How can I downgrade from PHP 7 to PHP 5.6 on Ubuntu 16.04?

Standard

Assuming libapache2-mod-php is a suitable way to enable PHP in Apache for you, you can proceed in this way:

sudo add-apt-repository ppa:ondrej/php
sudo apt-get update
sudo apt-get install php7.0 php5.6 php5.6-mysql php-gettext php5.6-mbstring php-mbstring php7.0-mbstring php-xdebug libapache2-mod-php5.6 libapache2-mod-php7.0

yes ” | sudo update-alternatives –force –all

Switching PHP VERSION:

  • From php5.6 to php7.0:
    • Apache:
      sudo a2dismod php5.6 ; sudo a2enmod php7.0 ; sudo service apache2 restart
      
    • CLI:
      sudo update-alternatives --set php /usr/bin/php7.0
      
  • From php7.0 to php5.6:
    • Apache:
      sudo a2dismod php7.0 ; sudo a2enmod php5.6 ; sudo service apache2 restart
      
    • CLI:
      sudo update-alternatives --set php /usr/bin/php5.6

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