Bug #48062 [Com]: file_exists() and clearstatcache() not working on network volume

From: Date: Mon, 10 Aug 2015 03:03:18 +0000
Subject: Bug #48062 [Com]: file_exists() and clearstatcache() not working on network volume
References: 1  Groups: php.bugs 
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Edit report at https://bugs.php.net/bug.php?id=48062&edit=1

 ID:                 48062
 Comment by:         p dot dolgov at infocomdv dot ru
 Reported by:        dlafond at lenouvelliste dot qc dot ca
 Summary:            file_exists() and clearstatcache() not working on
                     network volume
 Status:             No Feedback
 Type:               Bug
 Package:            Filesystem function related
 Operating System:   MacOSX Server 10.5.6
 PHP Version:        5.2.9
 Block user comment: N
 Private report:     N

 New Comment:

Experiencing the same problem.

clearstatcache() does not clear cache for file_exists() and is_file().

Sample code:
$path = /images/logo.png;
clearstatcache();
if( file_exists($path) ) // also tried file_exists(realpath($path))
    $exists = true;	
else 
    $exists = false;		
clearstatcache();
echo "file is $path <br>";
echo "file exists is $exists";


Previous Comments:
------------------------------------------------------------------------
[2009-05-14 01:00:01] php-bugs at lists dot php dot net

No feedback was provided for this bug for over a week, so it is
being suspended automatically. If you are able to provide the
information that was originally requested, please do so and change
the status of the bug back to "Open".

------------------------------------------------------------------------
[2009-05-06 18:53:18] jani@php.net

Can you try this:

# CFLAGS=getconf LFS_CFLAGS ./config.nice
# make clean && make

This is from bug #45040 which I think this is kind of duplicate report 
now. :)

------------------------------------------------------------------------
[2009-04-28 13:41:02] dlafond at lenouvelliste dot qc dot ca

A workaround to get rid of this persistent stat cache when using 
file_exists is to combine the file_exists function with the function 
realpath().

$ttt="/Volumes/testdaniel/ttt.txt";
if(file_exists(realpath($ttt))){
   echo "exists";
}else{
   echo "not exists";
}

------------------------------------------------------------------------
[2009-04-27 15:30:57] jani@php.net

Same issue as in bug #46245

------------------------------------------------------------------------
[2009-04-23 15:39:27] dlafond at lenouvelliste dot qc dot ca

Description:
------------
When files are saved on AFP or SMB mounted sharing, file_exists() and 
clearstatcache() function are not working as expected. No problem when 
files are saved on local disk. On AFP or SMB volume, file_exists 
continue to return true when the file is deleted outside of PHP. 
clearstatcache() function seems to have no effect.

But, if the file is deleted with the unlink() function in php, 
file_exists return false.







Reproduce code:
---------------
<?
header("Content-type: text/html");
header("Expires: Mon, 26 Jul 1997 05:00:00 GMT");
header("Cache-Control: no-store, no-cache,must-revalidate");
header("Cache-Control: post-check=0, pre-check=0",false);
header("Pragma: no-cache");


clearstatcache();

$ttt="/Volumes/testdaniel/ttt.txt";
#exec("touch ".$ttt);
#@unlink($ttt);

if(file_exists($ttt)){
   echo "exists";
}else{
   echo "not exists";
}
clearstatcache();

?>

Expected result:
----------------
"exists" when file really exists
"not exists" when file doesn't exists

Actual result:
--------------
"exists" even after the file was deleted


------------------------------------------------------------------------



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