What are some considerations for implementing a secure logout functionality in a PHP login system to ensure user sessions are properly managed?

To implement a secure logout functionality in a PHP login system, it is important to unset the user session variables and destroy the session cookie to ensure that the user is completely logged out and their session is properly managed. 

session_start();

// Unset all session variables
$_SESSION = array();

// Destroy the session cookie
if (ini_get("session.use_cookies")) {
    $params = session_get_cookie_params();
    setcookie(session_name(), '', time() - 42000,
        $params["path"], $params["domain"],
        $params["secure"], $params["httponly"]
    );
}

// Destroy the session
session_destroy();

Keywords

session management CSRF token session hijacking PHP session functions logout functionality

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