Why is PHP session_destroy() not working?

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I tried to destroy all session variable by using the session_destroy() method, but after using this method, the values are not destroyed.

Why is session_destroy() not working?

Is there any other way to destroy the session in PHP?

if (isset($_SESSION['LAST_ACTIVITY']) && (time() - $_SESSION['LAST_ACTIVITY'] > 1800)) 


After using session_destroy(), the session is destroyed behind the scenes. For some reason this doesn’t affect the values in $_SESSION, which was already populated for this request, but it will be empty in future requests.

You can manually clear $_SESSION if you so desire ($_SESSION = [];).

Source: stackoverflow