Edit report at https://bugs.php.net/bug.php?id=54050&edit=1
ID: 54050
User updated by: nospam at unclassified dot de
Reported by: nospam at unclassified dot de
Summary: microtime() returns random values
Status: Duplicate
Type: Bug
Package: *General Issues
Operating System: Windows XP
PHP Version: Irrelevant
Block user comment: N
Private report: N
New Comment:
Wow, that was fast. Why was the other bug picked up to quickly? Where this
thing is around for years and doing unimaginable damage...
Could somebody with sufficient access please tell the other bug that this is
NOT limited to PHP 5.5 (as he emphasised many times) but also happened much
earlier?
Previous Comments:
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[2013-03-11 20:56:37] s...@php.net
Duplicate of bug #64370
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[2011-06-09 13:51:32] ynn at free dot fr
There is a simpler test case :
for ($i=0 ; $i<=100000 ; $i++)
{
$mt = microtime(true);
if(isset($last) && $mt<$last)
echo 'Last:'.$last.' - Current:'.$mt."\n";
$last = $mt;
}
On Windows XP, PHP 5.3.5, I get outputs that looks like :
Last:1307620010.9549 - Current:1307620010.0533
Last:1307620010.9742 - Current:1307620010.0689
Last:1307620010.9742 - Current:1307620010.0689
Last:1307620010.983 - Current:1307620010.0845
Last:1307620010.9909 - Current:1307620010.0845
Last:1307620011.0142 - Current:1307620010.1158
Last:1307620011.0612 - Current:1307620010.147
Last:1307620011.0679 - Current:1307620010.1626
Last:1307620011.0865 - Current:1307620010.1783
Last:1307620011.115 - Current:1307620010.2095
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[2011-02-18 23:31:48] nospam at unclassified dot de
The seconds part of the return value seems to be my system boot time. I have
now restarted the computer and the value points to that time. The fractional
part is kind of oscillating around similar values. It's going up and down a bit
every time but it has the tendency to decrease slowly. I have discovered a few
other places in my application where it happens. But it's always the same
database function. The same code.
$start0 = microtime(true);
$start = microtime(true);
if (abs($start - $start0) > 1)
{
var_dump($start0);
var_dump($start);
}
This should never print something but it does. Here are a few examples:
float(1298065510.0493) float(1298068208.1106)
float(1298065510.0533) float(1298068218.7475)
float(1298065510.0405) float(1298068225.1549)
float(1298065510.038) float(1298068231.7615)
float(1298065510.0269) float(1298068237.0667)
float(1298065510.0234) float(1298068244.8534)
float(1298065510.0266) float(1298068250.9826)
float(1298065510.0145) float(1298068257.6404)
float(1298065510.8087) float(1298068265.3026)
float(1298065510.809) float(1298068271.1601)
float(1298065510.8087) float(1298068277.0327)
float(1298065510.8029) float(1298068284.6319)
...
------------------------------------------------------------------------
[2011-02-18 22:32:24] nospam at unclassified dot de
I have restarted the Apache web server and then the microtime function worked
correctly in this situation a few times. Then it started to produce the same
bogus data often. Now the original problem is right here again. Same place.
Only the approximately 100th of like 200 times it is called. Instead of
1298064639.9228 (or similar) as everywhere else on the page it returns values
around 1296908080.167 or 1296908081.2987. Quite a bit off but relatively
"constant".
------------------------------------------------------------------------
[2011-02-18 22:17:00] nospam at unclassified dot de
Description:
------------
I have a very weird bug here. The microtime() function with the parameter true
works fine everywhere in my entire application - except in one single place.
It's measuring database query durations here. It counts everything perfectly
but always at a certain database query in the deepest middle of my application
it returns random values. When I call it a second time just a line of code
later, it returns the correct value again. It happens every time tonight. I
cannot provide a testcase yet because there's another tens of thousands of
lines of code hanging at this to work at all.
I cannot upgrade PHP because there's no newer XAMPP package available. Version
is 5.3.1.
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