PHP 简单工厂模式（静态工厂模式）

1. 简单工厂模式（静态工厂模式）

   <?php
   /**
    *  简单工厂模式（静态工厂模式）
    */
   
   /**
    * Interface DemandIO
    * 定义接口
    */
   interface DemandIO {
       public function Price ();
   }
   
   class GoodsMacBook implements DemandIO{
       public function Price () {
           echo 'price=8888rmb'.PHP_EOL;
       }
   }
   
   class GoodsXps implements DemandIO {
       public function Price () {
           echo 'price=6999rmb'.PHP_EOL;
       }
   }
   
   class Service {
       public static function GetGoods($name='') {
           if ($name === 'xps') {return new GoodsXps();}
           if ($name === 'macbook') {return new GoodsMacBook();}
           throw new Exception("not object ".PHP_EOL);
       }
   }
   try{
       $obj =  Service::GetGoods();
   } catch  (Exception $e){
       echo $e->getMessage(); // not object
   }
   
   try{
       $obj =  Service::GetGoods('xps');
       $obj->Price(); // price=6999rmb
   } catch  (Exception $e){
       echo $e->getMessage();
   }
   
   try{
       $obj =  Service::GetGoods('macbook');
       $obj->Price(); // price=8888rmb
   } catch  (Exception $e){
       echo $e->getMessage();
   }