Session Notes ------------- To unset a session variable ... unset($_SESSION['count']); To delete a session variable ... session_unregister('count'); Cookie Notes ------------ Setting a cookie Browser -> Server: web browser requests a web page from server, no cookie GET /index.html HTTP/1.1 Host: www.example.org Server -> Browser: servers asks web browser to store a cookie http://1.1 200 OK Content-type: text/html Set-Cookie: name=value ... Browser -> Server: web browser, now aware of the cookie, includes it in next page request GET /spec.html HTTP/1.1 Host: www.example.org Cookie: name=value Accept: */* More information ... http://en.wikipedia.org/wiki/Session_cookie http://php.about.com/od/learnphp/qt/session_cookie.htm http://biorust.com/tutorials/detail/100/en/ http://www.php-learn-it.com/php_cookies.html http://www.bcbstx.com/search/faq-cookies.htm