converting some doubles to strings yields trailing colon

[Brett Kiefer]

Binary package hint: php5

1) Description: Ubuntu hardy (development branch), Release: 8.04

2) module php5, Version: 5.2.4-2ubuntu5

3) I expect any number, divided by 10 times itself, then converted to a string, to yield "0.1"

4) In this release, sometimes I get "0.0:" (yes, that's 0.0 with a trailing colon character)

Detailed repro steps:

I can reproduce this bug on 32-bit Hardy Heron's default PHP, running on VMWare, and have seen it on another user's non-VM setup.

Repro instructions:

$ php -v
PHP 5.2.4-2ubuntu5 with Suhosin-Patch 0.9.6.2 (cli) (built: Feb 27 2008 20:43:54)
Copyright (c) 1997-2007 The PHP Group
Zend Engine v2.2.0, Copyright (c) 1998-2007 Zend Technologies

$ cat test.php
<?php
        for ($d = 0.10; $d < 1; $d = $d + 0.1) print $d * 10 . " " . ($d / ($d * 10)) . "\n";
?>
1) Description: Ubuntu hardy (development branch), Release: 8.04

2) module php5, Version: 5.2.4-2ubuntu5

$ php test.php
1 0.1
2 0.1
3 0.1
4 0.1
5 0.1
6 0.0:
7 0.0:
8 0.1
9 0.0:
10 0.1

Observed: Iterations 6, 7, and 9 have the output "0.0:"
Expected: All of these should have the output "0.1"

[Russell Smith (mr-russ)]

This bug does not present itself on my amd64 installation, but it is present on my i386 installation.

[Russell Smith (mr-russ)]

I have tested this bug against PHP's snapshot php5.2-200805020830. I can reproduce it on i386 using the version listed in this comment. I have logged a bug with PHP.

http://bugs.php.net/bug.php?id=44890

I have not attached the bug URL to the upstream bug as I do now know how to do it for php bugs.

I'll continue to follow this up with PHP developers we can get a resolution upstream. After that we can get the patch merged into Ubuntu.

Thanks again for you bug report.

[Russell Smith (mr-russ)]

The bug doesn't actually apply to PHP the package, it only appears to apply as when you compile the php source on Ubuntu the problem appears. Compiling on a different system, in my case CentOS 5.1 i686, give the correct output and the bug is not reproducible.

[Chuck Short (zulcss)]

This should be fixed in lucid now as well.

Regards
chuck