selma@pc10:~$ sudo a2enmod php5.6
Considering dependency mpm_prefork for php5.6:
Considering conflict mpm_event for mpm_prefork:
Considering conflict mpm_worker for mpm_prefork:
Module mpm_prefork already enabled
Considering conflict php5 for php5.6:
Enabling module php5.6.
To activate the new configuration, you need to run:
  systemctl restart apache2
selma@pc10:~$ sudo systemctl restart apache2
selma@pc10:~$