#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.
