        $rndString = function ($len = 10) {
            $characters = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
            $randomString = '';
            for ($i = 0; $i < $len; $i++) {
                $randomString .= $characters[rand(0, strlen($characters) - 1)];
            }

            return $randomString;
        };
The software uses insufficiently random numbers or values in a security context that depends on unpredictable numbers.