1.创建父类电脑类：Computer
<?php
/**
* 创建父类电脑类：Computer
*/
class Computer
{
protected $brand;
protected $price;
//构造方法
public function __construct($brand,$price)
{
$this->brand = $brand;
$this->price = $price;
}
public function internet()
{
return '能上网';
}
}2.创建子类笔记本电脑类：Notebook
<?php
/**
* 创建子类笔记本电脑类：Notebook
* 类Notebook继承自Computer类
*/
class Notebook extends Computer
{
//创建查询器
public function __get($name)
{
return $this->$name;
}
private $portable = false;//是否便于携带
public function __construct($brand, $price,$portable)
{
parent::__construct($brand, $price);
$this->portable = $portable;
}
//对父类方法进行重写
public function internet()
{
return parent::internet().',而且体积小便于携带';
}
}3.创建一个测试的php脚本
<?php
//自动加载类
spl_autoload_register(function($className){
require 'class/'.$className.'.php';
});
$notebook = new Notebook('联想','5888','true');
echo '品牌:'.$notebook->brand.'<br>';
echo '价格:'.$notebook->price.'<br>';
echo '是否可携带:'.($notebook->portable?'是':'否').'<br>';
echo $notebook->internet().'<br>';运行结果：
