Edit report at https://bugs.php.net/bug.php?id=72517&edit=1
ID: 72517
Updated by: php-bugs@lists.php.net
Reported by: stgrein at gmail dot com
Summary: file_exists(), is_file() and stat() report wrong
result infrequently (~1%)
-Status: Feedback
+Status: No Feedback
Type: Bug
Package: Filesystem function related
Operating System: Windows
PHP Version: 7.0.8
Private report: N
New Comment:
No feedback was provided. The bug is being suspended because
we assume that you are no longer experiencing the problem.
If this is not the case and you are able to provide the
information that was requested earlier, please do so and
change the status of the bug back to "Re-Opened". Thank you.
Previous Comments:
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[2016-06-30 07:50:05] requinix@php.net
Here's a cmd command to repeat the test 10k times:
(for /l %i in (1,1,10000) do php -r
"var_dump(file_exists('/this/file/exists'));") | find /c "true"
Naturally it needs to be run from where you have PHP installed (or give the path to php.exe) and you
need to change the /this/file/exists path.
If you run that, does it show 10000 or something less? What if the system and/or disk is under load?
Also, if you're getting this behavior with regular PHP code, are you potentially creating that
file first? Because PHP will cache stat information during execution; if you are creating the file
then use clearstatcache() before re-testing for the presence of the file.
http://php.net/manual/en/function.clearstatcache.php
Also, testing with PHP 5.5 or 5.6 would be appreciated.
------------------------------------------------------------------------
[2016-06-29 20:10:28] stgrein at gmail dot com
Additional information:
I used the VC14 x64 Thread Safe build from windows.php.net
------------------------------------------------------------------------
[2016-06-29 20:08:20] stgrein at gmail dot com
Description:
------------
Hi,
functions which check if a file exists do report wrong results sometimes.
I did not find a special pattern, but maybe higher load is triggering it more.
The chance on my machine is around ~1% to hit the bug per function call.
I am using PHP v7.0.8 now but also had this bug on PHP v7.0.7. I did not test with earlier Versions.
Test script:
---------------
<?php
//check an existing file
$a = file_exists("/this/file/exists");
if($a === true) {
echo "File exists!"; //expected
} else {
echo "File does NOT exists!"; //bug hit
}
//expected output:
//File exists!
//chance to get this output is around 1% on my machine under load
//File does NOT exists!
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Edit this bug report at https://bugs.php.net/bug.php?id=72517&edit=1