// Install php-redis extension
$ yum --enablerepo=remi,remi-test install php-redis

// If it does not work, try the following steps:
$ wget https://github.com/nicolasff/phpredis/zipball/master -O phpredis.zip
$ unzip phpredis.zip
$ cd nicolasff-phpredis-*
$ phpize
$ ./configure
$ make
$ make install
	Installing shared extensions:     /usr/lib64/php/modules/