From: andy at haveland dot com
Operating system: Linux 2.6.25.11-97.fc9.x86_64
PHP version: 5.2.6
PHP Bug Type: Feature/Change Request
Bug description: 64bit unsigned integers, or provide a workaround.
Description:
------------
I've had a look at some bogus bug reports on unsigned integers and
rounding precision, and understand the issues and reasons but want to add
my voice to request better integer support. bcmaths is overkill for simple
bit operations.
I'm trying to use php to process thousands of random 64-bit ids supplied
in decimal and half have the high bit set.
As they are keys in a database mapped to hierarchical directories,
accuracy, speed and repeatability is a big issue. Renaming to 63 bit ids is
not an option!
You may consider this as a bogus request, but I think lack of unsigned
support is a serious issue.
Any bit operations that touch the high bit turn to mush if set, and limits
php to 31 or 63 bit program!
If perl can deal correctly with this, then shouldn't php be able to as
well?
Andy.
Reproduce code:
---------------
$id = 11791849344837931437;
print "\$id = $id\n";
printf("\$id = 0x%x (%20u)\n", $id, $id);
f($id);
f(($id & 0xf000000000000000) >> 60);
$idhi= $id >> 32;
$idlo= $id & 0xffffffff;
f2($idhi, $idlo);
function f($id) {
printf ("f(\$id) = 0x%x (%20u)\n", $id, $id);
}
function f2($idhi, $idlo) {
printf ("\$idhi = 0x%x (%20u)\n", $idhi, $idhi);
printf ("\$idlo = 0x%x (%20u)\n", $idlo, $idlo);
}
(Perl code is practically identical, apart from s/function/sub/ and param
passing)
Expected result:
----------------
# perl showbug.pl
$id = 11791849344837931437
$id = 0xa3a51080d3fcd1ad (11791849344837931437)
f($id) = 0xa3a51080d3fcd1ad (11791849344837931437)
f($id) = 0xa ( 10)
$idhi = 0xa3a51080 ( 2745503872)
$idlo = 0xd3fcd1ad ( 3556561325)
Actual result:
--------------
# php showbug.php
$id = 1.1791849344838E+19
$id = 0xa3a51080d3fcd000 (11791849344837931008)
f($id) = 0xa3a51080d3fcd000 (11791849344837931008)
f($id) = 0xfffffffffffffffa (18446744073709551610)
$idhi = 0xffffffffa3a51080 (18446744072160088192)
$idlo = 0xd3fcd000 ( 3556560896)
--
Edit bug report at http://bugs.php.net/?id=45688&edit=1
--
Try a CVS snapshot (PHP 5.2):
http://bugs.php.net/fix.php?id=45688&r=trysnapshot52
Try a CVS snapshot (PHP 5.3):
http://bugs.php.net/fix.php?id=45688&r=trysnapshot53
Try a CVS snapshot (PHP 6.0):
http://bugs.php.net/fix.php?id=45688&r=trysnapshot60
Fixed in CVS: http://bugs.php.net/fix.php?id=45688&r=fixedcvs
Fixed in release:
http://bugs.php.net/fix.php?id=45688&r=alreadyfixed
Need backtrace: http://bugs.php.net/fix.php?id=45688&r=needtrace
Need Reproduce Script: http://bugs.php.net/fix.php?id=45688&r=needscript
Try newer version: http://bugs.php.net/fix.php?id=45688&r=oldversion
Not developer issue: http://bugs.php.net/fix.php?id=45688&r=support
Expected behavior: http://bugs.php.net/fix.php?id=45688&r=notwrong
Not enough info:
http://bugs.php.net/fix.php?id=45688&r=notenoughinfo
Submitted twice:
http://bugs.php.net/fix.php?id=45688&r=submittedtwice
register_globals: http://bugs.php.net/fix.php?id=45688&r=globals
PHP 4 support discontinued: http://bugs.php.net/fix.php?id=45688&r=php4
Daylight Savings: http://bugs.php.net/fix.php?id=45688&r=dst
IIS Stability: http://bugs.php.net/fix.php?id=45688&r=isapi
Install GNU Sed: http://bugs.php.net/fix.php?id=45688&r=gnused
Floating point limitations: http://bugs.php.net/fix.php?id=45688&r=float
No Zend Extensions: http://bugs.php.net/fix.php?id=45688&r=nozend
MySQL Configuration Error: http://bugs.php.net/fix.php?id=45688&r=mysqlcfg
