How can PHP developers ensure the security of cookies in their applications?

PHP developers can ensure the security of cookies in their applications by setting the 'secure' and 'httponly' flags on the cookies. The 'secure' flag ensures that the cookie is only sent over HTTPS connections, while the 'httponly' flag prevents the cookie from being accessed by JavaScript, thereby reducing the risk of cross-site scripting attacks.

// Set a cookie with the 'secure' and 'httponly' flags
setcookie('cookie_name', 'cookie_value', time() + 3600, '/', 'example.com', true, true);