預定義常量

下列常量由此擴展定義，且僅在此擴展編譯入 PHP 或在運行時動態(tài)載入時可用。

XATTR_ROOT (int)

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

XATTR_DONTFOLLOW (int)

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

XATTR_CREATE (int)

Function will fail if extended attribute already exists.

XATTR_REPLACE (int)

Function will fail if extended attribute doesn't exist.