session_unset — Unsets all variables.
Unsets all variables associated with a session. This is
not the same as session_destroy() as it
still maintains the session state
Existing since version 4.0
Example 1169. Unregister all
PHP Functions Essential Reference. Copyright © 2002 by New Riders Publishing
(Authors: Zak Greant, Graeme Merrall, Torben Wilson, Brett Michlitsch).
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