PHP 7.1.21 Released

xattr_get

(PECL xattr >= 0.9.0)

xattr_get Get an extended attribute

说明

string xattr_get ( string $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。

参数

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.

返回值

Returns a string containing the value or FALSE if the attribute doesn't exist.

范例

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 ... */

?>

参见

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