a2enmod php7.1
Considering dependency mpm_prefork for php7.1:
Considering conflict mpm_event for mpm_prefork:
Considering conflict mpm_worker for mpm_prefork:
Module mpm_prefork already enabled
Considering conflict php5 for php7.1:
Enabling module php7.1.
To activate the new configuration, you need to run:
  service apache2 restart