Need help on PHP

[Badekdek]

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Where to put session start/destroy on a reservation system?
What's their purpose?

On w3schools, it's quite confusing how they discuss on the matter.

(Typical client login/logout, make/cancel/view reserve)
My purpose is that if a client logins, he/she cannot be promted to login again if he/she clicks the back browser button.

if nasayop q thread sorry x[
figuring how to delete this thread.

[vern]

If he/she clicks back, that copy is served from a local cache, not from the server.