PHP如何优雅地实现hook？
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PHP如何优雅地实现hook？
一般都是基于观察者模式 学习下原理基本就明白了
注册："hook函数名"('事件名', 'callback', /* 其他的可优化的功能 优先级等*/)
触发: "hook函数名"('事件名')
用类也是一样的 无非是各种名字 注册有on、listen神马的 触发可以是fire trigger之类的
明白原理 这些东西就只是形式
可以参考wordpress的do_action()和apply_filters()函数
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