oop – Page 23 – Türker Yıldırım

A TypeError is something you can now catch

NoteMarch 30, 20161 min read

Passing a string where an object was hinted used to be a recoverable fatal, which in practice meant an unrecoverable one. It is an exception now, which makes…

Scalar type declarations are a per-file decision

NoteFebruary 15, 20162 min read

PHP 7 added scalar type hints and then made them optional in a way that surprises people: without declare(strict_types=1) the engine coerces, so a function typed int happily…

Set for deduplication, and where it quietly fails

NoteFebruary 10, 20161 min read

[…new Set(values)] is the shortest deduplication in the language and it compares by identity, so it does nothing at all for a list of objects that happen to…

Upgrading a production application to PHP 7

Deep diveFebruary 2, 201614 min read

Twice the throughput and half the memory, for a migration that is mostly deletions — plus the four behaviour changes nobody puts in the upgrade notes.

Model events fire on the model, not on the query builder

NoteFebruary 2, 20161 min read

Eloquent fires saving, created, deleted and the rest when a model instance is saved. A mass update or delete goes straight to the query builder and fires nothing…

strict_types applies to the calls a file makes, not the calls it receives

NoteJanuary 19, 20161 min read

The rule reads backwards from how everyone assumes it works. declare(strict_types=1) governs the calls made from that file, not the calls made into the functions declared in it.…

list() is a language construct and never was a function

NoteJanuary 14, 20161 min read

list() looks like a function call and behaves like an assignment target, which is why it can appear on the left of = and why it cannot be…

Return types make a refactor fail at the boundary

NoteJanuary 12, 20161 min read

A docblock @return is a comment; the engine never reads it, so a method that starts returning null on a Tuesday fails somewhere else on a Thursday. A…

SplObjectStorage is the object set PHP does not advertise

NoteDecember 31, 20152 min read

Objects cannot be array keys, so checking whether an object is already in a collection usually turns into in_array($obj, $list, true) — a linear scan that gets slower…

Testing time-dependent code means injecting the clock

NoteDecember 25, 20152 min read

Code that calls time() or new DateTime() internally cannot be tested at a chosen moment. The usual workarounds are a sleep() in the test, which makes the suite…