复制代码代码如下:php
【提示】本例通过测试无误【情景设计】模拟计算机主板IDE接口，比如：主板可以存取的储存器常常有光驱、硬盘、闪存等等，为了方便，有必要对这些不同的储存器设定同一的接口。
本例还假设一种前所未有的、存取方式与众不同的外星储存器也要加到主板上进行存取，于是需要采用耦合的设计模式。
【本例主要讲述】1、通过接口、抽象类、一般类继承三种方式达到所谓的“接口”模式，以此说明：A、子类对象可以当父类对象用，因为子类是特殊的父类！
B、请注意这三种实现方式中接口、抽象类和一般类继承的基类写法！
2、接口模式真的是一纸契约！
3、程序设计之"耦合设计模式"！
*///----------------------------------------------------------------------/*【方式一】接口实现方式:*/ interface readandwrite{function read();function write();}class motherboard{private $storage;function __construct(readandwrite $obj){$this->storage=$obj;}function read(){$this->storage->read();}function write(){$this->storage->write();}}class flash implements readandwrite{function __construct(){echo "我是闪存：";}function read(){echo "开始读取数据......
";}function write(){echo "开始储存数据......
";}}class yingpan implements readandwrite{function __construct(){echo "我是硬盘：";}function read(){echo "开始读取数据......
";}function write(){echo "开始储存数据......
";}}class disco implements readandwrite{function __construct(){echo "我是光盘：";}function read(){echo "开始读取数据......
";}function write(){echo "开始储存数据......
";}}//----------------------------------------------------------------------/*【方式二】抽象类实现方式:abstract class readandwrite{abstract function read();abstract function write();}class motherboard{private $storage;function __construct(readandwrite $obj){$this->storage=$obj;}function read(){$this->storage->read();}function write(){$this->storage->write();}}class flash extends readandwrite{function __construct(){echo "我是闪存：";}function read(){echo "开始读取数据......
";}function write(){echo "开始储存数据......
";}}class yingpan extends readandwrite{function __construct(){echo "我是硬盘：";}function read(){echo "开始读取数据......
";}function write(){echo "开始储存数据......
";}}class disco extends readandwrite{function __construct(){echo "我是光盘：";}function read(){echo "开始读取数据......
";}function write(){echo "开始储存数据......
";}}*///----------------------------------------------------------------------//【方式三】一般类继承实现方式：/*class readandwrite{function read(){echo "reading..............";}function write(){echo "writing..............";}}class motherboard{private $storage;function __construct(readandwrite $obj){$this->storage=$obj;}function read(){$this->storage->read();}function write(){$this->storage->write();}}class flash extends readandwrite{function __construct(){echo "我是闪存：";}function read(){echo "开始读取数据......
";}function write(){echo "开始储存数据......
";}}class yingpan extends readandwrite{function __construct(){echo "我是硬盘：";}function read(){echo "开始读取数据......
";}function write(){echo "开始储存数据......
";}}class disco extends readandwrite{function __construct(){echo "我是光盘：";}function read(){echo "开始读取数据......
";}function write(){echo "开始储存数据......
";}}*///----------------------------------------------------------------------/*【耦合模式】耦合模式就是将不同标准的两个类（本例的接口、抽象类、普通基类与外星储存器有不同的存取方法），通过中间转换器，达到同一标准的目的，就像转接线一样——本例就是将unknow类的Rdata、Wdata方法转换成read、write方法，达到和本例的接口、抽象类、普通基类相同的存取方法， 本例的中间转换器是Apdater类。
由于php中只能继承一个类但可以继承多个接口，所以产生了三种耦合方法：方法一：中间转换器Apdater类继承抽象类或普通基类，但由于php中只能继承一个类，所以在Apdater类中定义一个外星存储器类unknow的对象，并用重载继承的抽象类或普通基类的存取方法的方式来转换存取方法，达到同一存取方法的目的。
方法二：中间转换器Apdater类继承外星存储器类unknow、接口，此时可以直接用Apdater类的存取方法(parent::Rdata()与parent::Wdata()——php中子类调用父类方法的方式)，和实现接口规定方法，来转换存取方法，达到同一存取方法的目的。
方法三：与方法一雷同，只是改为继承（实现）接口；
*///----------------------------------------------------------------------/*【方法一】*//*class unknow{function __construct(){echo "我是地球人未知的外星储存器，我有不同于地球储存器的存取方式：";}function Rdata(){echo "I'm reading now......
";}function Wdata(){echo "I'm writing now......
";}}class Adpater extends readandwrite{private $obj;function __construct(unknow $x){$this->obj=$x;}function read(){$this->obj->Rdata();}function write(){$this->obj->Wdata();}}*///----------------------------------------------------------------------/*【方法二】class unknow{function __construct(){echo "我是地球人未知的外星储存器，我有不同于地球储存器的存取方式：";}function Rdata(){echo "I'm reading now......
";}function Wdata(){echo "I'm writing now......
";}}class Adpater extends unknow implements readandwrite{function read(){parent::Rdata();}function write(){parent::Wdata();}}*///------------------------------------------------------------------------/*【方法三】*/ class unknow{function __construct(){echo "我是地球人未知的外星储存器，我有不同于地球储存器的存取方式：";}function Rdata(){echo "I'm reading now......
";}function Wdata(){echo "I'm writing now......
";}}class Adpater implements readandwrite{private $obj;function __construct(unknow $x){$this->obj=$x;}function read(){$this->obj->Rdata();}function write(){$this->obj->Wdata();}}//【程序主体调用】echo "面向对象程序设计——接口";$storage1=new flash();$computer=new motherboard($storage1);$computer->read();$computer->write();$storage2=new yingpan();$computer=new motherboard($storage2);$computer->read();$computer->write();$storage3=new disco();$computer=new motherboard($storage3);$computer->read();$computer->write();$un_storage=new unknow();$apdaterx=new Adpater($un_storage);$computer=new motherboard($apdaterx);$computer->read();$computer->write();?>