The PHPSW website used to be a clunky Silex app that I wrote back when I ran PHP South West UK in 2015. I don't know how it works anymore, but it used to grab data from Meetup and Twitter and cache it in Redis. It kind of worked. Sometimes it worked.
Silex end of lifed in 2018, and Tom Adam has since rewritten the site in Symfony 5 🙌️
Most of what I wrote is gone (thankfully!) but do check out the animated SVG balloon elephants that I am still very proud of.