I have installed Joomla and I want use Redis or Memcached for the cache management, but Joomla permits only the "File" option for managing the cache. I can see that don't exist "php_redis.dll" or "php_memcached.dll" in "\ext" directory of the PHP and for this reason Joomla not propose Redis or Memcached for manage the cache.

Then... How to get this modules for PHP?

Thank you for help!