logout.php

<?php

// Initialize the session.
// If you are using session_name("something"), don't forget it now!
session_start();

// Unset all of the session variables.
unset($_SESSION['sess_category']);
unset($_SESSION['sess_email']);
unset($_SESSION['sess_name']);

// If it's desired to kill the session, also delete the session cookie.
// Note: This will destroy the session, and not just the session data!
if (ini_get("session.use_cookies")) {
    $params = session_get_cookie_params();
    setcookie(session_name(), '', time() - 42000,
        $params["path"], $params["domain"],
        $params["secure"], $params["httponly"]
    );
}

// Finally, destroy the session.
session_destroy();
header('Location: login.php');
exit();

?>

<!-- ob_start();
session_start();
unset($_SESSION['sess_category']);
unset($_SESSION['sess_email']);
unset($_SESSION['sess_name']); -->