Predefined Constants
The constants below are defined by this extension, and will only be available when the extension has either been compiled into PHP or dynamically loaded at runtime.
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XATTR_ROOT(int) - Set attribute in root (trusted) namespace. Requires root privileges.
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XATTR_DONTFOLLOW(int) - Do not follow the symbolic link but operate on symbolic link itself.
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XATTR_CREATE(int) - Function will fail if extended attribute already exists.
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XATTR_REPLACE(int) - Function will fail if extended attribute doesn't exist.

