Any Flash developer who has worked on RIAs (Rich Internet Applications) that needed to interact with PHP knows that this isn’t a simple process at all. While in the past the only two options to send and load data from PHP were LoadVars and XML, AMFPHP looks to simplify the process from the server and the client side.
Imagine writing a function on the server that queries the database and returns an array, then calling that function via Actionscript to retrieve your data. This pretty much sums up what AMFPHP does. It eases the complexity when dealing with loads of data. Read more on AMFPHP.