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======== install php-redis manual on Ubuntu 16.04 ========
# clone php-redis package from github
git clone https://github.com/phpredis/phpredis.git
mv phpredis/ /etc/
cd /etc/phpredis
# (* 如果 phpize 未安装, sudo apt -y install php7.1-dev)
phpize
./configure
sudo make && make install

# 在 php.ini 写入 extenion=redis.so 或者在 /etc/php/7.1/fpm/conf.d/redis.ini 写入 extension=/etc/phpredis/modules/redis.so
# sudo vi /etc/php/7.1/fpm/php.ini
# 重启php-fpm
sudo systemctl restart php7.1-fpm.service