PHP 属性作为对象 [英] PHP property as object

问题描述

是否可以将类的属性设置为对象?

Is it possible to set a property of a class as a object?

喜欢:

class User {

    public $x = "";
    public $y = new ErrorVO();
    public $w = new array();

}

推荐答案

在构造函数中，是的.

class User
{
    public $x = "";
    public $y = null;
    public $w = array();

    public function __construct()
    {
        $this->y = new ErrorVO();
    }
}

编辑

KingCrunch 提出了一个很好的观点:你不应该对你的依赖项进行硬编码.您应该将它们注入您的对象(控制反转 (IoC)).

KingCrunch made a good point: You should not hard-code your dependencies. You should inject them to your objects (Inversion of Control (IoC)).

class User
{
    public $x = "";
    public $y = null;
    public $w = array();

    public function __construct(ErrorVO $y)
    {
        $this->y = $y;
    }
}

new User(new ErrorVD());

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