Installing/Configuring
PHP Manual

Requirements

To use xattr, you will need libattr installed. It is available at » http://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.


Installing/Configuring
PHP Manual