fileperms
Gets file permissions
Description
intfalse fileperms(string $filename
)
Parameters
-
filename
-
Path to the file.
Return Values
Returns the file's permissions as a numeric mode. Lower bits of this mode
are the same as the permissions expected by chmod,
however on most platforms the return value will also include information on
the type of file given as filename
. The examples
below demonstrate how to test the return value for specific permissions and
file types on POSIX systems, including Linux and macOS.
For local files, the specific return value is that of the
st_mode
member of the structure returned by the C
library's stat function. Exactly which bits are set
can vary from platform to platform, and looking up your specific platform's
documentation is recommended if parsing the non-permission bits of the
return value is required.
Returns false
on failure.
Errors/Exceptions
Upon failure, an E_WARNING
is emitted.
Examples
Example #1 Display permissions as an octal value
<?php
echo substr(sprintf('%o', fileperms('/tmp')), -4);
echo substr(sprintf('%o', fileperms('/etc/passwd')), -4);
?>
The above example will output:
Example #2 Display full permissions
<?php
$perms = fileperms('/etc/passwd');
switch ($perms & 0xF000) {
case 0xC000: // socket
$info = 's';
break;
case 0xA000: // symbolic link
$info = 'l';
break;
case 0x8000: // regular
$info = 'r';
break;
case 0x6000: // block special
$info = 'b';
break;
case 0x4000: // directory
$info = 'd';
break;
case 0x2000: // character special
$info = 'c';
break;
case 0x1000: // FIFO pipe
$info = 'p';
break;
default: // unknown
$info = 'u';
}
// Owner
$info .= (($perms & 0x0100) ? 'r' : '-');
$info .= (($perms & 0x0080) ? 'w' : '-');
$info .= (($perms & 0x0040) ?
(($perms & 0x0800) ? 's' : 'x' ) :
(($perms & 0x0800) ? 'S' : '-'));
// Group
$info .= (($perms & 0x0020) ? 'r' : '-');
$info .= (($perms & 0x0010) ? 'w' : '-');
$info .= (($perms & 0x0008) ?
(($perms & 0x0400) ? 's' : 'x' ) :
(($perms & 0x0400) ? 'S' : '-'));
// World
$info .= (($perms & 0x0004) ? 'r' : '-');
$info .= (($perms & 0x0002) ? 'w' : '-');
$info .= (($perms & 0x0001) ?
(($perms & 0x0200) ? 't' : 'x' ) :
(($perms & 0x0200) ? 'T' : '-'));
echo $info;
?>
The above example will output:
Notes
Note: The results of this
function are cached. See clearstatcache for
more details.
TipAs 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.