I was working with SOAP for the first time and I had to create a client that sent a date range to a WSDL (Web Services Description Language) to return some information I needed. I didn't know how to pass the params and there really was no documentation about it. The main thing you have to make sure to do is when you pass params to a method that is definied by the WSDL that you are calling is that you use the same param name for the key of the array or the object variable as shown below. Also, if you don't know what the methods/functions that a WSDL has or the params that you need to pass it you can use the __getFunctions() and __getTypes() methods after you declare your new SoapClient.
<?php
$params["From"] = "06/01/2005"; // also can use $params->From = "date";
$params["to"] = "12/31/2005"; // also can use $params->to = "date";
