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, either a new identifier is allocated, or the user is re-associated with one that was already established in a previous visit. Any variables that have been associated with the session will become available to your code through the $_SESSION superglobal.

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.



Sams Teach Yourself PHP MySQL and Apache All in One
Sams Teach Yourself PHP, MySQL and Apache All in One (4th Edition)
ISBN: 067232976X
EAN: 2147483647
Year: 2003
Pages: 333
Authors: Julie Meloni

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