单元素模式
观察者模式
命令链模式
策略模式 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 '
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 '
我是学生，只能吃套餐。'; }}class teacher { function work(){ echo '
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 '
我是老师，可以每天吃大餐。'; }}
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