This example demonstrates a simple web page that uses PHP to manage a user greeting form through cookies. It shows how a name submitted via a form can be stored and displayed with a personalized message while controlling the visibility of the form and message sections. The page relies on PHP’s `setcookie()` and `$_COOKIE` to persist data across requests, and it redirects via `header()` after submission. The layout is built with custom CSS and a floating sidebar, though it contains no JavaScript libraries or charting frameworks.