session_destroy не работает
//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 = [];).
<?php
$_SESSION = [];
session_unset();
session_destroy();
?>
Mohamed Sami khiari