1. 徹底刪除nginx：
sudo apt-get remove nginx nginx-common
sudo apt-get purge nginx nginx-common
sudo apt-get autoremove
sudo apt-get remove nginx-full nginx-common
2. 徹底刪除apache
sudo apt-get --purge remove apache2
sudo apt-get --purge remove apache2.2-common
sudo apt-get autoremove
sudo find /etc -name "*apache*" -exec rm -rf {} \;
sudo rm -rf /var/www
3. 徹底刪除php
sudo apt-get autoremove php7*
sudo find /etc -name "*php*" |xargs rm -rf
sudo apt purge `dpkg -l | grep php| awk '{print $2}' |tr "\n" " "`
dpkg -l | grep php7.0