Re: Different binary results with different PHP versions

Skeleton wrote:
So what should I do at this point? I need to make XOR operations with
such big(small) numbers.
Chung Leong wrote:
Skeleton wrote:
My PHP 5.1.2 is on Windows. So the problem is about the Operating
Systems.

David Haynes wrote:
Be careful of your base assumptions. php 5.1.2 on Linux produces
-2147483647 as well.

-david-

No, it's difference is in the compiler. The operation you describe
causes a double-to-long-integer conversion overflow. Gcc probably
throws in a check which sets the value to the integer boundary whereas
MS Visual C just lets it wrap around.

What exactly are you trying to do? One possible solution is to perform
the operation on strings instead:

<?

$a = "\x01\x02\x03";
$b = "\xFF\x02\x03";

$c = $a ^ $b;

for($i = 0; $i < strlen($c); $i++) {
printf("%x, ", ord($c[$i]));
}

?>

.

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