March 2017
Intermediate to advanced
364 pages
9h 45m
Japanese
Content preview from 初めてのPHP
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6.5
プロパティとメソッドのアクセス権
107
6.5
プロパティとメソッドのアクセス権
例6-12 の
ComboMeal
コンストラクタは、
ComboMeal
の材料として
Entree
のインスタンスだけが渡
されるようにします。しかし、その後はどうでしょうか。それ以降のコードで
$ingredients
プロ
パティの値を任意に（
Entree
以外の配列、数値、さらには
false
にも）変更できます。
この問題は、プロパティのアクセス権（visibility）を変更して防ぎます。
public
の代わりに、
private
あるいは
protected
と指定できます。このような他の設定をしても、クラス内のコードが
実行できることは変わりません。常に独自のプロパティを読み書きできます。
private
は、そのク
ラス外のコードがプロパティにアクセスできないようにします。
protected
は、そのクラス外でプ
ロパティにアクセスできるコードはサブクラスのコードだけであることを
意味します。
例6-13 は
Entree
クラスを修正したものです。
$name
プロパティが
private
、
$ingredients
プロパ
ティが
protected
になっています。
例
6-13
プロパティのアクセス権の変更
class Entree {
private $name;
protected $ingredients = array();
/* $name
は
private
なので、これは
$name
を読み取る手段を提供する
*/
public function ...
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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.