php7.1 -> 7.0 다운그레이드

sudo apt-get remove php7.1-fpm

sudo apt-get remove php7.1-mysql

sudo apt-get autoremove libvpx1 php7.1-cli php7.1-json php7.1-opcache php7.1-readline

sudo apt-update


sudo apt-get install php7.0-fpm

sudo apt-get install php7.0-mysql


nginx 설정에 반영. 
/etc/nginx/sites-enabled/default 

여기서 php 경로를 7.0으로 변경

fastcgi_pass unix:/var/run/php7.0-fpm.sock;

sudo service nginx reload


sudo apt-get autoremove php-xml

sudo apt-get install php7.0-xml


sudo apt-get autoremove php-gd

sudo apt-get install php7.0-gd


AND