Best way to filter (validate) rescued $_SESSION data

Question

I am creating a register and I have a session $_SESSION['usuario']['cpf'];

I am validating the data I receive by POST and GET with the function filter_input PHP. However, the documentation says: INPUT_SESSION (not implemented yet). In this case. how should I securely validate my rescued data from a Session for a Registration?

Answer 1

One of the ways to validate is to make use of the function filter_var.

Simply assign the session value to a variable and pass it to the function or pass the session you want to validate directly to the function.

More details here http://php.net/manual/en/function.filter-var.php