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