disable current php and enable php with passed version, usage `$ switch-php 7.4` save this in your ~/.bashrc

gistfile1.txt

#disable current php and enable php with passed version
function switch-php {
  sudo a2dismod php$(php -v | grep -o -E '[0-9.]+' -m 1 | cut -c 1-3 | head -n 1);
  sudo a2enmod php$1;
  sudo update-alternatives --set php /usr/bin/php$1;
  sudo update-alternatives --set phar /usr/bin/phar$1;
  sudo update-alternatives --set phar.phar /usr/bin/phar.phar$1;
  sudo update-alternatives --set phpize /usr/bin/phpize$1;
  sudo update-alternatives --set php-config /usr/bin/php-config$1;
  sudo service apache2 restart;
}