I've just installed plogger on my website and I noticed that my DB password appears clearly in plog-config.php. Is there a way to hide it in the file ??
there is no reason to hide the file - the php code will not be sent to browser if your server is set up correctly.
If your server has php and is set up correctly then an end user should never see the DB password listed in that file. load the config page directly in your browser and view source. You will not see any php code - the code will not be passed on to the browser and is only use server side.