At 1/25/2007 11:16 AM, 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 ?
Here's a slightly more off-the-wall contribution:
====================================
function bin2array($iDecimal)
{
$aResult = array_reverse(explode("\r\n", chunk_split
(decbin($iDecimal), 1)));
array_walk($aResult, 'doPower');
return $aResult;
}
function doPower(&$iValue, $iIndex)
{
$iValue = $iValue * pow(2, $iIndex);
}
====================================
Here's the break-down of that eye-crossing first statement:
array_reverse(explode("\r\n", trim(chunk_split (decbin($iDecimal), 1))));
using $iDecimal = 6:
$a = decbin($iDecimal) --> '110'
$b = chunk_split($a, 1) --> '1\r\n1\r\n0'
$c = explode("\r\n", $b); // array(1,1,0)
$d = array_reverse($c); // array(0,1,1)
(If you're using PHP5 you can use split() instead of chunk_split()
and explode().)
The doPower function performs this transform on each member of the array:
$iValue = $iValue * pow(2, $iIndex);
Ix Val Math
0 0 0 * 2^0 = 0
1 1 1 * 2^1 = 2
2 1 1 * 2^2 = 4
Regards,
Paul
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http://juniperwebcraft.com
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