xattr_get
(PECL xattr:0.9-1.0)
xattr_get — Get an extended attribute
說明
string xattr_get
( string $filename
, string $name
[, int $flags
] )
This function gets the value of an extended attribute of a file.
擴充功能的屬性有兩個不同的名稱空間：user 和 root 名稱空間。user 名稱空間對所有用戶均有效，而 root 名稱空間僅對擁有 root 權限的用戶有效。xattr 預設在 user 名稱空間上進行操作，但是可以使用 flags 參數進行更改。
參數
- filename
-
The file from which we get the attribute.
- name
-
The name of the attribute.
- flags
-
Supported xattr 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.
Return值
Returns a string containing the value or FALSE if the attribute doesn't exist.
範例
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 ... */
?>