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

Switch PHP Versions on Command Line in Ubuntu 16.04

When managing multiple PHP versions on Ubuntu 16.04, it's often necessary to switch between them in the command line. While Apache allows for easy version switching through module management, the internal PHP web server presents a unique challenge.

Interactive Switching Mode

To interactively switch PHP versions, use the following commands:

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

This will present you with a list of available PHP versions and allow you to select the desired one.

Manual Switching

From PHP 5.6 to PHP 7.1

For Apache, run these commands:

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

For the command line, execute:

$ 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

For Apache, run these commands:

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

For the command line, execute:

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

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