問題描述

我在班級之外有一個全局變量 = $MyNumber;

I have a global variable outside my class = $MyNumber;

我如何將其聲明為 myClass 中的屬性?
對于我班上的每個方法，我都是這樣做的:

How do I declare this as a property in myClass?
For every method in my class, this is what I do:

class myClass() {

    private function foo() {
         $privateNumber = $GLOBALS['MyNumber'];
    }

}

我想要這個

I want this

class myClass() {

    //What goes here?
    var $classNumber = ???//the global $MyNumber;

    private function foo() {
         $privateNumber = $this->classNumber;
    }

}

我想基于全局 $MyNumber 創建一個變量，但是
在方法中使用之前修改

I want to create a variable based on the global $MyNumber but
modified before using it in the methods

類似: var $classNumber = global $MyNumber + 100;

something like: var $classNumber = global $MyNumber + 100;

推薦答案

您可能不真的想這樣做，因為調試將是一場噩夢，但它似乎成為可能.關鍵是您在構造函數中通過 reference 分配的部分.

You probably don't really want to be doing this, as it's going to be a nightmare to debug, but it seems to be possible. The key is the part where you assign by reference in the constructor.

$GLOBALS = array(
    'MyNumber' => 1
);

class Foo {
    protected $glob;

    public function __construct() {
        global $GLOBALS;
        $this->glob =& $GLOBALS;
    }

    public function getGlob() {
        return $this->glob['MyNumber'];
    }
}

$f = new Foo;

echo $f->getGlob() . "
";
$GLOBALS['MyNumber'] = 2;
echo $f->getGlob() . "
";

輸出將是

1
2

這表明它是通過引用而不是值來分配的.

which indicates that it's being assigned by reference, not value.

正如我所說，調試將是一場噩夢，所以你真的不應該這樣做.通讀維基百科關于封裝的文章；基本上，理想情況下，您的對象應該管理自己的數據以及修改該數據的方法；恕我直言，即使是公共財產也是個壞主意.

As I said, it will be a nightmare to debug, so you really shouldn't do this. Have a read through the wikipedia article on encapsulation; basically, your object should ideally manage its own data and the methods in which that data is modified; even public properties are generally, IMHO, a bad idea.

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