I need to generate RSS feed and get title and urls of the posts and so on. I decided to use Superfeedr 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.
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