Resolve the power of two terms of a given sum using the binary system

pot.php

<?php

// resolve the power of two terms of a given sum
// using the binary system
function resolvePowerOfTwo($sum)
{
    $result = array();

    // binary representation
    $bin = decbin($sum);

    // length
    $len = strlen($bin);
    // skip the zero in the array
    $len--;

    // counter
    $j = 0;
    for($i = $len; $i >= 0; $i--)
    {
        // current digit
        $digit = substr($bin, $j, 1);

        $j++;
        if($digit == '1')
        {
            // save the digit binary representation
            $result[] = pow(2, $i);
        }
    }

    return $result;
}

?>