[snip]
Is there a way for the server to notify the client about an event,
provided
the client was online in the past X minutes?

To elaborate:

A client comes online. A script PHP executes (serves the client), and
terminates. Now if a new event occurs, how can the server notify the
client
about that event?
[/snip]

You would need a connection with state to do that, web server
connections are stateless. The client would have to have a 'listener'
waiting for some event to be pushed to them and then the listener would
take an action.

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