No Flash player will communicate with a server.
However, using the ActionScript function loadVariables, with the optional method argument will first send the variables to the page listed in the URL argument. The URL argument must be a local file.
Here is the PHP manual way of describing loadVariables()...
loadVariables ( string URL [, string target [, string method]])
URL = path to the page with variables, must be local file
target = either the standard set (blank, top, _parent, etc.) or a name
method = GET or METHOD only, when used the variables are first sent then returned.
On the local php file, you recieve the GET or POST variables, process them then return them accourding to the loadVariables() function. It would probably be better to say the loadVariables() method.
BTW, this is more of a Flash communication issue than a php issue, which is why I mentioned going to UltraShock or We're Here. There are more people there that could help you.
HTH