What are the potential security risks associated with using generated numbers for login cookies in PHP?

Using generated numbers for login cookies in PHP can pose a security risk if the generated numbers are not sufficiently random. If the numbers are predictable, attackers may be able to guess or brute force the cookie values, gaining unauthorized access to user accounts. To mitigate this risk, it is important to use a secure random number generator function in PHP, such as random_int(), to generate unpredictable values for login cookies.

// Generate a secure random number for the login cookie
$randomNumber = random_int(100000, 999999);
setcookie('login_cookie', $randomNumber, time() + 3600, '/');