title: What should be written in callback file of Superfeedr?
body: <p>I need to generate RSS feed and get title and urls of the posts and so on. I decided to use <a href="http://superfeedr.com" rel="nofollow">Superfeedr</a> for it. So in this situation, I'm a subscriber in Superfeedr. There is callback (the subscriber URL) field to get data, but I don't know what should be written in callback file. I researched the net for example code, but I found nothing about example code. BTW, I want to do this process in PHP. So if you know what should I need write to this file, please comment.</p>