PHP单例模式的实现(职责模式)

name = $n;
    }
    public function getTag(){
        return $this->name;
    }
}
//创建实例
$a = Single::getInstance();
$b = Single::getInstance();
$a->setname('hello');
$b->setname('go-die');
echo $a;//go-die
echo $b;//go-die