PHP privatea permission control

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//private permission control

// ===Code part 1===

class Human {
    public $mood = ''; // 心情，公有
    private $money = 1000; // 钱，私有

    public function showMoney() {
        return $this->money;
    }    private function secret() {
        echo '我小时候偷吃过一块肉';
    }    public function tellMe() {
        $this->secret();
    }
}
$lisi = new Human();
$lisi->mood = 'happy';
echo $lisi->mood,&#39;<br >&#39;;
//钱定义为私有属性，在类Human{}外面调用，调用失败
//echo $lisi->money;
//$lisi-money = 500;
echo $lisi->showMoney();
echo &#39;<br >&#39;;/*
showMoney是公共的，在此行可以调用.
showMoney中的 return $this->money;
这一句运行的环境是在 类{}的内部，因此有权限访问 money属性
*///$lisi->secret(); //报错$lisi->tellMe(); 
// 可以调用，因为在通过函数在类内调用的echo &#39;<hr >&#39;;

/*
Summary: private permission control

can only be called within class {}.
Walk out {}, it cannot be adjusted.
*/

//Permission control bug

// ===Code part 2===

class Human2 {
    private $money = 1000;    public function getMoney($people) {
        return $people->money;
    }    public function setMoney($people) {
        $people->money -= 500;
    }
}$zhangsan = new Human2();$lisi = new Human2();//echo $lisi->money; 
//报错// 让李四去打探张三的钱echo $lisi->getMoney($zhangsan),&#39;<br >&#39;;
 //1000// 让李四去改变张三的钱$lisi->setMoney($zhangsan); 
 //减500echo $lisi->getMoney($zhangsan),&#39;<br >&#39;; 
 //剩500print_r($zhangsan);

/*
The strange thing is that
zhangsan’s money should be affected by zhangsan calling getMoney and setMoney.

But the principle when talking about private permission control is Compliant:
That is:
The call of getMoney() public has the right
getMoney is in the class {} and has the right to read the private property money

The call of setMoney() public has The right
setMoney is in class {} and has the right to modify zhangsan’s private attribute money

*/

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