php - Ajax based chat - infinite server side loop -

I have a chat on my page. I send an AJAX post every 5 seconds to answer.

Something like an infinite loop on the server.

PHP server side:

  $ i = 0 while (! $ Answers = checkNearex () and amp; $ i ++ <1000) {sleep (1); } Echo json_encode ($ replies); Go out;   
 Wrong view?   
 
 
 I think that possibly there are numbers of solutions. You can see the polls for a long time (what you basically are doing).  
 Another option is to use something like XMPP in which some JavaScript clients are