[support] anonomous users and $_Get variables

Hello,

We are having some trouble with using $_Get variables in Drupal with anonymous users. We have several pages using PHP input that take a variable from the query string.

For example:

echo $_GET['myvar'];

For anonymous users, the GET variables sent in the query string are ignored, so the above code would not print anything. The strange thing is that this works fine for an authenticated user, i.e. if you are logged in the above code will print the value of myvar= sent in the query string.

Any ideas as to why this is happening and how to allow GET variables to work for anonymous users?

Thanks in advance,