View source for Downgrading to PHP 7.4

==Downgrading from php8.0 to PHP7.4==
// Enable PPA for PHP 7.4 in your system and install it.

 add-apt-repository ppa:ondrej/php
 sudo apt-get update
 
 sudo apt-get install php7.4
 sudo apt-get install php7.4-cli php7.4-common php7.4-json php7.4-opcache php7.4-mysql php7.4-mbstring  php7.4-zip php7.4-fpm php7.4-intl php7.4-simplexml
 
// a2dismod disables the php8.0 module by removing those symlinks.
 sudo a2dismod php8.0
 
// a2enmod enables php7.4 module within the apache2 configuration.
 sudo a2enmod php7.4
 
NOTICE: To enable PHP 7.4 FPM in Apache2 do:

 a2enmod proxy_fcgi setenvif

 a2enconf php7.4-fpm

// Restart apache2 service.
 sudo service apache2 restart  
 
// Set alternative name path.
 sudo update-alternatives --set php /usr/bin/php7.4
 sudo update-alternatives --set phar /usr/bin/phar7.4
 sudo update-alternatives --set phar.phar /usr/bin/phar.phar7.4
 sudo update-alternatives --set phpize /usr/bin/phpize7.4
 sudo update-alternatives --set php-config /usr/bin/php-config7.4