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php-developer-list | 2001122

[PHP-DEV] Bug #14668: wrong bit arithmetics From: soletan <email protected>
Date: 12/23/01

From: soletan <email protected>
Operating system: SuSE Linux 7.1
PHP version: 4.1.0
PHP Bug Type: Scripting Engine problem
Bug description: wrong bit arithmetics

Hi,

using ip2long is strange enough itself (would you please
do some better description on what I get out after calling
this function or at least do some references to documents
(RFCs) describing that "IP address in full length
notation" format).

Anyhow: I'm coding the following

<?php
$a = base_convert( 0xFFFFFFFF ^ 1, 10 2 );
var_dump( $a );
?>

and get

string(2) "10"

(under 4.0.6 I got something different: 31 (!!!!) 1's in
string without that trailing 0)

what about all the other leading bits that should be 1?

And in relation with the ip2long-trouble I'm having:

<?php
$a = base_convert( ip2long( "255.255.0.255" ), 10, 2 );
$b = base_convert( ip2long( "255.255.0.255" ) ^
0xFFFFFFFF, 10, 2 );

var_dump( $a, $b );

?>

what gives me

string(16) "1111111100000001" string(16) "1111111100000000"

I beg to get some fast response! This behaviour of ip2long
and/or xor-operator is too strange to be easily understood
after reading that minimal function reference entry. But I
need it a lot for some work that needs to be done
urgently!!

Thank you very much!

Regards,
Thomas Urban 

-- 
Edit bug report at: http://bugs.php.net/?id=14668&edit=1

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