(PHP 4, PHP 5 < 5.4.0)
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 and REMOVED as of PHP 5.4.0.
The variable name.
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.