享元模式

当显示机枪兵状态时，绘制工厂会判断机枪兵实例是否已经存在了
如果存在了就直接返回

//如果把
static private $flyweights;
//改为
private $flyweights;
//对应的self::改成$this为什么不行呢？？？

<?php

//机枪兵享元
class MarineFlyweight
{
public function __construct()
{
//第一次实例化时输出，来对比下，第二次使用时，还会不会再实例化一个
echo "实例化了一次！";
}
//绘制机枪兵的图像动画，参数为状态，比如属于哪一个玩家
public function drawMarine($state)
{
//绘制机枪兵
echo "机枪兵享元!".$state;
}

}

//享元工厂
class FlyweightFactory
{
//享元数组，用于存放多个享元
static private $flyweights;
//获取享元的方法
public function getFlyweight($name)
{
if (!isset(self::$flyweights[$name]))
{
$obj = $name."Flyweight";
self::$flyweights[$name] = new $obj();
}
return self::$flyweights[$name];
}
}

$flyweightFactory = new FlyweightFactory();//初始化享元工厂
$marine = $flyweightFactory->getFlyweight("Marine");//绘制一个机枪兵
$status = "我还有3滴血！";
$marine->drawMarine($status);//机枪兵某一个状态显示

$marine = $flyweightFactory->getFlyweight("Marine");//绘制一个机枪兵
$status = "我还有2滴血！";
$marine->drawMarine($status);//机枪兵某一个状态显示

?>