Install PHP 5.6 on Debian 10

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
apt-get update
apt-get install php5.6-{cgi,cli,fpm,pdo,gd,mbstring,mysqlnd,opcache,xml,zip}