When finish.

Stop old php and remove

systemctl stop php-fpm.service

apt update

 Add SURY PHP PPA repository

apt -y install lsb-release apt-transport-https ca-certificates

wget -O /etc/apt/trusted.gpg.d/php.gpg https://packages.sury.org/php/apt.gpg

echo "deb https://packages.sury.org/php/ $(lsb_release -sc) main" | sudo tee /etc/apt/sources.list.d/php.list

apt update

apt install php7.4 php7.4-fpm php7.4-mysql php7.4-xml php7.4-zip php7.4-json php7.4-common

enable extension

If you want to show error message

restart php7.4

modify websit configuration.php

open browser and only display Error

modify configuration.php error_reporting default to maximum

<---typo

and refresh again

modify configuration.php apc to PHP or database

and website up and normal.

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