问在PHP中正确防止会话劫持

EN

// **PREVENTING SESSION HIJACKING**
// Prevents javascript XSS attacks aimed to steal the session ID
ini_set('session.cookie_httponly', 1);

// Adds entropy into the randomization of the session ID, as PHP's random number
// generator has some known flaws
ini_set('session.entropy_file', '/dev/urandom');

// Uses a strong hash
ini_set('session.hash_function', 'whirlpool');

// **PREVENTING SESSION FIXATION**
// Session ID cannot be passed through URLs
ini_set('session.use_only_cookies', 1);

// Uses a secure connection (HTTPS) if possible
ini_set('session.cookie_secure', 1);

session_start();

// If the user is already logged
if (isset($_SESSION['uid'])) {
    // If the IP or the navigator doesn't match with the one stored in the session
    // there's probably a session hijacking going on

    if ($_SESSION['ip'] !== getIp() || $_SESSION['user_agent_id'] !== getUserAgentId()) {
        // Then it destroys the session
        session_unset();
        session_destroy();

        // Creates a new one
        session_regenerate_id(true); // Prevent's session fixation
        session_id(sha1(uniqid(microtime())); // Sets a random ID for the session
    }
} else {
    session_regenerate_id(true); // Prevent's session fixation
    session_id(sha1(uniqid(microtime())); // Sets a random ID for the session
    // Set the default values for the session
    setSessionDefaults();
    $_SESSION['ip'] = getIp(); // Saves the user's IP
    $_SESSION['user_agent_id'] = getUserAgentId(); // Saves the user's navigator
}