1、yii2系统登录

const EVENT_BEFORE_LOGIN = ‘beforeLogin‘;      //登录前　
const EVENT_AFTER_LOGIN = ‘afterLogin‘;       //登录后
const EVENT_BEFORE_LOGOUT = ‘beforeLogout‘;   //退出前
const EVENT_AFTER_LOGOUT = ‘afterLogout‘;     //退出后

yii2 内置事件