FMS2 call to PHP

I don't know about loadvars.sendAndLoad, but I have FMS create a gateway connection and connect to an AMFPHP service. I use it for remoting to a database, but you could have your service do whatever you want.

example…

application.onAppStart = function() {
NetServices.setDefaultGatewayUrl(" http://yourserver.com/amfphp/gateway.php");
this.gatewayConnection = NetServices.createGatewayConnection();
}
then when a client connects I do (in application.onConnect):
newClient.service = application.gatewayConnection.getService("MssqlRemoting", new AMFPHPResult(newClient));

where MssqlRemoting.php is the name of my services file in the services dir of the AMFPHP install in my webserver root and newCient is the first arg of the application.onConnect function.

//default responser obj is defined in application root:
function AMFPHPResult(client) {
this.client = client;
}

then the serveside Client instance can do this:
this.service.initUsage(args);
where initUsage is a function in your AMFPHP service.

and your callback would look like this (in application root):
AMFPHPResult.prototype.initUsage_Result = function(e) {
trace(e);
}

check out AMFPHP for examples of implementing a service.