08-13-2012
Almost is not absolute.
Yes I have seen systems without it as well, but they typically deselect or remove after the fact. And then again, just change the perms on the vi executable and it is disabled.
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LEARN ABOUT PHP
fileperms
FILEPERMS(3) 1 FILEPERMS(3)
fileperms - Gets file permissions
SYNOPSIS
int fileperms (string $filename)
DESCRIPTION
Gets permissions for the given file.
PARAMETERS
o $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(3), 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 Mac OS X.
For local files, the specific return value is that of the st_mode member of the structure returned by the C library's stat(3) 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.
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:
1777
0644
Example #2
Display full permissions
<?php
$perms = fileperms('/etc/passwd');
if (($perms & 0xC000) == 0xC000) {
// Socket
$info = 's';
} elseif (($perms & 0xA000) == 0xA000) {
// Symbolic Link
$info = 'l';
} elseif (($perms & 0x8000) == 0x8000) {
// Regular
$info = '-';
} elseif (($perms & 0x6000) == 0x6000) {
// Block special
$info = 'b';
} elseif (($perms & 0x4000) == 0x4000) {
// Directory
$info = 'd';
} elseif (($perms & 0x2000) == 0x2000) {
// Character special
$info = 'c';
} elseif (($perms & 0x1000) == 0x1000) {
// FIFO pipe
$info = 'p';
} else {
// 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:
-rw-r--r--
ERRORS
/EXCEPTIONS
Upon failure, an E_WARNING is emitted.
NOTES
Note
The results of this function are cached. See clearstatcache(3) for more details.
Tip
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(3) family of functionality.
SEE ALSO
chmod(3), is_readable(3), stat(3).
PHP Documentation Group FILEPERMS(3)