Sending schema with nusoap in PHP to .NET webservice

Not sure what my question is here but I need some pointers.

This is part of a guide for sending Insurance policy information to a webservice to get a quote in return. Where 'schema' and 'xml' need to be replaced.

<soap:Body>
    <Quote xmlns="http://[etc]/">
      <PolicyDetails>
        <xsd:schema>schema</xsd:schema>xml</PolicyDetails>
    </Quote>
</soap:Body>

I am using nusoap (PHP soap extensions aren't on the 开发者_如何学Goserver and I can't install them) and I would normally send something like:

$client->call('Quote', 'PolicyDetails' => $xml);

But this doesn't work. I get the error:

Error: soap:Server: Server was unable to process request. ---> Object reference not set to an instance of an object.

I assume because I'm missing out the 'schema' part. I know what the XML should look like but not what I have to add to 'schema' or how I should do it. Can anyone point me in the right direction?

Do you know what variables you need to send ?

Try my code which I use in my webserwice case:

<?php
require_once("nusoap/lib/nusoap.php");

/* Initialize parameter */
$param = array(
     'PolicyDetails' => array(
        'variableName' => 'variable',
        'variableName2' => 'variable2',
     ),
);

/* create client */
$endpoint = "https://webserviceurl";
$mynamespace = "";

$client = new nusoap_client($endpoint, true);
$err = $client->getError();
if ($err) {
    exit();
}

$response = $client->call('Quote', $param, $mynamespace);
$err = $client->getError();
if ($err) {
    exit();
}

print_r($response);

?>