用观察者模式切换页面风格
男式风格女士风格观察学习区不观察学习区
我是内容
我是广告
学习

lognum = rand(1,10); $this->hobby = $hobby; $this->observers = new SplObjectStorage(); } public function login() { //操作session等 $this->notify(); } public function attach(SPLObserver $observer) { $this->observers->attach($observer); } public function detach(SPLObserver $observer) { $this->observers->detach($observer); } public function notify() { $this->observers->rewind(); while ($this->observers->valid()) { $observer = $this->observers->current(); $observer->update($this); $this->observers->next(); } } } //用户安全登录模块 class Safe implements SPLObserver { public function update(SplSubject $subject) { if ($subject->lognum < 3) { echo '这是第' . $subject->lognum . '次安全登录
'; }else{ echo '这是第' . $subject->lognum . '次登录，异常
'; } } } //广告模块 class Ad implements SPLObserver { public function update(SplSubject $subject) { if ($subject->hobby == 'sports') { echo '英超开始啦
'; }else{ echo '好好学习
'; } } } //实施观察 // $user = new User('sports'); $user = new User('study'); $user->attach(new Safe()); $user->attach(new Ad()); $user->login();//登录