How to install php5 on ubuntu 16.04

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
   
add-apt-repository: command not found
sudo apt-get install software-properties-common python-software-properties

<br><br><br>
如果不行，apt-get update     apt-get upgrade
 
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
 
安装Apache2
sudo apt install apache2
sudo apt-get install libapache2-mod-php5.6
 
安装MySQL
sudo apt install mysql-server php5.6-mysql
这里输入两次密码
sudo apt-get install mysql-client