Posted by David Haynes on 05/21/06 15:00

Toby Inkster wrote:
> bellefy@gmail.com wrote:
>
>> $r = ($v && ($v) == 0 ? true : false);
>
> Better:
>
> $r = (($v & ($v-1)) == 0);
>
> NEVER code '?true:false' (or the opposite).
>
This makes 0 a power of two...

Try:
$r = !($v & ($v-1)) && $v;

-david-

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