Making sure Photos are unique?
My website allows a user to upload a photo of him/herself, and then it creates a thumbnail which can be used for their Profile Thumbnail.
Is there some way to make sure two different users don't upload the same image? (For example, I'm not crazy about the idea of having 20 users who all have Erin Andrews *bimbo* as their Profile Thumbnail - if you follow me?!)
Oh, BTW, my "upload.php" script take a file, goes through numerous checks to ensure it is a valid photo (i.e. .jpeg, .gif, .png) and then uses GD to sanitize things further.