Using WSDL Interface with PHP

I just had this dumped on me...I need to connect to a WSDL interface using PHP.  It looks like nusoap is the easiest solution, but I am open to suggestions.  I was given the following interface information, and need some hints as to how exactly to connnect to this in PHP.  

I need help knowing how to map PHP variables into those in the specification.  

Please help!


[System.CodeDom.Compiler.GeneratedCodeAttribute("System.ServiceModel", "4.0.0.0")]
[System.ServiceModel.ServiceContractAttribute(ConfigurationName="Interface")]
public interface Interface
{
   
    [System.ServiceModel.OperationContractAttribute(Action="http://tempuri.org/Interface/RequestApproval", ReplyAction="http://tempuri.org/Interface/RequestApprovalResponse")]
    string RequestApproval(string Id, string Num, int points, string Code);
}

[System.CodeDom.Compiler.GeneratedCodeAttribute("System.ServiceModel", "4.0.0.0")]
public interface InterfaceChannel : Interface, System.ServiceModel.IClientChannel
{
}

[System.Diagnostics.DebuggerStepThroughAttribute()]
[System.CodeDom.Compiler.GeneratedCodeAttribute("System.ServiceModel", "4.0.0.0")]
public partial class InterfaceClient : System.ServiceModel.ClientBase<Interface>, Interface
{
   
    public InterfaceClient()
    {
    }
   
    public InterfaceClient(string endpointConfigurationName) :
            base(endpointConfigurationName)
    {
    }
   
    public InterfaceClient(string endpointConfigurationName, string remoteAddress) :
            base(endpointConfigurationName, remoteAddress)
    {
    }
   
    public InterfaceClient(string endpointConfigurationName, System.ServiceModel.EndpointAddress remoteAddress) :
            base(endpointConfigurationName, remoteAddress)
    {
    }
   
    public InterfaceClient(System.ServiceModel.Channels.Binding binding, System.ServiceModel.EndpointAddress remoteAddress) :
            base(binding, remoteAddress)
    {
    }
   
    public string RequestApproval(string Id, string Num, int points, string Code)
    {
        return base.Channel.RequestApproval(Id, Num, points, Code);
    }
}