switch PHP version from 8.0 to 7.4  on ubuntu

sudo a2dismod php8.0
sudo a2enmod php7.4
sudo service apache2 restart

sudo a2dismod php7.4
sudo a2enmod php8.0
sudo service apache2 restart
sudo update-alternatives --config php
sudo update-alternatives --config phar
sudo update-alternatives --config phar.phar
sudo service apache2 restart