What are the permission modifiers in php-PHP Problem-php.cn

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,'
'; // 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(),'
'; /* 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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