March 2017
Intermediate to advanced
364 pages
9h 45m
Japanese
Content preview from 初めてのPHP
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34
2
章 テキストと数の操作
繰り返し」で説明します。しかし、例2-10 に示すように、数値を保持するすべての変数で使えます。
例
2-20
増分と減分
// $birthday
に
1
を加える
$birthday = $birthday + 1;
// $birthday
にさらに
1
を加える
++$birthday;
// $years_left
から
1
を引く
$years_left = $years_left - 1;
// $years_left
からさらに
1
を引く
--$years_left;
2.3.2
文字列内に変数を入れる
セルに計算値を入れた HTML テーブルや標準化された HTML テンプレートに特定のユーザの情
報を表示するユーザプロフィールページを表示するときなど、変数の値を他のテキストと一緒に出
力することが頻繁にあります。二重引用符で囲まれた文字列とヒアドキュメントではこれが簡単に
できます。変数を補間できるのです。すなわち、文字列に変数名
が含まれている場合、変数名はそ
の変数の値に置き換えられます。例2-21 では、
$email
の値が出力文字列の中に補間されます。
例
2-21
変数の補間
$email = 'jacob@example.com';
print "Send replies to: $email";
例2-21 の出力は次の通りです。
Send replies to: jacob@example.com
例2-22 に示すように、ヒアドキュメントは多くの変数を長い HTML のブロックの ...
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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.