stream_socket_server()

I've noticed that there are many functions lately on php.net that when I try to use them locally I get

Fatal error: Call to undefined function: function_name() in d:\web\apache\htdocs\test\test.php on line 3

Why is it doing this? I'm using version 4.3.2
I've had this happen with:

stream_socket_server()
socket_get_status()

And so on. Anyone know why? Some say they are experimental but not all.:confused:

Do you have PHP compiled with sockets enabled?

I do now ;)

But I keep getting errors & what not playing with those functions so I think I'll leave it alone.