<?php
/*
 * WEB开发笔记 www.chhua.com 每日练习之访问方法 public private protected的封装
 */
class Product {//基类
 private  $name;
 private $type;
 protected $jige;
 
 public function __construct($name,$type,$jage){
  $this->name=$name;
  $this->type=$type;
  $this->jige=$jage;
 }
 
 public function getName(){//访问方法
  return $this->name;
 }
 public function getType(){
  return $this->type;
 }
 public function getJiage(){
  return $this->jige;
 }
 
 public function get_zhaiyao(){
  $zhaiyao=$this->name.”({$this->type})<br>价格:{$this->jige}<br>”;
  return $zhaiyao;
 }
}

class BookProduct extends Product {//继承基类
 private $numpages;
 
    public function __construct($name,$type,$jige,$numpages=0){
  parent::__construct($name,$type,$jige);//访问父类的方法
  $this->numpages=$numpages;
 }
 public function getPages(){//独有方法
  return $this->numpages;
 }
 
 public function get_zhaiyao(){//重载方法
  $zhaiyao=parent::get_zhaiyao();//调用父类的方法
  $zhaiyao.=”Page Count-{$this->numpages}页”;
  return $zhaiyao;
 }
}

class CdProduct extends Product{//继承基类
 private $playlength;
 
public function __construct($name,$type,$jiage,$playlength=0){
  parent::__construct($name,$type,$jiage);
  $this->playlength=$playlength;
 }
 public function getTimes (){//独有方法
  return $this->playlength;
 }
 
 public function get_zhaiyao(){//重载方法
  $zhaiyao=parent::get_zhaiyao();//调用父类的方法
  $zhaiyao.=”Play Length-{$this->playlength}分”;
  return $zhaiyao;
 }
}

$cd=new CdProduct(“《经典教程》”,”CD”,58.8,120);

$book=new BookProduct(“《php教程》”,”BOOK”,98.8,456);

echo $cd->get_zhaiyao();
echo “<br>”;
echo $book->get_zhaiyao();
/*把类的属性进行封装,靠访问方法来实现属性的调用,提高类的安全性*/
?>

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