Unable to consume Axis2 webservice(WSDL) using PHP client

Unable to consume Axis2 webservice(WSDL) using PHP client

call('departmentResponseComponent',array('departmentResponseComponent'=>'$reqData'));
?>
The problem is, I am unable to pass the data to the webservice call. When
they logged my string input to a file, they are getting null value.
I am able to call the function and I am getting the correct response
message for null parameter.