Fun fact: to this day you still cannot have request parameters with “.” in them, because a dot is not valid in a variable name—even though register_globals was

Fun fact: to this day you still cannot have request parameters with “.” in them, because a dot is not valid in a variable name—even though register_globals was removed several major versions ago. The value of a form input with the name “foo.bar” will instead be available under $_POST[“foo_bar”].