Setup PHP on Ubuntu

Please check these links

LAMP
LAMP how to

To install PHP 7 on Ubuntu 
sudo apt-get -y update
sudo add-apt-repository ppa:ondrej/php
sudo apt-get -y update
sudo apt-get install -y php7.0 libapache2-mod-php7.0 php7.0 php7.0-common php7.0-gd php7.0-mysql php7.0-mcrypt php7.0-curl php7.0-intl php7.0-xsl php7.0-mbstring php7.0-zip php7.0-bcmath php7.0-iconv php7.0-soap 

 
PHP install guide

to Upgrade to PHP7
PHP7

 If an "PHP ERROR: Module php7.0 does not exist" occur

PHP ERROR

to install PHPmyAdmin

sudo apt-get install phpmyadmin
phpMyAdmin