[PHP-SOAP-GENERAL] nusoap and require_once

[Andrea L. <gar...@li...>]

Hi all,

I have a huge problem with nusoap. Once I add a require_once('file.php') 
to my nusoap code my webservice doesn't work anymore.
ERROR:
Response not of type text/xml
RESPONSE
output started with file.php.

file.php can be either empty or like this one

<?php
$a='b';
?>

What's happening?!?

How can I fix the problem?
Thanks a lot.
Andrea