lnmp Fatal error: Uncaught Error: Class 'Redis' not found

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搬运，写的不错！
https://blog.51cto.com/leoheng/2162621
https://stackoverflow.com/questions/24858704/phpredis-errors-class-redis-not-found-in-linux

测试安装是否成功代码：

php -r "if (new Redis() == true){ echo \"\r\n OK \r\n\"; }"