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(PECL xattr >= 0.9.0)
xattr_get — Get an extended attribute
$filename
, string $name
[, int $flags
= 0
] )This function gets the value of an extended attribute of a file.
扩展的属性有两种 不同的命名空间:user
和 root。user 命名空间对所有用户均有效,而 root
命名空间仅对拥有 root 权限的用户有效。
xattr 默认在 user 命名空间上操作,但可使用
flags
参数进行更改。
filename
The file from which we get the attribute.
name
The name of the attribute.
flags
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. |
Returns a string containing the value or FALSE
if the attribute doesn't
exist.
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 );
?>