file vs. directory permissions

(not sure if this is an apache question or not...)

I have a php script that overwrites text files. each file must have read and write permssion.

The server I am working with is Apache on FreeBSD. currently the directory containing the text files has permission

rwxr-xr-x (755)

and one of the text files I use for testing my script is

rw-r--rw- (646)

is there a way to set server permissions so that all files within a directory have read and write permission rather than manually setting each file to 646?

-R

Chmod that dir to 757 and files to 646.

Or:

Chmod the dir to 755 and chown the files to be owned by nobody with a permission of 644.