(PECL xattr >= 0.9.0)
xattr_get — Get an extended attribute
$filename
   , string $name
   [, int $flags = 0
  ] ) : stringThis 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。
filenameThe file from which we get the attribute.
nameThe 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);
/* ... check if $signature is valid ... */
?>