How to Switch Between PHP Versions on Ubuntu 16.04 Command Line?

Switching PHP Versions on Ubuntu 16.04 Command Line

Problem:
When running the internal PHP web server on the command line with php -S localhost:8888, PHP requests are handled using PHP version 7, despite enabling PHP 5.6 in Apache modules. How to switch between PHP versions on the command line?

Interactive Switching:
Use the following commands to interactively switch PHP versions:

sudo update-alternatives --config php
sudo update-alternatives --config phar
sudo update-alternatives --config phar.phar

Manual Switching:

From PHP 5.6 to PHP 7.1:

• Apache:

  $ sudo a2dismod php5.6
  $ sudo a2enmod php7.1
  $ sudo service apache2 restart

• Command Line:

  $ sudo update-alternatives --set php /usr/bin/php7.1
  $ sudo update-alternatives --set phar /usr/bin/phar7.1
  $ sudo update-alternatives --set phar.phar /usr/bin/phar.phar7.1

  From PHP 7.1 to PHP 5.6:

• Apache:

  $ sudo a2dismod php7.1
  $ sudo a2enmod php5.6
  $ sudo service apache2 restart

• Command Line:

  $ sudo update-alternatives --set php /usr/bin/php5.6

Source:
https://www.digitalocean.com/community/tutorials/how-to-switch-between-multiple-php-versions-on-ubuntu-16-04

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