[PHP] Variable over url

[Manuel Jenne]

Hi,
 
I've just installed php 4.2.3 and wonder why I can't submit an variable
over url.
 
Example:
 
My Script:
Test.php
 
<?
echo $tmp;
?>
 
My URL:
www.some.domain/test.php?tmp=5
 
My result:
 
NOTHING !!!
 
Where is the error?
 
P.S. phpmyadmin run ok.
 
 
Thanx
 
Manuel