The next step is to provide data in your server classes that can be used to generate Schema and WSDL. We do this by filling out the dispatch mapping and data types.

Disco Server Example
<?php
require_once 'SOAP/Value.php';
require_once 'SOAP/Fault.php';

require_once './example_types.php';

class SOAP_Example_Server {
    var $__dispatch_map = array();
    var $__typedef = array();

    function SOAP_Example_Server() {
        $this->__typedef['{http://soapinterop.org/xsd}SOAPStruct'] = 
                array(
                    'varString' => 'string',
                    'varInt' => 'int', 
                    'varFloat' => 'float'
                );

    $this->__dispatch_map['echoStruct'] =
            array(
                'in' => array('inputStruct' =>
                        '{http://soapinterop.org/xsd}SOAPStruct'),
                'out' => array('outputStruct' =>
                        '{http://soapinterop.org/xsd}SOAPStruct'),
            );
    }

    function __dispatch($methodname) {
        if (isset($this->__dispatch_map[$methodname]))
            return $this->__dispatch_map[$methodname];
        return NULL;
    }

    function echoStruct($inputStruct)
    {
        return $inputStruct->__to_soap('outputStruct');
    }
}

?>
WSDL Generated
<?xml version="1.0"?>
<definitions name="ServerExample" 
    targetNamespace="urn:ServerExample" 
    xmlns:wsdl="http://schemas.xmlsoap.org/wsdl/" 
    xmlns:soap="http://schemas.xmlsoap.org/wsdl/soap/" 
    xmlns:tns="urn:ServerExample" 
    xmlns:xsd="http://www.w3.org/2001/XMLSchema" 
    xmlns:SOAP-ENC="http://schemas.xmlsoap.org/soap/encoding/" 
    xmlns="http://schemas.xmlsoap.org/wsdl/" 
    xmlns:ns5="http://soapinterop.org/xsd">
    
    <types xmlns="http://schemas.xmlsoap.org/wsdl/">
        <schema xmlns="http://www.w3.org/2001/XMLSchema" 
            targetNamespace="http://soapinterop.org/xsd">
            <complexType name="SOAPStruct">
                <all>
                    <element name="varString" type="xsd:string" />
                    <element name="varInt" type="xsd:int" />
                    <element name="varFloat" type="xsd:float" />
                </all>
            </complexType>
        </schema>
    </types>

    <message name="echoStructRequest">
        <part name="inputStruct" type="ns5:SOAPStruct" />
    </message>
    <message name="echoStructResponse">
        <part name="outputStruct" type="ns5:SOAPStruct" />
    </message>

    <portType name="ServerExamplePort">
        <operation name="echoStruct">
            <input message="tns:echoStructRequest" />
            <output message="tns:echoStructResponse" />
        </operation>
    </portType>
    
    <binding name="ServerExampleBinding" type="tns:ServerExamplePort">
        <soap:binding style="rpc" 
            transport="http://schemas.xmlsoap.org/wsdl/http/" />
        <operation name="echoStruct">
            <soap:operation 
                soapAction="urn:SOAP_Example_Server#soap_example_server#echoStruct" />
            <input>
                <soap:body 
                    use="encoded" 
                    namespace="urn:SOAP_Example_Server" 
                    encodingStyle="http://schemas.xmlsoap.org/soap/encoding/" />
            </input>
            <output>
                <soap:body use="encoded" 
                    namespace="urn:SOAP_Example_Server" 
                    encodingStyle="http://schemas.xmlsoap.org/soap/encoding/" />
            </output>
        </operation>
    </binding>
    
    <service name="ServerExampleService">
        <documentation />
        <port name="ServerExamplePort" 
            binding="tns:ServerExampleBinding">
            <soap:address 
                location="http://localhost/pres2/presentations/slides/soap/examples/server.php" />
        </port>
    </service>
</definitions>