RE: [PHP] Logged Out of Seesion, Then use back button

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1) How can I prevent the use of the browser "back" button after someone
logs out?
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Set a cookie on login, unset the cookie on logout. Check for cookie, if
it doesn't exist display login mechanism.

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2) If, after a user has attained step 3, they use their back button to
change a variables value in step 2, the new value is never saved by the
session and their original entry is used in the email. How can I adjust

for people using their "back" buttons during the individual steps of the

script?
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You would have to disable the back button.

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3) Should the header calls appear before the session_start or after?
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before