缓存Facebook / Twitter个人资料图片

Question

I want to let the users upload their facebook/twitter profile picture as an avatar. I insert a record with their token/secret in the DB. I've made a script that gets the user's id and displays the profile image using readfile() but I want to cache this image for 30 minutes. Is this possible with codeigniter?

Answer 1

Although not codeigniter specific.. On a site I created - when the user logs in with facebook, we download the file using something similar to file_get_contents.. we then store our local reference to it along with a MD5 of the image data.. This allows us to easily check whether we need to update our local store when the profile is next requested (this does require the server to re-download from facebook)

In other instances, we store the file size that facebook reports, so that we can do a HTTP HEAD request to check easily if its changed (I realise size doesn't have a direct relationship to the image changing.. however 99.9% of the time its a good indication.