March 2024
Intermediate to advanced
408 pages
5h 16m
Japanese
Content preview from PHPクックブック ―モダンPHPによるWebアプリケーション実用レシピ集
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13章デバッグとテスト
開発者の最善の努力にもかかわらず、コードが完璧であることはありません。アプリケーションの運用環境における動作に影響を与えたり、何かが期待通りに動作しないときにエンドユーザを苦しめたりするようなバグが入り込んでしまうことは避けられません。
アプリケーションでエラーを適切に処理することはとても重要です†1。しかしながら、アプリケーションがスローするすべてのエラーが予期していたもの、あるいは捕捉可能なものであるとは限りません。このような状況では、アプリケーションを適切に「デバッグする」方法を理解しなければなりません。
[†1] エラー処理の詳細については、「12章 エラー処理」を参照してください。
PHPエンジニアがコードをデバッグするために最初に使うステップの1つがecho命令です。本格的なデバッガを利用できない場合、開発チームがエラーの発生場所を特定するために挿入したecho "Here!";命令が開発コードに散乱しているのをよく見かけます。
Laravelフレームワークは、dd()（https://oreil.ly/N-bOz、「dump and die」の略）と呼ばれる関数を公開することで、新しいプロジェクトに取り組んでいる間、同様の機能を普及させ、簡単にアクセスできるようにしました。この関数は実際にはSymfonyのvar-dumper（https://oreil.ly/8pXGo）モジュールにより提供され、PHPのネイティブコマンドラインインターフェイスと対話的デバッガを活用する場合の両方で効果的に動作します。関数自体は次のように定義されます。
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.