从https://github.com/phpredis/phpredis下载redis扩展包

$ wget -O phpredis-master.zip https://github.com/phpredis/phpredis/archive/master.zip
$ unzip phpredis-master.zip
$ cd phpredis-master
$ /usr/local/php/bin/phpize
$ ./configure --with-php-config=/usr/local/php/bin/php-config
$ make && make install

$ vim /usr/local/php/etc/php.ini

增加一行

extension = "redis.so"

重启PHP服务