Recommended file permissions and owner

I've been having problems recently with people somehow planting PHP
scripts on my system and then sending spam. Luckily, PHP includes an email
header with the name of the script sending email. To stop this, I've
temporarily made me the owner of all the files and directories in phpwiki.
Now, I'd like to get stuff working again (so I can edit pages again). So,
what are the recommended owners and permissions of the various directories
and files?

THANKS!

Harold



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