javascript - Log out restriction in php -

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i making website using javascript , php.

when user logout website , if clicks button of browser goes previous state in user logged in.

1. how can restrict this?

2. can done sessions, or else?

use sessions

login.php:

... $_session["foo"] = $foo; ...

logout.php:

... unset($_session["foo"]); ...

in login.php set sessionvariable named foo (so user logged on). when logs out, destroy/unset sessionvariable named foo, in each logged in page may want if statement checking if session variable set(logged in) else (not logged in) can redirect user ever want to.


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