PHP settings, Reading from $_GET['variablename']

[locust]

Are there any special settings i need to set in PHP
to allow me to read this value
It works on windows xp but when i try use it on a linux
i get nothing
Help!

[firepages]

what version of PHP is your linux box running ? if its <4.1.* you won't be able to use $_GET[] etc, though $HTTP_GET_VARS will still be available