Logout login HTML and PHP, how to solve

Log off the login HTML with PHP

You are welcome

Logout and other clicks, jump to the login screen and log off session
unset ($_session[' login ');
Session_destory ();
?>
Where should I put this part?

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Session_Start ();
unset ($_session[' login ');
Session_destory ();
................
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On the target page of the logout, of course.
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To unregister a connection address
Cancellation
Write in unset.php
unset ($_session[' login ');
Session_destory ();
?>

------Solution--------------------
Where the conversation is to be used, the beginning must be Session_Start ()

Does the session still exist when you click Back to student.php on page a? Will exist

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