php笔记(四)PHP类和对象之对象继承
建立一个Truck类,扩展Car类,并覆盖speedUp方法,使速度累加50
<?php class Car { public $speed = 0; //汽车的起始速度是0 public function speedUp() { $this->speed += 10; return $this->speed; } } //定义继承于Car的Truck类 class Truck extends Car{ public function speedUp(){ $this->speed=parent::speedUp()+50; } } $car = new Truck(); $car->speedUp(); echo $car->speed;
个人学习随笔,不一定原创,不定时更新
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[gitHub]: https://github.com/MicahZJ
[博客]: https://micahzj.github.io/MicahZJ.github.io/
[掘金]: https://juejin.im/user/5c1355ebe51d4521030cfe84/posts/
有关问题,或者想和本人讨论
欢迎通过本人QQ872219020联系
或者在github上提issues,虽然我不一定会去看o