Jordi KroonPersonal site of Jordi Kroon. DevOps and backend engineer based in the Netherlands, official maintainer of the PHP documentation, open source advocate.https://jordikroon.nl/enThe PHP manual should be the source of truthhttps://jordikroon.nl/blog/maintaining-php-docs/https://jordikroon.nl/blog/maintaining-php-docs/On the work behind the PHP manual: PR review, issue triage, writing the PHP 8.5 entries that don't exist yet, and how to help.Wed, 13 May 2026 12:00:00 GMTphpopen-sourcedocumentationHello, world. A canonical home for the writing.https://jordikroon.nl/blog/hello-world/https://jordikroon.nl/blog/hello-world/Why I built a personal site, what runs it, and why my writing lives here now instead of on Medium or anywhere else.Wed, 13 May 2026 00:00:00 GMTmetaopen-sourceHow we upgraded the engine behind RacingNews365https://jordikroon.nl/blog/racingnews365-engine-upgrade/https://jordikroon.nl/blog/racingnews365-engine-upgrade/In 2019 we rebuilt the caching layer behind a 17M-visitor Formula 1 site. Varnish ESI, surrogate keys, randomised cache-control, central cache-config. Notes from the rebuild.Thu, 16 May 2019 00:00:00 GMTphpcraft-cmscachingvarnishperformance