# apt-get install apt-transport-https lsb-release 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" > /etc/apt/sources.list.d/php.list
# apt-get update

Then use apt-get install to install one of these:

• php5.6
• php7.0
• php7.1
• php7.2
• php7.3
• php7.4