How to switch between php versions

 Install/upgrade php switch between php versions

sudo a2dismod php8.0

systemctl restart apache2

sudo a2enmod php7.4

systemctl restart apache2

$ sudo update-alternatives --set php /usr/bin/php7.4

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if a2dismod php8.2 throws  error : php8.2 module cannot be found

run below command to install it

sudo apt-get install libapache2-mod-php8.2

Then a2dismod php8.2 will work  

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References:

https://www.cloudbooklet.com/how-to-upgrade-php-version-to-php-8-0-on-ubuntu/