[SOAP] php soap return empty result

I am using this soap call function to get values from wsdl .I got response
,but not any data from the server.
I need to get data from the server.
my php code
<php
    $client = new
SoapClient("http://www.alphamax3.com/AM3WebApp/services/PropertySearchServiceSoap?wsdl",
array('trace' => 1));
    $result = $client->searchInstrument( array('instrumentSearchRequest'
=>array('searchInstrument'=>array('number'=>1)) ));
    //$property = $client->searchMap();
    //$property = $client->searchInstrument();
    //echo "REQUEST:\n" . $client->__getLastResponse() . "\n";
    echo "RESPONSE:\n" . htmlentities($client->__getLastResponse()) . "\n";
?>ends php code

I don't find any documentation with the service provider(www.alphamax3.com)
. Anybody please help

Thanks for reading.
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