php.net |  support |  documentation |  report a bug |  advanced search |  search howto |  statistics |  random bug |  login

go to bug id or search bugs for

Bug #20542 0+0=4G on aix4.3 (64bits)
Submitted: 2002-11-21 05:45 UTC Modified: 2002-12-13 02:25 UTC
Votes:1
Avg. Score:5.0 ± 0.0
Reproduced:1 of 1 (100.0%)
Same Version:0 (0.0%)
Same OS:0 (0.0%)
From: rvl at interchain dot nl Assigned:
Status: Closed Package: Math related
PHP Version: 4.2.3 OS: aix 4.3.3.0
Private report: No CVE-ID: None
View Developer Edit
Welcome back! If you're the original bug submitter, here's where you can edit the bug or add additional notes.
If you forgot your password, you can retrieve your password here.
Password:
Status:
Package:
Bug Type:
Summary:
From: rvl at interchain dot nl
New email:
PHP Version: OS:

 

 [2002-11-21 05:45 UTC] rvl at interchain dot nl 
Script:
	<?
	echo '0+0=', 0+0, "\n";
	?>

Output of script on php 4.2.3:

	0+0=4294967294

which is equal to 2^32-2

(Output of script on php 4.1.2 and 4.0.6:
	0+0=4294967296
which is equal to 2^32).

In general, all simple additions and multiplications produce huge numbers:

	0+0=4294967294
	0+1=4294967295
	1+0=4294967295
	1+1=4294967296
	0-0=0
	0-1=-1
	1-0=1
	1-1=0
	0*0=3.5178585246345E+18
	0*1=3.5178585265101E+18
	1*0=3.5178585265101E+18
	1*1=3.5178585283857E+18
	0/1=0
	1/1=1
	2/1=2
	2/2=1

Installation issues
# gcc -v
Reading specs from /usr/local/lib/gcc-lib/rs6000-ibm-aix4.3.3.0/2.95.3/specs
gcc version 2.95.3 20010315 (release)
# make -v
GNU Make version 3.79.1, by Richard Stallman and Roland McGrath.
Built for rs6000-ibm-aix4.3.3.0
# tar -xf apache_1.3.20.tar
# cd apache_1.3.20
# ./configure --enable-module=most
# cd ..
# tar -xf php-4.2.3.tar
# cd php-4.2.3
# ./configure --without-mysql --with-apache=../apache_1.3.20 --enable-static --with-iodbc=/usr/local --enable-track-vars
# make
# make install
# cd ..
# cd apache_1.3.20
# configure --enable-module=most --activate-module=src/modules/php4/libphp4.a
# make
# make install

I don't know if it is very relevant but the rs6000 on which aix4.3 is running
is a 64bits machine. The c program
	int main()
	{
		printf("long=%dbits\n",8*sizeof(long));
		return 0;
	}
outputs 'long=64bits' when compiled with 'cc -q64', while when compiled
with 'gcc' it outputs 'long=32bits'.

Thanks very much in advance,
Rein van Vliet

Patches

Pull Requests

History

AllCommentsChangesGit/SVN commitsRelated reports
 [2002-11-21 17:25 UTC] iliaa@php.net 
Sorry, but your problem does not imply a bug in PHP itself.  For a
list of more appropriate places to ask for help using PHP, please
visit http://www.php.net/support.php as this bug system is not the
appropriate forum for asking support questions. 

Thank you for your interest in PHP.

string cancatination is done using . not , in PHP.
<?php
echo '0+0=' .  (0+0) .  "\n";
?>
Results in 0 on any platform.
 [2002-11-22 02:47 UTC] rvl at interchain dot nl 
I am sorry but on this specific platform
<?php echo (0+0); ?> does result in 4294967294, really!
And <?php $x = 0; $x = $x + 0; echo $x; ?> as well.
 [2002-11-27 18:54 UTC] iliaa@php.net 
Could this be an issue with the C library used on AIX? On a 64 bit platform (64sparc) I cannot replicate the problem using PHP 4.2.3.
 [2002-12-13 01:00 UTC] php-bugs at lists dot php dot net 
No feedback was provided for this bug for over 2 weeks, so it is
being suspended automatically. If you are able to provide the
information that was originally requested, please do so and change
the status of the bug back to "Open".
 [2002-12-13 02:25 UTC] rvl at interchain dot nl 
Seems a gcc bug.
Now PHP compiled with the native AIX C compiler
(and apache still compiled with gcc)
and it works.
 
PHP Copyright © 2001-2025 The PHP Group
All rights reserved. 		Last updated: Fri Oct 24 07:00:01 2025 UTC