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# CXXXIII. xattr Functions

# 介紹

The xattr extension allows for the manipulation of extended attributes on a filesystem.

# 需求

To use xattr, you will need libattr installed. It is available at http://oss.sgi.com/projects/xfs/.

> 注: These functions only work on filesystems that support extended attributes, and have them enabled at mount time. Some common filesystems that support extended attributes are ext2, ext3, reiserfs, jfs, and xfs.

# 安裝

xattr is currently available through PECL http://pecl.php.net/package/xattr.

If PEAR is available on your *nix-like system you can use the pear installer to install the xattr extension, by the following command: pear -v install xattr.

You can always download the tar.gz package and install xattr by hand:

範例 1. xattr install by hand

    gunzip xattr-xxx.tgz
    tar -xvf xattr-xxx.tar
    cd xattr-xxx
    phpize
    ./configure && make && make install

# 預先定義常數

以下的常數由此延伸定義，只在這個延伸被編譯成PHP或實行時期被動態載入時有效。

`XATTR_ROOT` (integer)

  Set attribute in root (trusted) namespace. Requires root privileges.

`XATTR_DONTFOLLOW` (integer)

  Do not follow the symbolic link but operate on symbolic link itself.

`XATTR_CREATE` (integer)

  Function will fail if extended attribute already exists.

`XATTR_REPLACE` (integer)

  Function will fail if extended attribute doesn't exist.

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