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session_is_registered
Find out whether a global variable is registered in a session
(PHP 4, PHP 5)
bool session_is_registered ( string name )
Return Values
session_is_registered() returns TRUE if there is a
global variable with the name name registered in
the current session, FALSE otherwise.
Notes
Note:
If $_SESSION (or $HTTP_SESSION_VARS
for PHP 4.0.6 or less) is used, use isset() to check a
variable is registered in $_SESSION.
Caution:
If you are using $_SESSION
(or $HTTP_SESSION_VARS), do not use
session_register(),
session_is_registered() and
session_unregister().