How to install php5 on ubuntu 16.04

ubuntu16.04安装php5的方法：首先移除默认及已安装的PHP包；然后添加PPA；最后通过“sudo apt-get install php5.6”安装php5.6即可。

本文操作环境：ubuntu16.04系统、PHP5.6版，DELL G3电脑

ubuntu 16.04 php5 环境搭建

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

添加 PPA

sudo add-apt-repository ppa:ondrej/php
   
add-apt-repository: command not found
sudo apt-get install software-properties-common python-software-properties

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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

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