(PHP 4, PHP 5)
session_unregister — Unregister a global variable from the current session
session_unregister() unregisters the global variable named name from the current session.
This function has been DEPRECATED as of PHP 5.3.0. Relying on this feature is highly discouraged.
The variable name.
Returns TRUE on success or FALSE on failure.
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.