title: Yii2 send message (or notification) to admin after any user make create or update
body: <p>Three weeks ago I was trying to find a way to send message (or notification) to admin after any user make create or update, but ended up with nothing. I searched a lot and I did not find a clear solution, I am trying to understand Yii2 events, I found this link 
  <a href="http://www.yiiframework.com/wiki/329/real-time-display-of-server-push-data-using-server-sent-events-sse/" rel="nofollow noreferrer">http://www.yiiframework.com/wiki/329/real-time-display-of-server-push-data-using-server-sent-events-sse/</a></p>
  
  <p>I think it is the key to solve my problem, but I am really stuck I don't know what to do, hope anyone can help me.</p>
  
  <p>thanks </p>