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On the command line, run the following commands:
# Add the packages.sury.org/php repository.
sudo apt-get update
sudo apt-get install -y lsb-release ca-certificates apt-transport-https curl
sudo curl -sSLo /tmp/debsuryorg-archive-keyring.deb https://packages.sury.org/debsuryorg-archive-keyring.deb
sudo dpkg -i /tmp/debsuryorg-archive-keyring.deb
sudo sh -c 'echo "deb [signed-by=/usr/share/keyrings/debsuryorg-archive-keyring.gpg] https://packages.sury.org/php/ $(lsb_release -sc) main" > /etc/apt/sources.list.d/php.list'
sudo apt-get update
# Install PHP.
sudo apt-get install -y php8.2