Re: Does this indicate a bug in PHP?

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Message-ID	<1968307.IDv9frP7EL@PointedEars.de> (permalink)
From	Thomas 'PointedEars' Lahn <PointedEars@web.de>
Reply-To	Thomas 'PointedEars' Lahn <php@PointedEars.de>
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Subject	Re: Does this indicate a bug in PHP?
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Vlatko Šurlan wrote:

> Pay attention to the different mtimes reported.
> 
> vlatko@david:/tmp/mtimeTests$ php5 -v
> PHP 5.3.3-7+squeeze14 with Suhosin-Patch (cli) (built: Aug  6 2012
> 20:08:59) Copyright (c) 1997-2009 The PHP Group
> Zend Engine v2.3.0, Copyright (c) 1998-2010 Zend Technologies
>     with Xdebug v2.2.1, Copyright (c) 2002-2012, by Derick Rethans
>     with Suhosin v0.9.32.1, Copyright (c) 2007-2010, by SektionEins GmbH
> 
> vlatko@david:/tmp/mtimeTests$ ll
> total 56
> -rw-r----- 1 vlatko vlatko 51946 Kol 23 19:01 img.jpg

`stat img.jpg', which shows the milliseconds, would have been more helpful 
for diagnostics.

> vlatko@david:/tmp/mtimeTests$ php5 -r 'echo filemtime("img.jpg") . "\n";'
> ****1345741275****
> 
> vlatko@david:/tmp/mtimeTests$ php5 -r '$zip = new ZipArchive();
> $zip->open("test.zip", ZIPARCHIVE::CREATE); $zip->addFile("img.jpg");
> $zip->close();'
> 
> vlatko@david:/tmp/mtimeTests$ php5 -r '$zip = new ZipArchive();
> $zip->open("test.zip"); print_r($zip->statIndex(0));'
> [snip]
>     [mtime] => ****1345741274****
> [snip]
> 
> vlatko@david:/tmp/mtimeTests$ zip update test.zip
>   adding: test.zip (stored 0%)

This adds test.zip to the ZIP archive `update.zip'.  It has nothing to do 
with the *mtime* of test.zip or the files in test.zip.

> vlatko@david:/tmp/mtimeTests$ php5 -r '$zip = new ZipArchive();
> $zip->open("test.zip"); print_r($zip->statIndex(0));'
> [snip]
>     [mtime] => ****1345741274****
> [snip]
>  
> I detected this while trying to update a ZIP archive using PHP. Obviously
> I tried to compare filemtime for each file with what ZipArchive reported
> and realized that they are never the same. What is going on here?

$ stat -c %Y test.txt
1270260799

$ php5 -r 'echo filemtime("test.txt") . "\n";'
1270260799

$ php5 -r '$zip = new ZipArchive(); $zip->open("test.zip", 
ZIPARCHIVE::CREATE); $zip->addFile("test.txt"); $zip->close();'

$ php5 -r '$zip = new ZipArchive(); $zip->open("test.zip"); print_r($zip-
>statIndex(0));' | grep mtime
    [mtime] => 1270260798

$ php5 --version
PHP 5.3.10-1 (cli) (built: Feb  3 2012 10:03:01) 
Copyright (c) 1997-2012 The PHP Group
Zend Engine v2.3.0, Copyright (c) 1998-2012 Zend Technologies
    with XCache v1.3.2, Copyright (c) 2005-2011, by mOo
    with Xdebug v2.1.0, Copyright (c) 2002-2010, by Derick Rethans
    with Suhosin v0.9.32.1, Copyright (c) 2007-2010, by SektionEins GmbH

The mtime with ZipArchive is behind by only one second after epoch.  This 
might be caused by that mtime not taking into account UTC's leap seconds.
 

PointedEars
-- 
When all you know is jQuery, every problem looks $(olvable).

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Does this indicate a bug in PHP? Vlatko Šurlan <vlatko.surlan@evorion.hr> - 2012-08-24 01:36 +0200
  Re: Does this indicate a bug in PHP? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2012-08-25 00:47 +0200

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