title: Opening a connection to a webserver (controller) and keeping it alive
body: <p>is it possible to open a connection to a "server" in php and let that server send commands later to that page without the need of the user to reload it?</p>
  
  <p><strong>Better Explanation</strong>: When a user joins our index.php, a connection will be open to a "server" on the same domain, that server will later send some data to all "users" connected to it, and the php would parse it and display the data.</p>
  
  <p>Is it possible? If yes, what should I look for?</p>