You\'ve probably most likely used php.ini-recommended file didn\'t you? Well if you did then the global variables defined in the older PHP variables are set to off. Use the new arrays PHP has defined for you to pass variables using GET or POST methods. The same thing applies to COOKIES and Server variables. For instance if I type this address.
http://my.server/test.php?greeting=Hello
--test.php--
<?php
print(\"$_GET[greeting]\");
?>
--test.php--
This would then print \"Hello\" like it should.
Refer to the manual and the change list on http://www.php.net homepage.