What are some potential security risks associated with using cookies in PHP scripts?

One potential security risk associated with using cookies in PHP scripts is the possibility of cookie manipulation by malicious users. To mitigate this risk, it is important to sanitize and validate cookie data before using it in your script. Additionally, you should consider setting the HttpOnly flag on your cookies to prevent client-side scripts from accessing them.

// Sanitize and validate cookie data
$cookie_value = isset($_COOKIE['cookie_name']) ? filter_var($_COOKIE['cookie_name'], FILTER_SANITIZE_STRING) : '';

// Set HttpOnly flag on cookies
setcookie('cookie_name', $cookie_value, time() + 3600, '/', '', true, true);