Description:
------------
As far as I can see, the MODE option (for setting file permissions) on 
session.save_path is only mentioned in the sample php.ini, but is not actually 
documented anywhere else (i.e. on 
<http://www.php.net/manual/en/session.configuration.php#ini.session.save-path>).

The php.ini describes the following format:

"N;MODE;/path"

This is a problem for anyone using an existing php.ini that might not mention this 
feature, but that needs it.


Expected result:
----------------
Please add this to the documentation as described.