The HTTP 303 See Other status code tells the browser that the response for the request can be found at a different location, wheres the new location should be provided in the location header.
Below is an example of how the 303 See Other redirect would look.
HTTP/1.1 303 See Other Location: http://brugbart.com/
Below is an example of how to deliver the above message with PHP:
header('HTTP/1.1 303 See Other'); header('Location: http://brugbart.com/');