[Resolved] Global Constants?

[Napster]

I am trying to get this code to work...

  ##### User #####

  $uz0rid = $_COOKIE['user_id'];

  define("USER_ID", $uz0r_id);



  ########## Functions ###########

  function is_logged() {

global USER_ID;


if (empty(USER_ID)) return 0;

else return 1;

  }

I am getting an error on the part where it says

global USER_ID;

Saying it is expecting a $ or something like that. How can I get this to work?

[Napster]

I figured it out now, you do not need to do that with constants. Though I am wondering why I can not go:

if (empty(USER_ID)) return 0; 

[TimTimTimma]

the correct way to check if a constant is defined is

<?php
if(defined("CONSTANT_NAME")){
//code here
}
?>