xattr_set
(PECL xattr >= 0.9.0)
xattr_set — Set an extended attribute
说明
xattr_set (
string
$filename ,
string $name ,
string $value [,
int $flags = 0 ] ) :
bool
This function sets 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 in which we set the attribute.
-
name -
The name of the extended attribute. This attribute will be created if it doesn't exist or replaced otherwise. You can change this behaviour by using the
flagsparameter. -
value -
The value of the attribute.
-
flags -
Supported xattr flags XATTR_CREATEFunction will fail if extended attribute already exists. XATTR_REPLACEFunction will fail if extended attribute doesn't exist. XATTR_DONTFOLLOWDo not follow the symbolic link but operate on symbolic link itself. XATTR_ROOTSet attribute in root (trusted) namespace. Requires root privileges.
返回值
成功时返回 TRUE， 或者在失败时返回 FALSE。
范例
Example #1 Sets extended attributes on .wav file
<?php
$file = 'my_favourite_song.wav';
xattr_set($file, 'Artist', 'Someone');
xattr_set($file, 'My ranking', 'Good');
xattr_set($file, 'Listen count', '34');
/* ... other code ... */
printf("You've played this song %d times", xattr_get($file, 'Listen count'));
?>
