title: How to make each computer only upload 3 images per day? (using PHP)
body: <p>I'm building an image-uploading website. One of the limitation is that each computer user can only upload 3 images per day. I prefer not to use both session and cookie, because if the user close the browser, the session will destroy; the user can also remove the cookie through the browser setting. So is there any better idea to achieve this limitation?</p>