Re: bit wise math? Is there a function to easily return the bits?

[Jim Lucas <lists@xxxxxxxxx>]

Jon Anderson wrote:
> function bits($num) {
>        $bit_array = str_split(strrev(decbin(intval($num))));
>        $val_array = array();
>        foreach ($bit_array as $pow => $bit) {
>                if ($val = $bit * pow(2,$pow))
>                        $val_array[] = $val;
>        }
>        return($val_array);
> }
>
> (I wanted to see if I could write it in few LOC.) I wonder if there's a 
> faster way...
>
> jon
>
> blackwater dev wrote:
> > Is there a php function I can call to pass in a number and get the values
> > returned?
> >
> > For example, pass in 7 and get 1,2,4 ?
> >
> > Thanks!
and for those of us running PHP<5.x here is a working example

function bits($num) {
	$bit_array = split('.',strrev(decbin(intval($num))));
	$val_array = array();
	foreach ($bit_array as $pow => $bit) {
		if ($val = $bit * pow(2,$pow))
			$val_array[] = $val;
	}
	return $val_array;
}


--
Enjoy,

Jim Lucas

Different eyes see different things. Different hearts beat on different 
strings. But there are times for you and me when all such things agree.

- Rush

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