PHP pass complex type to WCF

Right now I use PHP soapclient to call the WCF, but cannot pass complex object to the WCF
WCF Code

Code:

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public int Test (input env){
return 0;}
public class input{
  public int ID;}

---

PHP code

Code:

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$client = new SoapClient('http://localhost:5555/jobdispatch.svc?wsdl');
$env->ID=1;
$webService1 = $client-> Test($env);

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when Debug in WCF, found the env is null;I also try the __SoapCall, get the same result.

How to solve it.

Thanks