Secure upload in php [closed]

I have flash games website. In my panel I already made the “upload game” page, that you can insert the data about the game. Now, I have to upload image, and swf file, how should I do that secure?

Please tell me about the checks that I should do (for image and for swf).

And if there is any anti virus that working with php, please tell me about it.

Thanks people.