There is an interesting thread in Flash-DB which is discussing the various possibilities of passing data to flash from PHP. The attractive part in that to me is using AMF(Action Message Format – binary format for sending Flash Objects) with PHP.
Musicman has come out with this PHP class which can construct the AMF data. Alessandro(sephiroth) has put a sample application using this class.

What I fore see is by combining Nik Kilani’s xml based PHP remoting solution (by taking the code which calls the PHP functions and converts the result into XML data, and changing it to serialize it as AMF data) we can make the PHP Flash Remoting Dream come true. 🙂