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session_unregister
Unregister a global variable from the current session
(PHP 4, PHP 5)
bool session_unregister ( string name )
session_unregister() unregisters the global variable named name from the current session.
Notes
If $_SESSION (or $HTTP_SESSION_VARS
for PHP 4.0.6 or less) is used, use unset() to
unregister a session variable. Do not unset()
$_SESSION itself as this will disable the special
function of the $_SESSION superglobal.
This function does not unset the corresponding global variable for name, it only prevents the variable from being saved as part of the session. You must call unset() to remove the corresponding global variable.
If you are using $_SESSION (or
$HTTP_SESSION_VARS), do not use
session_register(),
session_is_registered() and
session_unregister().