Redis database is a powerful and easy tool to use inside all kind of application.
If you are planning to use it inside php application you need to install a php module to acces to his structures; the only (not really) problem is that you have to build your module on your own.
Above you can find the procedure to keep it fully functional inside a CentoS System (6.6 in this case).
Install php-devel module to have ability of build php module from source code
yum install php-devel
Download the module source code
git clone https://github.com/phpredis/phpredis.git
Compile and install it
cd phpredis phpize ./configure make make install
Once you have installed, you have to modify your php.ini to load extension during startup phase you can do this adding the row
#Dynamic extension extension=redis.so
and you will be able to view extension loaded from your phpinfo().
If you need this precedure for Xamp installed on Ubuntu you can click on