March 2017
Intermediate to advanced
364 pages
9h 45m
Japanese
Content preview from 初めてのPHP
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305
20
章
国際化とローカライゼーション
＊1
「2.1 テキスト」で述べたように、PHP での文字列はバイトの連続です。1 バイトは最大256 個
の値を取ることができます。そのため、英語の文字（US-ASCII 文字セット）だけを使うテキスト
を PHP で表すのは簡単ですが、日本語を含む他の種類の文字を含むテキストを適切に処理するに
は一工夫が必要です。
Unicode 標準は、使用できる無数の文字をエンコードする方法を定めています。Unicode標準
には、ä、ñ、ž、
λ
、
、 、ドなどの文字に加え、さまざまな記号やアイコンも含まれています。
UTF-8 エンコーディングはどのバイトがどの文字を表すかを定めています。簡単な英語の文字は
1 バイトだけで表されます。しかし、他の文字には 2、3 あるいは 4 バイト必要なものもあります。
PHP は、標準で UTF-8 エンコーディングによるテキスト処理をサポートしています。
default_
charset
構成変数は使用するエンコーディングを制御し、そのデフォルト値は
UTF-8
です。問題が
あったら、
default_charset
が
UTF-8
に設定されていることを確認してください。
歴史的な理由により、日本語では複数のエンコーディングが使用されています。Unicode の普及
により、Web アプリケーションにおける主流は UTF-8 となっていますが、Windows および Mac-
OS 環境では Shift_JIS、メールでは ISO-2022-JP ...
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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.