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Session Function Overview
Session functions provide a unique identifier to a user, which can then be used to store and acquire information linked to that ID. When a visitor accesses a session-enabled page, she is either allocated a new identifier or re-associated with one that was already established in a previous access. Any variables that have been associated with the session will become available to your code through the $_SESSION superglobal.When you use sessions, cookies are used by default to store the session identifier, but you can ensure success for all clients by encoding the session ID into all links in your session-enabled pages.Session state is usually stored in a temporary file, although you can implement database storage using a function called session_set_save_handler(). The use of session_set_save_handler() is beyond the scope of this book, but you can find more information at http://www.php.net/session-set-save-handler.
