I\'m making my first attempt to connect to a SOAP server from PHP, and I\'m not understanding how to log in and get the data I need. The service I\'m trying to connect to i
You're close. Looking at the WSDL the InventoryList method takes an object called "request". Modify your call line slightly:
$client->InventoryList(array("request" => array("LoginId" => $login_id, "Password" => $password));