Bug #70943 [Com]: fopen() can't open a file if path is 259 characters long
Edit report at https://bugs.php.net/bug.php?id=70943&edit=1
ID: 70943
Comment by: tomas dot fejfar at gmail dot com
Reported by: emanuele at fondani dot it
Summary: fopen() can't open a file if path is 259 characters
long
Status: Open
Type: Bug
Package: Filesystem function related
Operating System: Windows 10
PHP Version: 5.6.15
Block user comment: N
Private report: N
New Comment:
Based on https://msdn.microsoft.com/en-us/library/windows/desktop/aa365247%28v=vs.85%29.aspx?f=255&MSPPError=-2147217396
it seems that prepending the path with '\\?\' should fix it. But it does not seem to write
through PHP.
Previous Comments:
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[2015-12-19 13:47:23] emanuele at fondani dot it
I think it's a bug because, as noted by webmaster at tubo-world dot de, for files with a path
of 259 characters, there is an inconsistent behaviour among different php file functions. Some
support it and some don't.
Anyway, path lengths of 259 characters (260, including null terminator) should be supported on
Windows, as they are within the allowed maximum path length.
------------------------------------------------------------------------
[2015-12-19 01:39:22] ajf@php.net
I'm wondering if this is more a request than a bug. The current behaviour is not wrong per se,
it's just a limitation of the specific Windows APIs in use.
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[2015-12-19 01:08:17] webmaster at tubo-world dot de
I confirm the problem and investigated which filesystem functions work with different lengths of
filenames. In theory filesnames up to 259 length should work on Windows as it is below the 260
MAX_PATH length (including terminating null char). I could find out that some functions work with
length 259 (touch, rename, file_exists etc), while other functions fail (copy, fopen, realpath,
file_put_contents) for the same filename. So for these functions PHP does seem to do something
inconsistently in a bad way which causes hard to debug problems.
Test script:
------------
<?php
$tmpDir = sys_get_temp_dir() . DIRECTORY_SEPARATOR;
$tmpDirLen = strlen($tmpDir);
foreach (array(258, 259, 260) as $fileLen) {
$filename = $tmpDir . str_repeat('a', $fileLen - $tmpDirLen);
var_dump($filename);
echo 'touch: ';
var_dump(@touch($filename));
echo 'chmod: ';
var_dump(@chmod($filename, 0666));
echo 'file_exists: ';
var_dump(file_exists($filename));
echo 'is_file: ';
var_dump(is_file($filename));
echo 'stat: ';
var_dump(@stat($filename) ? true : false);
echo 'realpath: ';
var_dump(realpath($filename) ? true : false);
echo 'fopen: ';
var_dump(($handle = @fopen($filename, 'r')) ? true : false);
if ($handle) {
fclose($handle);
}
echo 'unlink: ';
var_dump(@unlink($filename));
$tmpFile = tempnam(sys_get_temp_dir(), 'tmp');
echo 'copy: ';
var_dump(@copy($tmpFile, $filename));
echo 'file_put_contents: ';
var_dump(@file_put_contents($filename, 'test data') ? true : false);
echo 'rename: ';
var_dump($rename = @rename($tmpFile, $filename));
unlink($rename ? $filename : $tmpFile);
echo "\n\n";
}
Expected result:
----------------
string(258) "..."
touch: bool(true)
chmod: bool(true)
file_exists: bool(true)
is_file: bool(true)
stat: bool(true)
realpath: bool(true)
fopen: bool(true)
unlink: bool(true)
copy: bool(true)
file_put_contents: bool(true)
rename: bool(true)
string(259) "..."
touch: bool(true)
chmod: bool(true)
file_exists: bool(true)
is_file: bool(true)
stat: bool(true)
realpath: bool(true)
fopen: bool(true)
unlink: bool(true)
copy: bool(true)
file_put_contents: bool(true)
rename: bool(true)
string(260) "..."
touch: bool(false)
chmod: bool(false)
file_exists: bool(false)
is_file: bool(false)
stat: bool(false)
realpath: bool(false)
fopen: bool(false)
unlink: bool(false)
copy: bool(false)
file_put_contents: bool(false)
rename: bool(false)
Actual result:
--------------
string(258) "..."
touch: bool(true)
chmod: bool(true)
file_exists: bool(true)
is_file: bool(true)
stat: bool(true)
realpath: bool(true)
fopen: bool(true)
unlink: bool(true)
copy: bool(true)
file_put_contents: bool(true)
rename: bool(true)
string(259) "..."
touch: bool(true)
chmod: bool(true)
file_exists: bool(true)
is_file: bool(true)
stat: bool(true)
realpath: bool(false)
fopen: bool(false)
unlink: bool(true)
copy: bool(false)
file_put_contents: bool(false)
rename: bool(true)
string(260) "..."
touch: bool(false)
chmod: bool(false)
file_exists: bool(false)
is_file: bool(false)
stat: bool(false)
realpath: bool(false)
fopen: bool(false)
unlink: bool(false)
copy: bool(false)
file_put_contents: bool(false)
rename: bool(false)
------------------------------------------------------------------------
[2015-12-18 22:43:46] nathanael at gnat dot ca
I have the same problem on Windows Server 2008, php 5.6.16
------------------------------------------------------------------------
[2015-12-08 07:58:30] a dot ehrsam at hotmail dot com
I think we have the following limitation of Windows: https://msdn.microsoft.com/en-us/library/windows/desktop/aa365247(v=vs.85).aspx#maxpath
. This has been a discussion for .NET as well: https://github.com/dotnet/corefx/issues/645
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