Rar
PHP Manual

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.

RAR_HOST_MSDOS (integer)
Use RarEntry::HOST_MSDOS instead.
RAR_HOST_OS2 (integer)
Use RarEntry::HOST_OS2 instead.
RAR_HOST_WIN32 (integer)
Use RarEntry::HOST_WIN32 instead.
RAR_HOST_UNIX (integer)
Use RarEntry::HOST_UNIX instead.
RAR_HOST_BEOS (integer)
Use RarEntry::HOST_BEOS instead.

Rar
PHP Manual