Dynamically adding contents to a page as social networks do

Question

How can i dynamically add contents to a page?
I'm new to PHP and i guess PHP can't do this as it finishes its work after page load.
So what to do? heard about ajax and node.js.
Any code snippets will be helpful...

Answer 1

Great question. This might aide your efforts, and I hope it does. The simplest way of understanding "server-sent events":

https://www.w3schools.com/html/html5_serversentevents.asp