工厂模式

单元素模式

观察者模式

命令链模式

策略模式

复制代码 代码如下:

class people {

private $name = '';

private $user = null;

private function __constract($name){/*此处private定义辅助实现 单元素模式*/

$this->name = $name;

}

public static function instance($name){/*此方法实现 工厂模式*/

static $object = null;/*此变量实现 单元素模式*/

if (is_null($object))

$object = new people($name);

return $object;

}

public function work_in($who=null)

{

if (is_null($who)) echo 'error';

else {

$this->user[] = $who;/*此数组变量实现 观察者模式*/

echo $who->work();/*此方法调用实现 策略模式*/

}

}

public function on_action($which=''){

if (empty($which)) echo 'error';

else {

foreach ($this->user as $user)

$user->action($which);/*此方法调用实现 命令链模式*/

}

}

}

$people = people::instance('jack');

$people->work_in(new student);

$people->work_in(new teacher);

$people->on_action('eat');

class student {

function work(){

echo '<br/>我是学生，朝九晚五。';

}

function action($which){

if (method_exists($this, $which)) return $this->$which();

else echo 'you are wrong!';

}

function eat(){

echo '<br/>我是学生，只能吃套餐。';

}

}

class teacher {

function work(){

echo '<br/>我是老师，晚上备课最忙。';

}

function action($which){

if (method_exists($this, $which)) return $this->$which();

else echo 'i can not do it!';

}

function eat(){

echo '<br/>我是老师，可以每天吃大餐。';

}

}