[basic php] loadvars trouble

I’m sorry, as I’m sure this has been posted a million times before, but I’ve read other posts & done a few tutorials and I just can’t get the hang of this.

All I want to do is pass a variable from a php script to a flash movie. My flash code is as follows:

 
var vars = new LoadVars();
vars.onLoad = function(success)
{
	for(var prop in this ) 
	{
		trace ("key " + prop + " = " + this[prop]); 
	}
}
vars.load("c.php");
 

and the php script is just:

<?php
echo "hello=blah";
?>

thanks, and I’m sorry for such a basic question, I just can’t see why this doesn’t work. (the .fla and .php are both in the same directory)