Downgrading to PHP 7.4

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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
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