accessing level above $_SERVER['DOCUMENT_ROOT']

hi, I have this structure: /home/lamp/mydomain/html /home/lamp/mydomain/logs /home/lamp/mydomain/config etc. html directory is the only one accessible from outside. to access config file I can use this: required_once('/home/lamp/mydomain/config'); but this is the structure on my local/development machine. once the site is done it will be moved to "production" server and the structure will be /srv/www/mydomain/html /srv/www/mydomain/logs /srv/www/mydomain/config etc. to "automate" the document_root I define on the begining of the page define('HTML_PATH', $_SERVER{"DOCUMENT_ROOT']); define('CONFIG_PATH', $_SERVER{"DOCUMENT_ROOT'].'/../config'); define('LOGS_PATH', $_SERVER{"DOCUMENT_ROOT'].'/../logs'); it works but I think it's not good solution. or at least - it's not nice solution :-) suggestions? afan