# yum --enablerepo=epel install php-pecl-redis


Installed:
  php-pecl-redis.x86_64 0:2.2.8-1.el6

Dependency Installed:
  php-cli.x86_64 0:5.3.3-48.el6_8   php-common.x86_64 0:5.3.3-48.el6_8   php-pear.noarch 1:1.9.4-5.el6   php-pecl-igbinary.x86_64 0:1.2.1-1.el6

Complete!

# redis-cli ping
PONG

# vi /etc/php.ini


;session.save_handler = files
session.save_handler = redis

;session.save_path = "/var/lib/php/session"
session.save_path = "tcp://localhost:6379"

# service httpd restart

# vi redis_session_test.php

<?php
session_start();

echo "save_handler=" . ini_get("session.save_handler") . "\n";
echo "save_path=" . ini_get("session.save_path") . "\n";
echo "session_id=" . session_id() . "\n";

$_SESSION['libname'] = "PhpRedis";

# php redis_session_test.php

save_handler=redis
save_path=tcp://localhost:6379
session_id=2eu2qe11sqod2t6grbqba3c1g0

# redis-cli

127.0.0.1:6379> keys *
1) "PHPREDIS_SESSION:2eu2qe11sqod2t6grbqba3c1g0"