stat
(PHP 4, PHP 5, PHP 7, PHP 8)
stat — Gives information about a file
Description
$filename): array|false
Gathers the statistics of the file named by
filename. If filename is a
symbolic link, statistics are from the file itself, not the symlink.
Prior to PHP 7.4.0, on Windows NTS builds the size,
atime, mtime and ctime
statistics have been from the symlink, in this case.
lstat() is identical to stat() except it would instead be based off the symlinks status.
Parameters
-
filename -
Path to the file.
Return Values
| Numeric | Associative | Description |
|---|---|---|
| 0 | dev | device number *** |
| 1 | ino | inode number **** |
| 2 | mode | inode protection mode ***** |
| 3 | nlink | number of links |
| 4 | uid | userid of owner * |
| 5 | gid | groupid of owner * |
| 6 | rdev | device type, if inode device |
| 7 | size | size in bytes |
| 8 | atime | time of last access (Unix timestamp) |
| 9 | mtime | time of last modification (Unix timestamp) |
| 10 | ctime | time of last inode change (Unix timestamp) |
| 11 | blksize | blocksize of filesystem IO ** |
| 12 | blocks | number of 512-byte blocks allocated ** |
* On Windows this will always be 0.
** Only valid on systems supporting the st_blksize type - other
systems (e.g. Windows) return -1.
*** On Windows, as of PHP 7.4.0, this is the serial number of the volume that contains the file,
which is a 64-bit unsigned integer, so may overflow.
Previously, it was the numeric representation of the drive letter (e.g. 2
for C:) for stat(), and 0 for
lstat().
**** On Windows, as of PHP 7.4.0, this is the identifier associated with the file,
which is a 64-bit unsigned integer, so may overflow.
Previously, it was always 0.
***** On Windows, the writable permission bit is set according to the read-only file attribute, and the same value is reported for all users, group and owner. The ACL is not taken into account, contrary to is_writable().
The value of mode contains information read by several functions.
When written in octal, starting from the right, the first three digits are returned by
chmod(). The next digit is ignored by PHP. The next two digits indicate
the file type:
mode in octal |
Meaning |
|---|---|
0140000 |
socket |
0120000 |
link |
0100000 |
regular file |
0060000 |
block device |
0040000 |
directory |
0020000 |
character device |
0010000 |
fifo |
0100644 and a directory could be
0040755.
In case of error, stat() returns false.
Note: Because PHP's integer type is signed and many platforms use 32bit integers, some filesystem functions may return unexpected results for files which are larger than 2GB.
Errors/Exceptions
Upon failure, an E_WARNING is emitted.
Changelog
| Version | Description |
|---|---|
| 7.4.0 | On Windows, the device number is now the serial number of the volume that contains the file, and the inode number is the identifier associated with the file. |
| 7.4.0 |
The size, atime, mtime and
ctime statistics of symlinks are always those of the target.
This was previously not the case for NTS builds on Windows.
|
Examples
Example #1 stat() example
<?php
/* Get file stat */
$stat = stat('C:\php\php.exe');
/*
* Print file access time, this is the same
* as calling fileatime()
*/
echo 'Access time: ' . $stat['atime'];
/*
* Print file modification time, this is the
* same as calling filemtime()
*/
echo 'Modification time: ' . $stat['mtime'];
/* Print the device number */
echo 'Device number: ' . $stat['dev'];
?>
Example #2 Using stat() information together with touch()
<?php
/* Get file stat */
$stat = stat('C:\php\php.exe');
/* Did we failed to get stat information? */
if (!$stat) {
echo 'stat() call failed...';
} else {
/*
* We want the access time to be 1 week
* after the current access time.
*/
$atime = $stat['atime'] + 604800;
/* Touch the file */
if (!touch('some_file.txt', time(), $atime)) {
echo 'Failed to touch file...';
} else {
echo 'touch() returned success...';
}
}
?>
Notes
Note:
Note that time resolution may differ from one file system to another.
Note: The results of this function are cached. See clearstatcache() for more details.
As of PHP 5.0.0, this function can also be used with some URL wrappers. Refer to Supported Protocols and Wrappers to determine which wrappers support stat() family of functionality.
See Also
- lstat() - Gives information about a file or symbolic link
- fstat() - Gets information about a file using an open file pointer
- filemtime() - Gets file modification time
- filegroup() - Gets file group
- SplFileInfo
