Idea how to implement server-push content without php looping

Question

I was implementing the server-push content using comet to the client browser. There should be updates when mysql got insert then something will happen to client, so I'm currently doing by PHP like this:

PHP
  while (check database if update is there)
  {
    usleep(10000); 
   // do write json
  }

It actually working, but what happening to me is my hosting(shared) run out of resource even when I just test with 5 simultaneous clients. CPU is 40% loading at this moment and cause account disable.

So please someone advise any idea how to trigger php to send out the new update only without looping check.

Yoshi · Accepted Answer · 2012-09-04 14:38:03Z

2

I think your problem is that you have a slight error regarding usleep. The parameter should be:

micro seconds
Halt time in micro seconds. A micro second is one millionth of a second.

Your script currently halts for 0.01 seconds instead of 10 seconds, which, I assume, is not what you wanted.

use:

usleep(10 * 1000000);

or:

sleep(10);

answered Sep 4, 2012 at 14:38

Yoshi

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Community · Accepted Answer · 2017-05-23 12:04:47Z

2

I don't know how your Javascript looks like, but I think you're approaching it incorrect. What you really wanna do is probably to send requests from the browser with 10 secs intervals. See this example.

edited May 23, 2017 at 12:04

CommunityBot

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answered Sep 4, 2012 at 14:13

Andreas Bergström

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Matt S · Accepted Answer · 2012-09-04 14:14:26Z

1

This method will not use any CPU during the sleep time:

set_time_limit(0);
while (check database if update is there) {
   sleep(10); 
   // do write json
}

answered Sep 4, 2012 at 14:14

Matt S

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