$p = 'ABCD';
$n = unpack('N', $p);
print("$n\n");          # 1094861636
$n *= 1/3;
print("$n\n");          # 364953878.666667
$p = pack('N', $n);
$n = unpack('N', $p);
print("$n\n");          # 364953878