php原型模式的研究

 <?php

 class Sea{}
 class EarthSea extends Sea{}
 class MarsSea extends Sea{}

 class Plains{}
 class EarthPlains{}
 class MarsPlains{}

 class Forest{}
 class EarthForest{}
 class MarsForest{}

 class TerrainFactory{
     private $sea;
     private $forest;
     private $plains;

     function __construct(Sea $sea,Plains $plains,Forest $forest){
         $this->sea = $sea;
         $this->plains = $plains;
         $this->forest = $forest;
     }

     function getSea(){
         return clone $this->sea;
     }
     function getPlains(){
         return clone $this->plains;
     }
     function getForest(){
         return clone $this->forest;
     }
 }

 $factory = new TerrainFactory(new EarthSea,new EarthPlains, new EarthForest);
 print_r($factory->getSea());
 print_r($factory->getPlains());
 print_r($factory->getForest());

 $mars_factory = new TerrainFactory(new MarsSea,new MarsPlains, new MarsForest);
 print_r($mars_factory->getSea());
 print_r($mars_factory->getPlains());
 print_r($mars_factory->getForest());