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Named arguments make parameter names public API

NoteDecember 8, 20202 min read

A method with six optional parameters produced calls full of nulls to reach the seventh, and naming them fixes the call site at the cost of freezing every…

The JIT helps a benchmark and not a web request

NoteDecember 4, 20201 min read

The JIT is the headline of 8.0 and is close to irrelevant for a typical web application, which is worth saying before somebody spends a week on it.…

The JIT is on and your web request is unchanged

NoteDecember 3, 20202 min read

The JIT is the headline of 8.0 and it is close to irrelevant for a typical web application, which is worth saying before somebody spends a week on…

Allocation in a loop, and the profiler that shows it

NoteDecember 3, 20202 min read

A CPU profile shows where time is spent and not why, and a loop constructing an object per iteration frequently spends its time in the allocator rather than…

SplFixedArray, and the million-element array that halves

NoteNovember 19, 20201 min read

A PHP array is a hash table even when the keys are 0 to n, and for a large numerically indexed list that overhead is most of the…

Preloading is a restart, not a cache warm

NoteNovember 19, 20201 min read

Preloaded files are compiled once at server start and are fixed until php-fpm restarts, which makes a deploy a restart rather than a reload. A restart drops in-flight…

Http::fake, and a test that never touches the network

NoteNovember 17, 20202 min read

Testing code that makes an HTTP call meant injecting a mock client, which means the code had to accept one — so the test shaped the design rather…

Enum-like class constants, and the three things they cannot do

NoteNovember 14, 20202 min read

Enums are 8.1, so a set of allowed values in 2020 is class constants with a validating constructor — and the gaps are worth naming rather than discovering.…

Profiling before you optimise

Deep diveNovember 5, 202010 min read

Two days spent optimising a function that was 3% of the request. The profiler said so in ninety seconds, and nobody had run it.

The migration that squashed two hundred files

Deep diveNovember 5, 20209 min read

A test suite spending ninety seconds replaying six years of schema history. Squashing is a good idea with two failure modes worth knowing first.