php原型模式的实现方法及介绍（附代码）

<?php

//海洋
class Sea{
	//可导航性
	private $navigability=0;
	function __construct($navigability){
		$this->navigability=$navigability;
	}
}
//地球海洋
class EarthSea extends Sea{}

//火星海洋
class MarsSea extends Sea{}
//平原
class Plains{}
//地球平原
class EarthPlains extends Plains{}

//火星平原
class MarsPlains extends Plains{}

//森岭
class Forest{}
//地球森林
class EarthForest extends Forest{}

//火星森林
class MarsForest extends Forest{}

//地形工厂
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;
	}
}

class Contained{}
class Container{
	public $contained;
	
	function __construct(){
		$this->contained=new Contained();
	}
	function __clone(){
		//确保被克隆的对象持有的是self::$contained的克隆而不是引用
		$this->contained=clone $this->contained;
	}
}
$factory=new TerrainFactory(new EarthSea(-1), new EarthPlains(), new EarthForest());

print_r($factory->getSea());

print "<hr>";

print_r($factory->getPlains());

print "<hr>";

print_r($factory->getForest());