<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Document</title> </head> <body> <?php class Person { function __construct($name, $sex) { $this->name = $name; $this->sex = $sex; } function showName() { echo $this->name; } function showSex() { echo $this->sex; } } /** * 子类 */ class Teacher extends Person { function __construct($name, $sex, $job) { parent::__construct($name, $sex); $this->job = $job; } function showJob() { echo $this->job; } } //$p1 = new Person('刘一', '男'); $laowang = new Teacher('老王', '男', '老师'); // $p1->showSex(); // $laowang->showJob(); $laowang->showSex(); $laowang->showName(); ?> </body> </html>