Description:
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Making a call to a simple perl-based SOAP service is failing with no error/exception (the result is null/empty).  
I use the nusoap.php package to make the same call and it succeeds.

The soap method reverse returns the reverse of the inputted string.  

I am trying to call the reverser method from this WSDL:
http://jabba.incogen.com:8888/soapStringHandler.wsdl like this (see code for more details): 
$results = $builtinSoap->reverser( "asd" );

I get no result, even though it works via nusoap.php, perl soap clients, .NET soap clients, etc.  

I assume this is just user error, if so I apologize.  

Reproduce code:
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$wsdlUrl = 'http://jabba.incogen.com:8888/soapStringHandler.wsdl';
  
    try {
       $builtinSoap = new SoapClient( $wsdlUrl );
            // print_r( $builtinSoap->__getFunctions() );
            $results = $builtinSoap->reverser( "asd" );
            if(!$results){print "Got no results from builtin soap!";}
            // $builtinSoap->__getLastResponse();
            $body .= 'Result returned from web service: <b>' . $results . '</b>';
    } catch (SoapFault $fault) {
       trigger_error("SOAP Fault: (faultcode: {$fault->faultcode}, faultstring: {$fault->faulstring})", E_ERROR);
    }

Expected result:
----------------
I would expect "dsa" as the result

Actual result:
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NULL/nothing