple test code (shown below), it would still produce a blank screen and the latest log entry would contain the orderid value in the 'errors' column (with no errors or anything else). It's like the RomanCart log is stealing and clearing my output!!


Test Code:

<?php
$source = $_POST['ROMANCARTXML'];
$source = stripslashes($source);
$xml = simplexml_load_string($source);
echo $xml->orderid[0];
?>


Roman cart support have been worse than useless and there appears to be absolutely no documentation on this, so I'm really hoping someone here has successfully used the XML call back function with PHP and can point me in the right direction?

Any help or ideas really would be massively appreciated!