Basic Web Services Help

Hello there, I am trying to get my head around web services using Actionscript. I have followed the tutorial from NatronP which was really useful and I understand all of the code in it. My problem is that this example uses a PHP file on another server and i am not sure how to customize the PHP file so that I can use a different service. I’ve spent a few hours looking at other examples online but I can’t find any that use Actionscript rather than setting up the web services component using bindings.

If someone could point me in the direction of how I can customize the PHP to use the other web services it would be very helpful, I am pretty new to AS and coding in general.

Thanks guys,
Hectors