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: ajf@php.net 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: 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. Previous Comments: ------------------------------------------------------------------------ [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 ------------------------------------------------------------------------ [2015-12-08 06:52:45] yohgaki@php.net Note: Most file systems support up to 255 chars for file names. Path length are unlimited mostly. https://en.wikipedia.org/wiki/Comparison_of_file_systems ------------------------------------------------------------------------ [2015-11-30 07:06:45] adrian dot ehrsam at students dot fhnw dot ch This is an issue of composer as well: https://github.com/composer/composer/issues/4628 . It is the well-known Windows Long path Issue that can be fixed. ------------------------------------------------------------------------ The remainder of the comments for this report are too long. To view the rest of the comments, please view the bug report online at https://bugs.php.net/bug.php?id=70943 -- Edit this bug report at https://bugs.php.net/bug.php?id=70943&edit=1