Posted by Pedro Graca on 01/19/06 01:17

DigDug wrote:
> I get two different results in doing a Xor on a large signed double
> between linux servers.

The ^ operator takes two integers, all bitwise operator do.

> working system is kernel 2.4 . bad results server is kernel 2.6.
>
> PHP version does not matter. I compile PHP from 4.2.2 to latest.
>
> test code:
> <?PHP echo -4738698913 ^ 43814; ?>

<?php if (PHP_VERSION>='4.4.0') echo PHP_INT_MAX; ?>

<?php echo var_dump(-4738698913); ?>

<?php echo -4738698913 | 0; ?>

<?php echo var_dump(-4738698913 | 0); ?>

> results:
>
> Good result from 2.4 kernel system is -443704711

64-bit machine?

> Bad result from 2.6 kernel systems(tried 5 different systems) is
> -2147439834

32-bit machine?

> BUG in PHP or kernel?

Neither, I think.

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