Thirdplace Discovery is a feed (RSS) discovery service.
You insert a URL and it tries to find a feed for it.
Enter URL:
Search results for "https://reddit.com/r/php":
This feed contains subreddit submissions.
Url: https://www.reddit.com/r/php.rssFollow in Feedly
Follow in Inoreader
Follow in Feedbin
Follow in The Old Reader