xattr_get
(PECL xattr >= 0.9.0)
xattr_get — Get an extended attribute
Description
string xattr_get
( string
$filename
, string $name
[, int $flags = 0
] )This function gets the value of an extended attribute of a file.
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 from which we get the attribute.
-
name -
The name of the attribute.
-
flags -
Supported xattr flags XATTR_DONTFOLLOWDo not follow the symbolic link but operate on symbolic link itself. XATTR_ROOTSet attribute in root (trusted) namespace. Requires root privileges.
Return Values
Returns a string containing the value or FALSE if the attribute doesn't
exist.
Examples
Example #1 Checks if system administrator has signed the file
<?php
$file = '/usr/local/sbin/some_binary';
$signature = xattr_get($file, 'Root signature', XATTR_ROOT);
/* ... check if $signature is valid ... */
?>
See Also
- xattr_list() - Get a list of extended attributes
- xattr_set() - Set an extended attribute
- xattr_remove() - Remove an extended attribute
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