ubuntu 16.04上安装php5.6

php --ini

按下面的步骤，在ubuntu 16.04上面安装成功了 php5.6

dpkg -l | grep php| awk '{print $2}' |tr " " " "
apt-get install aptitude
aptitude purge `dpkg -l | grep php| awk '{print $2}' |tr " " " "`
add-apt-repository ppa:ondrej/php
apt-get update
apt-get install php5.6
php -v
vim /etc/nginx/sites-enabled/default
which php
ls /run/php/
ls /run/php/ -al
fg
apt-get install php
php -v
history
apt-get install php5.6-fpm
netstat -tnelp
netstat -atunp
ps aux|grep php
netstat -atunp
netstat -atunp|grep 9000

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Ubuntu 16.04默认安装php7.0环境，但是php7目前兼容性并不是很好，如果自行安装php5需要清除php7的已安装包，否则会报错。

移除默认及已安装的PHP包

sudo dpkg -l | grep php| awk '{print $2}' |tr " " " "
sudo apt-get install aptitude
sudo aptitude purge `dpkg -l | grep php| awk '{print $2}' |tr " " " "`

添加 PPA
sudo add-apt-repository ppa:ondrej/php

安装php5.6
sudo apt-get update
sudo apt-get install php5.6

安装扩展
sudo apt-get install php5.6-gd
sudo apt-get install php5.6-mysql