<?php 
interface js{ 
function ys($a,$b); 
} 
class Af implements js{ 
function ys($a,$b){ 
return "加法運(yùn)算......結(jié)果為:".($a+$b); 
} 
} 
class Jf implements js{ 
function ys($a,$b){ 
return "減法運(yùn)算......結(jié)果為:".($a-$b); 
} 
} 
class AAf implements js{ 
function ys($a,$b){ 
return "乘法運(yùn)算......結(jié)果為:".($a*$b); 
} 
} 
class JJf implements js{ 
function ys($a,$b){ 
return "除法運(yùn)算......結(jié)果為:".($a/$b); 
} 
} 
class Modf implements js{ 
function ys($a,$b){ 
return "取模運(yùn)算......結(jié)果為:".($a % $b); 
} 
} 
class China implements js{ 
public $varl=null;//這里直接：public $varl = new nothingx(); 會(huì)出錯(cuò)。 
function __construct(){ 
$this->varl = new nothingx(); 
} 
function ys($a,$b){ 
return $this->varl->say(); 
} 
} 
/*也可以用繼承的方式實(shí)現(xiàn)喲: 
class China extends nothingx implements js{ 
function ys($a,$b){ 
return parent::say(); 
} 
} 
*/ 
class nothingx{ 
function say(){ 
return "我什么運(yùn)算都不做...只是為了實(shí)現(xiàn)<font color=#990000><b>‘耦合設(shè)計(jì)模式'</b></font>...我是出來(lái)打醬油的......"; 
} 
} 
class test{ 
private $one; 
private $two; 
public function __construct($x,$y){ 
$this->one=$x; 
$this->two=$y; 
echo "<font size=20px><strong>面向?qū)ο蟪绦蛟O(shè)計(jì)——接口</font></strong><hr>Class test初始化：<br>屬性\$one=".$this->one."　　屬性\$two=".$this->two."<hr>"; 
} 
function display(js $a){ 
return "<font color=#990000><b>用PHP接口技術(shù)實(shí)現(xiàn)的運(yùn)算——開(kāi)始運(yùn)算啦:</b></font><hr>".$a->ys($this->one,$this->two)."<hr>"; 
} 
} 
$t=new test(103,2); 
$t1=new jf; 
$t2=new China; 
echo $t->display($t1); 
echo $t->display($t2); 
?>