//设计模式
//单例模式：这个类只能实例化一个对象
/* class Ren
{
private static $dx;//用来存储生成的对象
public $name;
private function __construct()//私有的构造函数
{
}
//生成对象的方法
public function DuiXiang()
{
if (empty(self::$dx))
{
self::$dx = new Ren();
}
return self::$dx;
}
}
$a = Ren::DuiXiang();
$a->name = "老炮";
$ab = Ren::DuiXiang();
var_dump ($ab)*/
//工厂模式
//用来生产对象,扩展性非常强
class JiSuan
{
public $a;
public $b;
function Suan()
{
}
}
class Jian extends JiSuan
{
function Suan()
{
return $this->a-$this->b;
}
}
//工厂类
class GongChang
{
static function ShengChan($f)
{
switch($f)
{
case"+":
return new Jian();
break;
}
}
}
$r = GongChang::ShengChan("+");
$b = new Jian();
$b->a = 10;
$b->b = 5;
echo $b->Suan();