ubuntu 16 php7 降级 php5.6

sudo dpkg -l | grep php| awk '{print $2}' |tr "\n" " "
sudo apt-get install aptitude
sudo aptitude purge `dpkg -l | grep php| awk '{print $2}' |tr "\n" " "`
sudo add-apt-repository ppa:ondrej/php
sudo apt-get update
sudo apt-get install php5.6
sudo apt-get install php5.6-gd php5.6-mysql libapache2-mod-php5.6
a2enmod php5.6
systemctl restart apache2