What does this get?

Question

$code = $_POST['code'];

Answer 1

At this time you can print out all the values ​​of $_POST, and you can see it at this time. Of course, you can also print out the value of $_REQUEST.

$_REQUEST includes the values ​​of $_POST and $_GET. All values ​​in both states

Answer 2

Get the value named "code" in the form control and assign it to $code;