PHP 观察者模式
Observed
->_observers =
attach(SplObserver ->_observers->attach(
detach(SplObserver ->_observers->detach(
(->_observers ->showMessage(
setName(->_name = ->
->
setAge(->age = (->_observers ->showAge(->_name,->
Observer
showMessage(SplSubject = ->(==='admin' '您好, ',,'欢迎您进入管理后台<br/>' "你好, '' 你已经被添加到了用户列表<br/>"
update(SplSubject
showAge(, "<script>alert(' 的年龄是: ')</script>" = Observed();
= Observer();
->attach();
->setName('张三');
->setName('admin'->setAge(24);
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