php – Page 23 – Türker Yıldırım

Block locking is per block, not per template

NoteJune 21, 20221 min read

6.0 adds a lock attribute on individual blocks, which sits between templateLock on a container and no restriction at all. The two flags are independent, so a block…

static::class inside a trait resolves to the using class

NoteJune 9, 20222 min read

A trait is copied into the using class at compile time, so self, static and __CLASS__ all refer to the class rather than to the trait. This is…

client_max_body_size, and the upload that 413s

NoteJune 6, 20222 min read

Four separate limits govern an upload and the error message names only the one that fired, which is usually not the one you changed. The PHP limit failing…

The queue table that became a bottleneck at four million rows

Deep diveJune 3, 202210 min read

A database-backed queue that worked for four years. SELECT FOR UPDATE SKIP LOCKED, and a lock wait timeout.

The report that ran on a replica and was three minutes stale

Deep diveMay 31, 202210 min read

Read routing added for capacity, and a report that disagreed with the dashboard. Two numbers, both correct, three minutes apart.

Style variations, and the theme that ships four designs

Deep diveMay 18, 202210 min read

6.0 in May, and styles/ as a directory of theme.json fragments. Four client sites that differ only in colour and type.

An SLO that survived contact with the business

Deep diveMay 17, 202214 min read

99.9% was written in a document in 2020 and had never been measured. Three teams with three definitions of “up”.

PHPStan level 9 is about mixed, and it is a project

NoteMay 10, 20222 min read

Level 9 requires every mixed to be narrowed before use, which is a different order of work from level 8. Every boundary that decodes JSON, reads a configuration…

Reading a container’s real CPU quota before sizing a pool

NoteMay 8, 20222 min read

nproc reports the host’s cores, so a worker pool sized from it starts thirty-two processes in a container entitled to two. The arithmetic is integer division, so a…

hash_equals for anything that arrived in a request

NoteApril 28, 20222 min read

String comparison short-circuits on the first differing byte, which leaks how much of a secret an attacker has guessed. The argument order is the detail that is almost…