really simple problem with GET

Hi, I am sorry if the level of this question is too simple but I can't figure out what's wrong. I want to pass a variable value through the URL using the Get method. FOr example http://......./test.php?$test=0 and my test.php code are as follow: <html> <body> <?php if (!empty($_SERVER)) extract($_SERVER); if (!empty($_GET)) { extract($_GET); } else if (!empty($HTTP_GET_VARS)) { extract($HTTP_GET_VARS); } if (!empty($_POST)) { extract($_POST); } else if (!empty($HTTP_POST_VARS)) { extract($HTTP_POST_VARS); } echo "hello $test"; ?> </body> </html> BUt my outcome is hello so therefore my $test variable isn't passing through, does anybody know what I did wrong? Thanks Kelvin