What are the permission modifiers in php

public Shared; the largest scope of permissions, everyone can access

protected Protected, inherited, second in permissions , only the class itself and its self-classes can access

private private, members defined as private are visible to all members within the class, without access restrictions. Access is not allowed outside the class.

Instructions: (Recommended learning: PHP programming from entry to proficiency)

权限修饰符
作用: 用来说明 属性/方法的权限特点
写在 属性/方法前面
private的属性/方法,只能在类定义的大括号内{},才能访问
public 的属性, 在任意位置都可以访问

***/

/****
代码部分
****/

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;; // happy;

// echo $lisi->money; // 调用位置在54行,在Human类的{}外面 ,因此,调用失败
// $lisi->money = 500;

echo $lisi->showMoney(),&#39;<br />&#39;;
/*
showMoney是公共的,在此行可以调用.
showMoney中的第48号,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(); // 不可以
$lisi->tellMe();    // 可以,因为是通过第56行,即,类内调用的.

/*
总结: private权限控制

只能在类的{} 内调用,
走出了{}, 谁也调不动.

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