# Switch from PHP7.x to PHP7.x
sudo a2dismod php7.1
sudo a2enmod php7.3

#To activate the new configuration, you need to run:
systemctl restart apache2

sudo update-alternatives --set php /usr/bin/php7.3
sudo update-alternatives --set phar /usr/bin/phar7.3
sudo update-alternatives --set phar.phar /usr/bin/phar.phar7.3
sudo update-alternatives --set phpize /usr/bin/phpize7.3
sudo update-alternatives --set php-config /usr/bin/php-config7.3