On Monday 27 December 2004 12:40, Richard Lynch wrote:
> If you want to mimic the behaviour of abs (allowing for positive numbers)
> and performance was an issue, that:
> $x = ($x < 0) ? - $x : $x;
>
> is most likely faster than abs()
Having nothing better to do I decided to benchmark this:
ternary:
$doo = -20;
for ($i = 1; $i < 10000000; $i++) {
$dah = ($doo < 0) ? - $doo : $doo;
}
abs():
$doo = -20;
for ($i = 1; $i < 10000000; $i++) {
$dah = abs($doo);
}
It turns out that abs() is slightly faster - as you might have guessed,
otherwise I wouldn't be posting this ;-)
ternary = 14.67 secs
abs() = 14.10 secs
The moral of the story is: if speed is important to you always do your *own*
benchmarking.
--
Jason Wong -> Gremlins Associates -> www.gremlins.biz
Open Source Software Systems Integrators
* Web Design & Hosting * Internet & Intranet Applications Development *
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