PHP - 在课堂上关闭，获得私有财产

Question

我正在尝试使用闭包从另一个类获取私有属性，如下所述：

http://ocramius.github.io/blog/accessing-private-php-class-members-without-reflection/

所以，我正在尝试获取$ wheelCount属性。

但我一直在

Fatal error: Cannot access private property Car::$wheelCount

所以我的车类是：

class Car
{
    private $wheelCount = 4;    

    public function __construct($wheely)
    {

             echo $wheely->getWheels($this);

    }
}

然后

   class getThoseWheels
    {

        public function getWheels($that)
        {

            $wheels = Closure::bind($this->getPrivate($that), null, $that);

            var_dump($wheels);


        }

        public function getPrivate($that)
        {
             return $that->wheelCount;
        }
    }

运行：

$wheely = new getThoseWheels();

new Car($wheely);

Answer 1

$wheels = Closure::bind($this->getPrivate($that), null, $that);

问题是您正在执行 $this->getPrivate()，并且此方法正在尝试访问private属性。所有这一切都发生在Closure::bind之前。你应该像这样使用它：

$wheels = Closure::bind(function () { return $this->wheels; }, $that, $that);

或者可能：

$wheels = Closure::bind([$this, 'getPrivate'], null, $that);

我没有对此进行测试，但至少这比你的代码有更好的成功机会。