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I have a site, with a small admin area. The admin area needs to write to a directory, but dont want to give write access to that directory to the group or for anybody else (for security reasons). How can I change the owner of the directory (and subdirectories) to the runing user?
Your PHP program will run with a fixed user id as far as the operating system is concerned. The OS does not know who is accessing the website.
What you need to do is give permission to write files to the user that PHP is running under, and then trust the PHP code to only act on behalf of who it considers to be admin users.
The best you can (and should) do on the OS level is to lock down other parts of the filesystem, so that an error in the PHP cannot cause anyone to get to files outside of this admin area.