What are the potential pitfalls of using $_REQUEST with cookies?

Using $_REQUEST with cookies can pose a security risk as it combines data from both $_GET, $_POST, and $_COOKIE arrays, making it vulnerable to injection attacks. To mitigate this risk, it is recommended to use $_COOKIE directly when working with cookies to ensure data integrity and security.

// Accessing cookie data directly using $_COOKIE
$cookieValue = $_COOKIE['cookie_name'];