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// *************
// Ubuntu 20
// ************* 
sudo apt install php8.1 php8.1-fpm php7.4-fpm
// omit mysql if using oracle and install the oracle plugin instead
sudo apt install -y php8.1-{opcache,intl,zip,common,redis,mbstring,sqlite3,cli,xml,curl,gd,apcu,soap,mysqlnd}
a2enmod proxy_fcgi setenvif
a2enconf php7.4-fpm
a2enconf php8.1-fpm 

// *************
// Ubuntu 20
// *************  
// this must be performed for all affected virtual hosts
vi /etc/apache2/sites-available\pcr360_prod.conf

// Add these line to the end of the virtual host (just before the </VirtualHost> tag)
// Remember to use the appropriate PHP Version for the Virtual Host

// PHP 7.4 should be mapped to the environment that is not being updated (so still requires it)
<FilesMatch \.php$>
SetHandler "proxy:unix:/var/run/php/php7.4-fpm.sock|fcgi://localhost"
</FilesMatch>

// PHP 8.1 should be mapped to the environment being updated
<FilesMatch \.php$>
SetHandler "proxy:unix:/var/run/php/php8.1-fpm.sock|fcgi://localhost"
</FilesMatch>