#HugOps to Steam’s engineers. Christmas Eve is not a great day for your store, community, and API to be down. 😬
I’m looking more into the steamstat.us site, and it’s developed and maintained by https://steamdb.info, which is a completely ad-free, independent database of everything in Steam, maintained as a hobby project for about 13 years. They have a lot of really interesting tools and information about how they gather the data from Steam, and under their technology attribution FAQ, they list “latest PHP.”
https://steamdb.info/faq/#attribution-and-technologies-we-use