动态地将私有属性添加到对象

问题描述

我有一堂课

class Foo {
    // Accept an assoc array and appends its indexes to the object as property
    public function extend($values){
        foreach($values as $var=>$value){
            if(!isset($this->$var))
                $this->$var = $value;
        }
    }
}

$Foo = new Foo;
$Foo->extend(array('name' => 'Bee'));

现在$Foo对象具有值为Bee的公共name属性.

Now the $Foo object has a public name property with value Bee.

如何更改extend函数以使变量私有?

How to change extend function to make variables private ?

修改使用私有数组是另一种方法，绝对不是我的答案.

EditUsing a private array is another way and definitely not my answer.

推荐答案

简单，糟糕的设计.

在运行时添加私有[！]字段的目的是什么?现有的方法不能依赖于这样添加的字段，并且您会弄乱对象的功能.

What's the purpose of adding a private [!] field at runtime? Existent methods can't rely on such added fields, and you'd be messing with the object functionality.

如果您希望对象的行为类似于哈希图[即您可以只调用$obj -> newField = $newValue]，考虑使用魔术__get和__set方法.

If you want your object to behave like an hashmap [i.e. you can just call $obj -> newField = $newValue], consider using magic __get and __set methods.

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