When the Facebook session expires with my App, I have to use the Javascript SDK to create a new session. This is hugely annoying as it appears to the user that they are logged out occasionally as I do most of the detection server side. And then, when they reload the page and the javascript has executed, the session is recreated.
I am aware that I can fix this quite simply by using javascript to show a message saying ‘please reload the page’ (much like StackOverflow), however, I do not want my users to have to do this. I accept that the PHP SDK cannot do it, but is there any sort of hack I can do to achieve it myself using PHP instead of Javascript?
Can anyone explain why the PHP cannot do this?
PHP is running on your server, which has nothing to do with Facebook’s servers. Remember that cookies are locked to the originating domain. The cookie will appear to have been set by YOUR server, and have an originating domain of “yoursite.com”, not “facebook.com”.
JS, on the other hand, runs on the client, and any requests made to Facebook’s servers will also obey any cookies set by the Facebook servers.