Bug #48187 [Com]: DateTime::diff() corrupting microtime() result
Edit report at http://bugs.php.net/bug.php?id=48187&edit=1
ID: 48187
Comment by: jasonjoo dot god at gmail dot com
Reported by: wavetrex at gmail dot com
Summary: DateTime::diff() corrupting microtime() result
Status: Open
Type: Bug
Package: Date/time related
Operating System: Windows 2003 Server
PHP Version: 5.3.0RC2
Block user comment: N
New Comment:
my test script below:
<?php
date_default_timezone_set("Asia/Chongqing");
echo microtime(true);
echo "\n";
$now=new DateTime();
$now->diff(new DateTime());
echo microtime(true);
?>
and my os is win32/xp
I found this isue can be reproduced under apache in handler mode, but it
is no isue in command line mode(eg. php test.php).
for example, I got its output like this:
1281415176.9756
1281402595.446
and the wrong one only change the part following dot
my php version is 5.3.3
Previous Comments:
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[2010-07-18 00:47:15] k.schroeder@php.net
Automatic comment from SVN on behalf of k.schroeder
Revision: http://svn.php.net/viewvc/?view=revision&revision=301359
Log: Test for #48187
------------------------------------------------------------------------
[2009-05-10 01:41:59] wavetrex at gmail dot com
float(1241919300.3593)
float(1241709350.3736)
int(1241919300)
int(1241919300)
string(25) "2009-05-10T04:35:00+03:00"
string(25) "2009-05-10T04:35:00+03:00"
( http://wt.ath.cx/jani.php )
Note: 1241709350 -> this value seems to stay almost unchanged over time
(look at my first submission: string(21) "0.25882200 1241709345" )
When I reported the difference was ~50000 seconds, now it's over 200.000
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[2009-05-09 20:59:00] jani@php.net
What is the output of the script I provided?
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[2009-05-09 06:58:21] wavetrex at gmail dot com
@jani:
I'm using microtime() multiple times to determine how long some
complex parts of the script take to execute, when I noticed weird
differences.
Also, while the second microtime() call after diff() is wrong, the
third seems to be ok, just like calling the function resets some
internal variable that was broken during execution of diff()
I prepared a script on my server:
http://wt.ath.cx/diff.php
The code for this script is here:
http://wt.ath.cx/diff.txt
Server configuration:
http://wt.ath.cx/phpinfo.php
Time difference between the two calls:
Expected result:
3.814697265625E-5 (a few microseconds)
Actual result:
-142455.45035195 (??)
Your script:
http://wt.ath.cx/jani.php
... also has the error.
If this probably occurs on my server, I'm thinking... it might be
timezone related ? I'm sure yours and mine are different. (check my
phpinfo.php to see date/time settings)
P.S.
While investigating, I noticed that in some rare cases it doesn't
happen, and after Ctrl-R it gives the erroned value again. Try
reloading the page a few times in case 1st time it shows the correct
values.
I'll keep experimenting with the new 5.3.0 time functions and see if
some other errors appear.
------------------------------------------------------------------------
[2009-05-09 04:15:40] jani@php.net
Try this script instead: (I can't reproduce this..)
<?php
// two arbitrary dates
$date1=new DateTime("2005-07-23");
$date2=new DateTime("2006-02-14");
$begin_u = microtime(true);
$begin_t = time();
$begin_a = date(DATE_ATOM);
var_dump($date1->diff($date2));
var_dump($begin_u, microtime(true));
var_dump($begin_t, time());
var_dump($begin_a, date(DATE_ATOM));
?>
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