Nusoap - fix empty xmlns attribute for the response

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PHP

webservice

Hi, I have created a simple web service using Php Nusoap. It's working correctly but the only thing missing is to add the default xmlns attribute to the response tag.
Here is the copy of Response :

<?xml version="1.0" encoding="ISO-8859-1"?>
<SOAP-ENV:Envelope SOAP-ENV:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/" xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:SOAP-ENC="http://schemas.xmlsoap.org/soap/encoding/">
  <SOAP-ENV:Body>
    <LoginResponse xmlns="">
      <LoginResult>
        <register>
          <customer>d2ff3b88d34705e01d150c21fa7bde07</customer>
        </register>
      </LoginResult>
    </LoginResponse>
  </SOAP-ENV:Body>
</SOAP-ENV:Envelope>

Here is the code :

<?php
require_once ('nusoap.php');
// set namespace
$ns = 'mynamspace';
// set up soap server
$server = new soap_server ();
$server->configureWSDL ( 'testservice', $ns);
$server->wsdl->schemaTargetNamespace = $ns;
// define new user data type

// define results

$server->wsdl->addComplexType ( 'customer', 'complexType', 'struct', '', '', array ('customer' => array ('name' => 'customer', 'type' => 'xsd:string' ) ) );
$server->wsdl->addComplexType ( 'register', 'complexType', 'struct', '', '', array ('register' => array ('name' => 'register', 'type' => 'tns:customer' ) ) );
$server->wsdl->addComplexType ( 'LoginResult', 'complexType', 'struct', '', '', array ('LoginResult' => array ('name' => 'LoginResult', 'type' => 'tns:register' ) ) );
// register Login function
$server->register ( 'Login', // method name
array ('username' => 'xsd:string', 'password' => 'xsd:string' ), // input parameters
array ('LoginResult' => 'tns:register' ), // output parameters
'urn:mynamespace', // namespace
'urn:mynamespaceAction', // soapaction
'document', // style
'literal', // use
'Login service for testing' ); // documentation

function Login($username, $password) {
    if (isset ( $username ) && isset ( $password )) {
        $hash = md5 ( $username );
        return array ('LoginResult' => array ('register' => array ('customer' => $hash ) ));
    }
}
// Use the request to (try to) invoke the service
$HTTP_RAW_POST_DATA = isset ( $HTTP_RAW_POST_DATA ) ? $HTTP_RAW_POST_DATA : '';
$server->service ( $HTTP_RAW_POST_DATA );
?>

Any help is greatly appreciated.