title: Real time updates on web using PHP?
body: <p>I'm looking to implement a real-time collaboration on a document on the web.  Is there some sort of library that enables it in PHP? Something <a href="http://www.hanselman.com/blog/AsynchronousScalableWebApplicationsWithRealtimePersistentLongrunningConnectionsWithSignalR.aspx" rel="nofollow noreferrer">similar to SignalR</a> which creates 'persistent connection' by using long-polling.</p>
  
  <p><strong>update</strong> found this library for <a href="http://code.google.com/p/pubsubhubbub/" rel="nofollow noreferrer">pubsubhubbub</a> <a href="http://code.google.com/p/pubsubhubbub/source/browse/trunk/publisher_clients/php/" rel="nofollow noreferrer">http://code.google.com/p/pubsubhubbub/source/browse/trunk/publisher_clients/php/</a></p>
  
  <p>Searching on the library name led me to <a href="https://stackoverflow.com/q/3847043/37759">How to implement PubSubHubbub?</a></p>