PHP Pass variable to next page

It seems pretty simple but I can't find a good way to do it. Say in the first page I create a variable $myVariable = "Some text"; And the form's action for that page is "Page2.php". So in Page2.php, how can I have access to that variable? I know I can do it with sessions but I think it's too much for a simple string, and I do only need to pass a simple string (a file name). How can I achieve this? Thanks!