How to change the php version used?

Question

PHP

I'm trying to install phpBB, it says You are running an unsupported PHP version. Please upgrade to PHP
7.1.3 or higher before trying to install or update to phpBB 3.3 2018 Zend Technologies But the forum still does not install and writes that the version needs to be updated. How to be?

Answer 1

sudo apt remove php*
sudo apt purge php*
sudo apt autoremove
sudo apt install php7.4 php7.4-{xdebug,mysql,mbstring}
sudo systemctl restart apache2

Answer 2

Adding a PHP repository to install the latest version:

cd /etc/apt/sources.list.d; echo "deb http://ppa.launchpad.net/ondrej/php/ubuntu $(lsb_release -cs) main" | sudo tee php.list > /dev/null; sudo apt-key adv --recv-keys --keyserver hkps://keyserver.ubuntu.com:443 4F4EA0AAE5267A6C; sleep 10; sudo apt update; cd

And then already 7.4 in the php name can not be registered.
It will automatically pull up the latest versions of the packages.