Update and install php7 on lubuntu

PHP 7.1 is the latest stable release of PHP. Say thanks to Ondřej Surý for maintaining PPA of most the popular PHP versions on launchpad. If you want to install specific version of php, then this article can be helpful for you. This article will help you to install PHP 7.1 & PHP 7.0 on Ubuntu 16.10, 16.04 & 14.04 using PPA

Install PHP 7.1

Use the following set of commands to add PPA for PHP 7 in your Ubuntu system and install it.

$ sudo apt-get install python-software-properties
$ sudo add-apt-repository ppa:ondrej/php
$ sudo apt-get update
$ sudo apt-get install -y php7.1

Now use the following command to check installed php version on your system.

$ php -v 

PHP 7.1.0-5+deb.sury.org~xenial+1 (cli) ( NTS )
Copyright (c) 1997-2016 The PHP Group
Zend Engine v3.1.0-dev, Copyright (c) 1998-2016 Zend Technologies
    with Zend OPcache v7.1.0-5+deb.sury.org~xenial+1, Copyright (c) 1999-2016, by Zend Technologies

Install PHP 7.0

Use the following set of commands to add PPA for PHP 7 in your Ubuntu system and install it.

$ sudo apt-get install python-software-properties
$ sudo add-apt-repository ppa:ondrej/php
$ sudo apt-get update
$ sudo apt-get install -y php7.0

Now use the following command to check installed php version on your system.

$ php -v 

PHP 7.0.14-2+deb.sury.org~xenial+1 (cli) ( NTS )
Copyright (c) 1997-2016 The PHP Group
Zend Engine v3.0.0, Copyright (c) 1998-2016 Zend Technologies
    with Zend OPcache v7.0.14-2+deb.sury.org~xenial+1, Copyright (c) 1999-2016, by Zend Technologies

Install PHP 7 Modules

You may also need to install modules based on your application requirements. Use the following command to find our available php 7 modules.

$ sudo apt-cache search php7-* 

php-all-dev - package depending on all supported PHP development packages
php7.0 - server-side, HTML-embedded scripting language (metapackage)
php7.0-cgi - server-side, HTML-embedded scripting language (CGI binary)
php7.0-cli - command-line interpreter for the PHP scripting language
php7.0-common - documentation, examples and common module for PHP
php7.0-curl - CURL module for PHP
php7.0-dev - Files for PHP7.0 module development
php7.0-gd - GD module for PHP
php7.0-gmp - GMP module for PHP
...
...
...
php7.1-xml - DOM, SimpleXML, WDDX, XML, and XSL module for PHP
php7.1-xmlrpc - XMLRPC-EPI module for PHP
php7.1-zip - Zip module for PHP
php7.1-opcache - Zend OpCache module for PHP
php7.1 - server-side, HTML-embedded scripting language (metapackage)
php7.1-xsl - XSL module for PHP (dummy)

Now install modules which is required for you.

$ sudo apt-get install php7.0-mysql php7.0-curl php7.0-json php7.0-cgi