预定义常量
下列常量由此扩展定义,且仅在此扩展编译入 PHP 或在运行时动态载入时可用。
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XATTR_ROOT
(integer) - Set attribute in root (trusted) namespace. Requires root privileges.
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XATTR_DONTFOLLOW
(integer) - Do not follow the symbolic link but operate on symbolic link itself.
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XATTR_CREATE
(integer) - Function will fail if extended attribute already exists.
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XATTR_REPLACE
(integer) - Function will fail if extended attribute doesn't exist.