Reading flash cookie

[eluser]aryan_[/eluser]
How can I read flash cookie?

I'm using this code to create a cookie:

Code:

user = SharedObject.getLocal("user");
user.data.signedup = true;
user.flush();

and, accessing it using php:

Code:

$x = $_COOKIE['signedup'];

But, unable to access. It throws an error:
Message: Undefined index: signedup

How should I access the cookie created? Please help.