redirection question

Perhaps this is not the best design right now in my php script, but I've
just started with php after a long break.

The thing is that I enter a page called foo1.php, this script do some
calculations and should then send directly send the user to a page called
foo2.php together with the variables $bar and $bar2.

On the page foo1.php there will be no input or any clicking required by the
user. Just as soon as the values are calculated, it should continue.
How can I achieve this?
.