xattr_set
Set an extended attribute
Description
bool xattr_set(
string $filename,
string $name,
string $value,
int $flags = 0
)
Extended attributes have two different namespaces: user
and root. The user namespace is available to all users, while the root namespace
is available only to users with root privileges. xattr operates on the user
namespace by default, but this can be changed with the
flags parameter.
Parameters
-
filename
-
The file in which we set the attribute.
-
name
-
The name of the extended attribute. This attribute will be created if
it doesn't exist or replaced otherwise. You can change this behaviour
by using the flags parameter.
-
value
-
The value of the attribute.
-
flags
-
Supported xattr flags
XATTR_CREATE |
Function will fail if extended attribute already exists. |
XATTR_REPLACE |
Function will fail if extended attribute doesn't exist. |
XATTR_DONTFOLLOW |
Do not follow the symbolic link but operate on symbolic link itself. |
XATTR_ROOT |
Set attribute in root (trusted) namespace. Requires root privileges. |
Return Values
Returns true on success or false on failure.
Examples
Example #1 Sets extended attributes on .wav file
<?php
$file = 'my_favourite_song.wav';
xattr_set($file, 'Artist', 'Someone');
xattr_set($file, 'My ranking', 'Good');
xattr_set($file, 'Listen count', '34');
/* ... other code ... */
printf("You've played this song %d times", xattr_get($file, 'Listen count'));
?>