(PHP 4, PHP 5 < 5.4.0)
session_unregister — Unregister a global variable from the current session
session_unregister ( string $name ) : bool
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.
name
The variable name.
Returns true on success or false on failure.
Note:
If $_SESSION 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().
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https://www.php.net/manual/en/function.session-unregister.php