CompareUnsigned32bitInt

// Compares unsigned 32-bit integer
function CompareUnsigned32bitInt($a, $b)
{
    if($a == $b)
        return 0;
    elseif(($a < 0 and $b < 0) or ($a > -1 and $b > 0))
        return $a > $b ? 1 : -1;
    elseif($a < 0 and $b >= 0)
        return 1;
    else    // $a > 0 and $b <= 0
        return 1;
}