php – Page 20 – Türker Yıldırım

Serialising an enum, and the case that was renamed

NoteNovember 15, 20222 min read

serialize on a pure enum stores the case name, and on a backed enum stores the value, which makes the two behave differently across a rename. Native serialisation…

A queue worker that scales on the metric that matters

Deep diveNovember 9, 202210 min read

Six workers, always, whether there is work or not. A backlog at 09:00 and idle capacity at 03:00.

array_is_list, and the JSON object you did not mean to send

NoteNovember 9, 20222 min read

An array that was a list and had an element removed is no longer one, and json_encode silently emits an object instead of an array. This reaches a…

An idempotent consumer for a broker that redelivers

Deep diveNovember 8, 202210 min read

A message processed twice, and a customer charged twice. At-least-once delivery, treated as exactly-once by the handler.

realpath_cache_size, on a bind-mounted volume

NoteNovember 8, 20221 min read

Every file resolution is a stat, and on a bind mount each one crosses a filesystem boundary — which is why this setting matters most where it is…

Two teams, one database, and the schema change that needed a meeting

Deep diveOctober 29, 202210 min read

A shared schema, and a rename that took three weeks to coordinate. Table ownership that exists in nobody’s head.

opcache.jit is on and your web request is unchanged

NoteOctober 19, 20221 min read

The JIT compiles hot code paths to machine code and helps almost nothing in a typical web request, where the time is in I/O. Reporting a benchmark improvement…

A cache invalidation bug that only appeared under load

Deep diveOctober 17, 202210 min read

Correct in every test, wrong for about one request in four thousand. A read that races a write, and a cache that keeps the loser.

Enum constants are implicitly final

NoteOctober 6, 20222 min read

An enum cannot be extended, so every constant on it is final by construction and the keyword is redundant rather than forbidden. A constant whose value is a…

A monorepo for four packages and one application

Deep diveOctober 5, 202210 min read

Four packages, four repositories, and a change that spans three. A version bump dance that takes an afternoon.