<?php

 # 简单工厂

 abstract class mycoach

 {

     public function __construct(){}

 }

 class cultivatecpc extends mycoach{

     public function __construct(){

         echo "把陈培昌培养为搏击教练"."\n";

     }

 }

 class cultivatecj extends mycoach{

     public function __construct(){

         echo "把程劲培养为搏击教练"."\n";

     }

 }

 class martialclub

 {

     public function cultivate($name)

     {

         switch($name){

             case 'cj':

                 return new cultivatecj();

             case 'cpc':

                 return new cultivatecpc();

             default:

                 echo '培养一个小教练'."\n";

                 break;

         }

         return null;

     }

 }

 class clubmaster{

     public function cultivate()

     {

         $myclub = new martialclub();

         $myclub->cultivate('cj');

         $myclub = new martialclub();

         $myclub->cultivate('cpc');

     }

 }

 $mymaster = new clubmaster();

 $mymaster->cultivate();

把程劲培养为搏击教练

把陈培昌培养为搏击教练

<?php

abstract class mycoach

{

    public function __construct()

    {}

}

class cpc extends mycoach

{

    public function __construct()

    {

        echo "培养出了搏击教练昌仔"."\n";

    }

}

class cj extends mycoach

{

    public function __construct()

    {

        echo "培养出了搏击教练劲儿弟弟"."\n";

    }

}

interface cultivate{

    function cultivate();

}

class cultivatecpc implements cultivate

{

    public function cultivate()

    {

        return new cpc();

    }

}

class cultivatecj implements cultivate

{

    public function cultivate()

    {

        return new cj();

    }

}

class coach{

    public function __construct()

    {

        $coach = new cultivatecpc();

        $coach->cultivate();

        $coach = new cultivatecj();

        $coach->cultivate();

    }

}

$littlecoach = new coach();

培养出了搏击教练昌仔

培养出了搏击教练劲儿弟弟

<?php

 class watcher

 {

     private $name;

     public function __construct($myname){

         $this->name=$myname;

     }

     public function update($food)

     {

         switch($food)

         {

             case '奶油蛋糕':

                 echo $food."上桌了，".$this->name.'取出了一份纸盘子和塑料叉子,切了一块'."\n";

                 break;

             case '烤鸭':

                 echo $food."上桌了，".$this->name.'取了张薄饼，夹了些许葱丝，刷了些甜面酱'."\n";

                 break;

             default:

                 echo $food."上桌了，".$this->name."赶紧加了两筷子"."\n";

                 break;

         }

         return null;

     }

 }

 class watchee

 {

     private $watchlist = [];

     public function addwatcher($watcher)

     {

         $this->watchlist[]=$watcher;

     }

     public function removewatcher($watcher)

     {

         $target = array_search($watcher,$this->watchlist);

         $target = (int)$target;

         unset($this->watchlist[$target]);

         //echo $target."\n";

     }

     public function loaddish($dishname)

     {

         $this->notify($dishname);

     }

     public  function  notify($dishname)

     {

　　　　　　#这里推荐用foreach循环，for循环带来的陷阱是，如果以数字为索引，执行removewatcher方法后，有些索引就没了，访问不到就会报错

　　　　foreach($this->watchlist as $k=>$v)

       {

             $this->watchlist[$k]->update($dishname);

       }

     }

 }

 $cpc = new watcher('陈培昌');

 $cj = new watcher('程劲');

 $observee = new watchee();

 $observee->addwatcher($cpc);

 $observee->addwatcher($cj);

 $observee->loaddish('葱香四川凉面');

 $observee->removewatcher($cj);

 $observee->loaddish('奶油蛋糕');

 $xxd = new watcher('徐晓冬');

 $observee->addwatcher($xxd);

 $observee->loaddish('避风塘茄子');

葱香四川凉面上桌了，陈培昌赶紧加了两筷子

葱香四川凉面上桌了，程劲赶紧加了两筷子

奶油蛋糕上桌了，陈培昌取出了一份纸盘子和塑料叉子,切了一块

避风塘茄子上桌了，陈培昌赶紧加了两筷子

避风塘茄子上桌了，徐晓冬赶紧加了两筷子