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 » https://oss.sgi.com/projects/xfs/.
Note: 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 » https://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:
Example#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.
Table of Contents
- xattr_get — Get an extended attribute
- xattr_list — Get a list of extended attributes
- xattr_remove — Remove an extended attribute
- xattr_set — Set an extended attribute
- xattr_supported — Check if filesystem supports extended attributes