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

[Jim Lucas]

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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