2 questions there.
1st:
current page: $_SERVER['PHP_SELF']
previous page: $_SERVER['HTTP_REFERRER']
2nd:
Having a status check on every page is standard design. The best design is not to send your peeps to a different page, and then send them back, but rather include a file that does the checking, and processing.
Let me give you an example. On my site, I have a file that is included on every page before anything else (because of the issue with sending header()'s). This page looks for cookies, and will send cookies if I tell it to.
On "member only" sections of the site, I merely include another file. This second file checks the data gathered in the first file, and checks the db to see if they have appropriate permissions. If they do, the rest of the page displays. If they do not have the cookie, or are not in the database, then the page displays a form for them to log in with, and kills the rest of the page (see die() ).
The form they are given has the action=$_SERVER['PHP_SELF']. The first file then processes the information, sends a cookie, and then sends a header("Location:" . $_SERVER['PHP_SELF']); No matter what page they are at, all the processing is done on that page, and they have never actuallly left it. Make sense? My script is actually more complicated than this, but you get the concept.
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