I have a form that reloads the page with the updated data:

<form name="form" method="post" action="<?php echo $_SERVER['PHP_SELF']; ?>">
    ...
    <input type="submit" name="Submit" value="Update data">
</form>

When the page is updated I want to display a message "Data updated". There was something like this with Referer I beleve, but can't remember.

btw I am also using:

if (isset($_POST['Submit'])) {
    // prevent resending data
    header("Location: " . $_SERVER['PHP_SELF']);
}

to avoid the annoying resending data message when the user clicks the back button. Is this correct?