How can one properly choose a secure cookie key in PHP?

To properly choose a secure cookie key in PHP, it is recommended to use a randomly generated string with high entropy to prevent brute force attacks. This key should be unique for each application and stored securely. Additionally, it is important to regularly rotate the cookie key to enhance security.

$cookieKey = bin2hex(random_bytes(32)); // Generate a random 32-byte key
setcookie('secure_cookie_key', $cookieKey, time() + 3600, '/', '', true, true); // Set the secure cookie key with HttpOnly and Secure flags