(bogus means "Not a bug" here)

This is the internal representation of signed integer using unsigned integer. 32bits use one bit for the sign, that explains the negative _displayed_ values, but the internal values are the same.

Big numbers should be processed using bcmath or pecl/big_int

Thanks, for your answer, I try to understand... but I use an internal function of php that returns differents values depends of my processor architecture ? It's correct ? Not should be the same and Php be in charge of this and return alway the same value independently of the 32b or 64b processor ?

Thanks, Bernardo.

"but I use an internal function of php that returns differents values depends of my processor architecture ? It's correct ? "

No, it is not correct.

It is the _same_ value. But PHP has only signed integer. A signed integer can be used to store an unsigned integer. But when you display it, it thinks that is a negative number.

Try:
echo dechex(ip2long("255.255.255.128"));'

Thanks, I understand.

Searching I found this solution, and now I have the same value in both systems:

$x = ip2long('255.255.255.248');
if ($x < 0) { $x+=pow(2,32); }

It's correct ? Can I expect that work in the future no matter the value that I pass?

P.S.: maybe you can put and aclaration in ip2long function about this, I found many questions for the same problem when searching "signed" and "unsigned" in php bugs.

Thanks for your help, Bernardo.