What potential pitfalls should I be aware of when setting and accessing cookies in PHP?

One potential pitfall when setting and accessing cookies in PHP is not properly sanitizing user input, which can lead to security vulnerabilities such as cross-site scripting attacks. To mitigate this risk, always validate and sanitize any user input before setting it as a cookie value. 

// Sanitize user input before setting it as a cookie value
$user_input = filter_var($_POST['user_input'], FILTER_SANITIZE_STRING);
setcookie('user_cookie', $user_input, time() + 3600, '/');

Keywords

cookies PHP setcookie $_COOKIE security

Related Questions