Also you can use the PECL installer to install the Rar extension,
using the following command: pecl -v install rar.
You can always download the tar.gz package and install Rar by hand:
Example #1 Rar installation
gunzip rar-xxx.tgz
tar -xvf rar-xxx.tar
cd rar-xxx
phpize
./configure && make && make install
Windows users will enable php_rar.dll inside
of php.ini in order to use these functions.
The DLL for this PECL extension
may be downloaded from either the
» PHP Downloads page or from
» http://pecl4win.php.net/