------ redis安装，启动服务，开机启动，打开redis客户端 ------

yum install -y redis

systemctl start redis

systemctl enable redis

redis-cli

------ 安装phpredis ------

pecl install redis-2.2.3

extension_dir = "/usr/lib64/php/modules/"

extension=redis.so

------ 测试 ------

<?php

   //Connecting to Redis server on localhost

   $redis = new Redis();

   $redis->connect('127.0.0.1', 6379);

   echo "Connection to server sucessfully";

   //check whether server is running or not

   echo "Server is running: " . $redis->ping();

?>