RE: [Mod-pubsub-developer] PHP push

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Thanks Kragen! Sorry for the tardiness in responding, it's gotten kinda
busy round here. I forwarded your comments on server-push v. client-pull
to the back-end architecting (gahh, when did 'architect' become a verb?)
folks at Ludicorp (vide., <http://gameneverending.com/>), it was exactly
the sort of information people will most need to know when deciding what
technology to base their massively multiplayer online game (for example)
on. And so why aren't such figures published front-and-center on the KNN
site?? (Not-so-subtle nudge-nudge for KnowNow employees on the list.)

Okay, I dug up the PHP bits, it's so simple it hurts -- just gotta watch
out not to rely on ob_implicit_flush(), apparently it's still unstable so
use an explicit flush() instead. Some sample code (wch. might not survive
Yahoo-mail, they're getting testy abt. inline script stuff), e.g.:

<?php

function msleep($msec){
  $start = gettimeofday(); $usec = $msec*1000; 
  do { $stop = gettimeofday();
       $timePassed = 1000000 * ($stop['sec'] - $start['sec'])+
$stop['usec'] - $start['usec'];
  } while ($timePassed < $usec);
}

function send($msg) {
  $pre = "<script>parent.msg('";  // start JS call to parent
  $post = "')</script> ";             // wrap-up the JS call
  echo str_repeat(" ", 300) . "\n";      // MSIE caching fix
  echo "$pre $msg $post" ;             // buffer the message
  flush();                                // send the packet
}

// set_time_limit(5) ;   // optional 5 sec. timeout (default = 30 secs)

$z = 10;
while ($z>0) { 
  msleep(1000);				// Sleep 1 sec.
  send("<h1>".$z--." ... </h1>");
}      
msleep(1200);  
send("<h1>... shooka-pata-tata, hey!</h1>") ; 

?>

While the client page'd look something like -- 

<head>
<script> 
  function msg(content) {
    status = " ";        // suppress URL display in status bar
    document.getElementById('display').innerHTML = content ;
  }
</script>
</head>
<body>
<div id="display"></div>
<iframe style='display:none' src="pusher.php" name="pushlet">
</body>

So I guess you'd just round-robin through the currently connected client
IP addresses any time there's something to send 'em, and like that ...

D.

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