How to safely read/write .ini file from server?

How can this be accomplished? I need a user's save file to be stored on my website/server space. It needs to be saved/loaded periodically in my program frames but not at all times.

Is there a way to do this safely without it being hijacked? Can this be done quickly enough to not cause issues?

I appreciate any help.

I think the safest method is to use the GET object and store the data in a mySQL via a PHP script on your server.
You can also encrypt the data it using AES Fusion extension then decrypt it on your server for processing/saving.

Thanks for the response. I'll start looking into how to do this