{  A.AMethod( B b ) {    b.BMethod();    /*….*/  }}

{  A.AMethod( I i ) {    i.Method();  }}

<?phpinterface Calculation {  function compute($a, $b);}class Addition implements Calculation {  function compute($a, $b)  {    return "加法運(yùn)算結(jié)果為:".($a+$b);  }}class Subtraction implements Calculation {  function compute($a, $b)  {    return "減法運(yùn)算結(jié)果為:".($a-$b);  }}class Multiplication implements Calculation {  function compute($a, $b)  {    return "乘法運(yùn)算結(jié)果為:".($a*$b);  }}class Division implements Calculation{  function compute($a, $b)  {    return "除法運(yùn)算結(jié)果為:".($a/$b);  }}class Modf implements Calculation {  function compute($a, $b)  {    return "取模運(yùn)算結(jié)果為:".($a % $b);  }}class Coupling implements Calculation {  //這里直接：public $varl = new LazyDog(); 會(huì)出錯(cuò)。  public $varl = null;  function __construct()  {    $this->varl = new LazyDog();  }  function compute($a, $b)  {    return $this->varl->say();  }}/*也可以用繼承的方式實(shí)現(xiàn)喲:class Coupling extends LazyDog implements Calculation {  function compute($a, $b)  {    return parent::say();  }}*/class LazyDog {  function say()  {    return "我什么運(yùn)算都不做...只是為了實(shí)現(xiàn)'耦合設(shè)計(jì)模式'...我是出來打醬油的......";  }}class Test {  private $one;  private $two;  public function __construct($x,$y)  {    $this->one=$x;    $this->two=$y;    echo "Class Test 初始化：屬性/$one=".$this->one."，屬性/$two=".$this->two."<hr />";  }  function display(Calculation $a){    return "用PHP接口技術(shù)實(shí)現(xiàn)的運(yùn)算：".$a->compute($this->one,$this->two)."<hr />";  }}$t = new Test(96,12);$t1 = new Addition();$t2 = new Subtraction();$t3 = new Multiplication();$t4 = new Division();$t5 = new Modf();$dog = new Coupling();echo $t->display($t1);echo $t->display($t2);echo $t->display($t3);echo $t->display($t4);echo $t->display($t5);echo $t->display($dog);?>