服务器环境从PHP5升级到PHP7

#安装ppa

sudo apt-get install python-software-properties software-properties-common

sudo add-apt-repository ppa:ondrej/php-7.0

sudo apt-get update

#删除php5

sudo apt-get purge php5-fpm php5-mysql php5-common

sudo apt-get --purge autoremove

#安装php7

sudo apt-get install php7.0-fpm php7.0-mysql php7.0-common php7.0-curl

#把nginx *.conf 里的fastcgi_pass配置改成：
fastcgi_pass unix:/run/php/php7.0-fpm.sock;

#重启nginx

sudo service nginx reload

#完成.