Updating file with web form

[eagled2]

I am designing a site that will have several variables used on multiple pages and would like to create a settings page that allows an admin to update the value of these variables that are saved in a php file. I was thinking of using fwrite to update the values in the settings php file directly. From what i've read on fwrite it sounds like this is possible but I am wondering if there is a security risk in doing it that way and if so what a more secure solution would be.

[architact]

Instead of importing variable values from file why don't you import values from database it will be easy to edit their values from admin panel.

[eagled2]

Ya i could do that easy enough. I guess it wouldn't really save that much database connection anyway.