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Gives information about a file
(PHP 4, PHP 5, PECL maxdb:7.5.00.24-7.6.00.38)
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To the note of how you can figure out if a file is a folder or not, there is also the handy "is_dir" function.
admin
There's an important (yet little-known) problem with file dates on Windows and Daylight Savings. This affects the 'atime' and 'mtime' elements returned by stat(), and it also affects other filesystem-related functions such as fileatime() and filemtime(). During the winter months (when Daylight Savings isn't in effect), Windows will report a certain timestamp for a given file. However, when summer comes and Daylight Savings starts, Windows will report a DIFFERENT timestamp! Even if the file hasn't been altered at all, Windows will shift every timestamp it reads forward one full hour during Daylight Savings. This all stems from the fact that M$ decided to use a hackneyed method of tracking file dates to make sure there are no ambiguous times during the "repeated hour" when DST ends in October, maintain compatibility with older FAT partitions, etc. An excellent description of what/why this is can be found at http://www.codeproject.com/datetime/dstbugs.asp This is noteworthy because *nix platforms don't have this problem. This could introduce some hard-to-track bugs if you're trying to move scripts that track file timestamps between platforms. I spent a fair amount of time trying to debug one of my own scripts that was suffering from this problem. I was storing file modification times in a MySQL table, then using that information to see which files had been altered since the last run of the script. After each Daylight Savings change, every single file the script saw was considered "changed" since the last run, since all the timestamps were off by +/- 3600 seconds. This one-liner is probably one of the most incorrect fixes that could ever be devised, but it's worked flawlessly in production-grade environments... Assuming $file_date is a Unix timestamp you've just read from a file: <?php if (date('I') == 1) $file_date -= 3600; ?> That will ensure that the timestamp you're working with is always consistently reported, regardless of whether the machine is in Daylight Savings or not. juliec
The dir_size function provided by "marting.dc AT gmail.com" works great, except the $mas variable is not initialized. Add: $mas = 0; before the while() loop. piranha-php dot net
stat() returns a file's _status_, not its _statistics_. "Statistics" implies information interpreted from the data of several files, not concrete meaning from a single file. Both Linux and POSIX manual pages for stat() list the name as "stat - get file status," and do not mention the word "statistic" anywhere.
guillermo martinez
stat() and SELinux, You can have troubles to use the stat() function if the SELinux is enabled, so check the SELinux documentation or turn it off. hugues dot larrive
salisbm at hotmail dot com said : (...)to see if the file is a directory, after calling fstat, I do: if ($fstats[mode] & 040000) ... this must be a directory Then I say no no no no... it can be a directory or a named pipe, or a block spécial ... The good code for this thing is : <? if(($fstat['mode'] & 0170000) == 040000) echo "Be sure it is a directory !"; ?> Sorry for very ugly english ;) @+ com dot gmail
Re note posted by "salisbm at hotmail dot com": S_IFDIR is not a single-bit flag. It is a constant that relies on the "S_IFMT" bitmask. This bitmask should be applied to the "mode" parameter before comparing with any of the other "S_IF..." constants, as indicated by stat.h: #define S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR) That is, this approach is incorrect: <?php define('S_IFDIR',040000); if ($mode & S_IFDIR) { /* incorrect! format could be S_IFDIR, but also S_IFBLK, S_IFSOCK, or S_IFWHT. */ } ?> ...and should instead be: <?php define('S_IFMT',0170000); define('S_IFDIR',040000); if (S_IFDIR == ($mode & S_IFMT)) { /* ... */ } ?> As pointed out by "svend at svendtofte dot com", however, there is also the "is_dir" function for this purpose, along with "is_file" and "is_link" to cover the most common format types... 16-may-2006 06:10
Re note posted by "admin at smitelli dot com" I'm not sure how that can work all year round since you have to modify both opposing inside and outside DST based on the actual files themselves, as well as the current DST setting for the system. e.g. using filemtime, same thing for stat. <?php $mtime = filemtime($file); if (date('I') == 1) { // Win DST is enabled, adjust standard time // files back to 'real' file UTC. if (date('I', $mtime) == 0) { $mtime -= 3600; } } else { // Win DST is disabled, adjust daylight time // files forward to 'real' file UTC. if (date('I', $mtime) == 1) { $mtime += 3600; } } echo gmdate('Y-m-d H:i:s', $mtime); ?> Just another example of why 'not' to use windows in a server room. marting.dc
If you want to know a directory size, this function will help you: <? function dir_size($dir) { $handle = opendir($dir); while ($file = readdir($handle)) { if ($file != '..' && $file != '.' && !is_dir($dir.'/'.$file)) { $mas += filesize($dir.'/'.$file); } else if (is_dir($dir.'/'.$file) && $file != '..' && $file != '.') { $mas += dir_size($dir.'/'.$file); } } return $mas; } echo dir_size('DIRECTORIO').' Bytes'; ?> mao
If you have ftp (and the related sftp) protocols disabled on your remote server, it can be hard figuring out how to 'stat' a remote file. The following works for me: <?php $conn = ssh2_connect($host, 22); ssh2_auth_password($conn, $user, $password); $stream = ssh2_exec($conn, "stat $fileName > $remotedest"); ssh2_scp_recv($conn, $remotedest, $localdest); $farray = file($localdest); print_r($farray); ?> mpb dot mail
If you are working with files larger than 2GB (and PHP's integer type is only 32 bits on your system) then you can try the following to get floating point sizes: On FreeBSD: $size = (float) exec ('stat -f %z '. escapeshellarg ($path)); On Linux: $size = (float) exec ('stat -c %s '. escapeshellarg ($path)); (The other example that uses "ls" and "awk" does not properly escape the filename, but should work otherwise.) 11-nov-2004 03:41
If the 2GB limit is driving you crazy, you can use this complete hack. use in place of filesize() function file_size($file) { $size = filesize($file); if ( $size == 0) $size = exec("ls -l $file | awk '{print $5}'"); return $size; } salisbm
I was curious how I could tell if a file was a directory... so I found on http://www.hmug.org/man/2/stat.html the following information about the mode bits: #define S_IFMT 0170000 /* type of file */ #define S_IFIFO 0010000 /* named pipe (fifo) */ #define S_IFCHR 0020000 /* character special */ #define S_IFDIR 0040000 /* directory */ #define S_IFBLK 0060000 /* block special */ #define S_IFREG 0100000 /* regular */ #define S_IFLNK 0120000 /* symbolic link */ #define S_IFSOCK 0140000 /* socket */ #define S_IFWHT 0160000 /* whiteout */ #define S_ISUID 0004000 /* set user id on execution */ #define S_ISGID 0002000 /* set group id on execution */ #define S_ISVTX 0001000 /* save swapped text even after use */ #define S_IRUSR 0000400 /* read permission, owner */ #define S_IWUSR 0000200 /* write permission, owner */ #define S_IXUSR 0000100 /* execute/search permission, owner */ Note that these numbers are in octal format. Then, to check to see if the file is a directory, after calling fstat, I do: if ($fstats[mode] & 040000) ... this must be a directory ian
Here's what the UNIX man page on stat has to say about the difference between a file change and a file modification: st_mtime Time when data was last modified. Changed by the following functions: creat(), mknod(), pipe(), utime(), and write(2). st_ctime Time when file status was last changed. Changed by the following functions: chmod(), chown(), creat(), link(2), mknod(), pipe(), unlink(2), utime(), and write(). So a modification is a change in the data, whereas a change also happens if you modify file permissions and so on. |
Change Language
basename chgrp chmod chown clearstatcache copy delete dirname disk_free_space disk_total_space diskfreespace fclose feof fflush fgetc fgetcsv fgets fgetss file_exists file_get_contents file_put_contents file fileatime filectime filegroup fileinode filemtime fileowner fileperms filesize filetype flock fnmatch fopen fpassthru fputcsv fputs fread fscanf fseek fstat ftell ftruncate fwrite glob is_dir is_executable is_file is_link is_readable is_uploaded_file is_writable is_writeable lchgrp lchown link linkinfo lstat mkdir move_uploaded_file parse_ini_file pathinfo pclose popen readfile readlink realpath rename rewind rmdir set_file_buffer stat symlink tempnam tmpfile touch umask unlink |
