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Named arguments through an interface are a gamble

NoteFebruary 11, 20212 min read

PHP does not require an implementation to use the same parameter names as the interface it satisfies, so a named argument through an interface type is only as…

SplObjectStorage as a set, before WeakMap existed

NoteJanuary 27, 20212 min read

SplObjectStorage is a set of objects with O(1) membership, and it holds a strong reference to everything in it. It is genuinely the right tool for cycle detection…

A value object is not an entity and the difference is identity

NoteJanuary 14, 20212 min read

Two entities with identical fields are different things; two value objects with identical fields are the same value. The practical consequence is that value objects need no table,…

Union types, and the ones that still cannot be expressed

NoteDecember 29, 20202 min read

A method returning either a Product or an Error had no signature that said so, and the docblock describing it was checked by a static analyser and by…

Named arguments and attributes change how a framework is written

Deep diveDecember 29, 202010 min read

Two 8.0 features that look like syntax and are not. One makes optional parameters part of the API; the other makes docblocks executable.

An attribute is a class, and reading one is reflection

NoteDecember 23, 20202 min read

Docblock annotations were parsed from a comment by a library, which meant a typo was silent and an IDE could not help. An attribute is a real class…

The nullsafe operator, and where it hides a bug

NoteDecember 23, 20202 min read

A chain of null checks reads badly and the operator that replaces them is genuinely better — and it makes one specific mistake easier to write. Short-circuiting the…

Stringable, and the interface PHP had been implying

NoteDecember 21, 20201 min read

A parameter accepting “a string or something that becomes one” had no type to express it, so it was either untyped or the caller had to cast. The…

Union types, promotion, and match

Deep diveDecember 18, 202015 min read

8.0 shipped in November with three changes that alter how a class is written, and a fourth that quietly breaks string-to-number comparison.

Constructor promotion, and the value object that is four lines

NoteDecember 11, 20202 min read

A value object was a property declaration, a constructor parameter and an assignment for every field — three lines each, all of them saying the same thing. The…