策略模式

// 策略模式
interface people
{
	function say();
	function paly();
}

class Children implements people
{
	function say()
	{
		echo "小孩子";
	}
	function paly()
	{
		echo "跑跑跳跳";
	}
}

class Man implements people
{
	function say()
	{
		echo '男人';
	}
	function paly()
	{
		echo '打游戏';
	}
}

class WoMan implements people
{
	function say()
	{
		echo '女人';
	}
	function paly()
	{
		echo '逛街';
	}
}

class Page
{
	function index()
	{
		$this->type->say();
		$this->type->paly();
	}

	function setType( $type )
	{
		$this->type = $type;
	}
}
$p = new Page();
$type = $_GET['type'];
switch ($type) {
	case 1:
		$peopleType = new Children();
		break;
	case 2:
		$peopleType = new Man();
		break;
	case 3:
		$peopleType = new WoMan();
		break;
}

$p->setType( $peopleType );
$p->index();