March 2017
Intermediate to advanced
364 pages
9h 45m
Japanese
Content preview from 初めてのPHP
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12.4
未捕捉例外の処理
251
>00007: $total_price = $price * $tax_rate;
00008: }
00009:
今回は
13.5
に増えています。最後の
continue
でプログラムを完了させます。
prompt>
continue
phpdbg はプログラムの実行を続け、プログラムの実際の出力が得られます。
Total price (with tax): $13.50
[$total_price was removed, removing watchpoint]
[Script ended normally]
phpdbg がウォッチポイントで 2 回目に一時停止したときに、
$total_price
の値の計算方法に問
題があることは明らかです。これは、前節で導入したデバッグ出力と同じ結論です。
入力する具体的な構文（または GUI をクリックする場所）はデバッガやIDE によって変わるかも
しれま
せんが、基本的な考え方は同じです。デバッガは、特別な監視をしながらプログラムを実行
します。選択した箇所でプログラムの実行を一時停止し、停止中にプログラムの内部を調べること
ができます。
12.4
未捕捉例外の処理
「6.3 例外を使った問題の通知」ではPHP での例外の使い方の基本を説明し、例 6-8 では例外が
発行されたのに捕捉しないとどうなるかを示しました。PHP プログラムは実行を停止し、PHP エ
ンジンはエラー情報とスタックトレース（プログラムが停止した時点で互いに
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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.