(PECL xattr >= 0.9.0)
xattr_set — Set an extended attribute
$filename,$name,$value,$flags = 0This function sets the value of an extended attribute of a file.
擴展的屬性有兩種 不同的命名空間：user
和 root。user 命名空間對所有用戶(hù)均有效，而 root
命名空間僅對擁有 root 權限的用戶(hù)有效。
xattr 默認在 user 命名空間上操作，但可使用
flags 參數進(jìn)行更改。
filenameThe 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 flags parameter.
valueThe value of the attribute.
flags
XATTR_CREATE |
Function will fail if extended attribute already exists. |
XATTR_REPLACE |
Function will fail if extended attribute doesn't exist. |
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. |
成功時(shí)返回 true， 或者在失敗時(shí)返回 false。
示例 #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'));
?>