March 2017
Intermediate to advanced
364 pages
9h 45m
Japanese
Content preview from 初めてのPHP
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7.4
データの検証
123
必須項目の確認には、
if()
文で値自体を検査する代わりに
strlen()
を使います。
if (! $_
POST['quantity'])
のようなテストは、
false
と評価される値をエラーとして扱います。
strlen()
を使うと、ユーザは
0
のような値を必須項目に入力できます。
7.4.2
数値要素や文字列要素
サブミットされた値が整数か浮動小数点数であることを確認するには、適切なフィルタで
filter_input()
関数を使います。
filter_input
では、操作する入力の種類、入力でサブミットされ
た値の名前、値に適用したい規則を PHP に通知します。
FILTER_VALIDATE_INT
と
FILTER_VALIDATE_
FLOAT
フィルタは、それぞれ整数と浮動小数点数であるかを調べます。
例7-10 に、整数フィルタの使い方を示します。
例
7-10
整数入力のフィルタリング
$ok = filter_input(INPUT_POST, 'age', FILTER_VALIDATE_INT);
if (is_null($ok) || ($ok === false)) {
$errors[] = 'Please enter a valid age.';
}
例7-10 で は、
filter_input(INPUT_POST, 'age', FILTER_VALIDATE_INT)
は サ ブ ミ ッ ト さ れ た
データフォーム（
INPUT_POST
）、厳密には ...
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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.
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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.