Re: Re: How to make a script sleep for 5 seconds?

On Mon, May 30, 2005 7:17 pm, Peter Brodersen said: > On Mon, 30 May 2005 21:08:29 -0400, in php.general > robert@interjinn.com (Robert Cummings) wrote: > >>Sorry to hijack this thread but I was wondering how to make a script >>sleep for 5 seconds? sleep(5); > Easy: > <?php > for($i=0;$i<5;$i++) sleep(1); > ?> > > Or better: > <?php > $endtime = time()+5; > while (time() != $endtime); > ?> This runs the risk of somebody adding some code in there that takes longer than a second to run, and then suddenly it's in an infinite loop because the $endtime is never EQUAL to time() Safe to say while (time() <= $endtime) > Or even better: > <?php > $endtime = time()+5; > while (date +%s != $endtime); Gak! Why would you shell out to do this? > ?> > > We have busy wait, we have risk of indefinite loops. The next step > should be (more) imprecision. Maybe read /proc/cpuinfo and perform n > steps of simple loop where n is calculated from the cpu type, mhz and > current load. Maybe a PEAR project? > > -- > - Peter Brodersen > > -- > PHP General Mailing List (http://www.php.net/) > To unsubscribe, visit: http://www.php.net/unsub.php > > -- Like Music? http://l-i-e.com/artists.htm