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Posted by Rory Browne on 06/18/20 11:17
On 5/31/05, Richard Lynch <ceo@l-i-e.com> wrote:
> 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?
Because you can :)
>
> > ?>
> >
> > 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/)
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> >
> >
>
>
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