Install PHP7.3 on Debian 10

1,使用 https://deb.sury.org/ 提供的DPA（Debian包存档）：

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

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

sh -c 'echo "deb https://packages.sury.org/php/ $(lsb_release -sc) main" > /etc/apt/sources.list.d/php.list'

apt update && apt upgrade -y

2,查看是否存在 PHP7.3：

apt-cache search php7.3

3,安装自己需要的软件包：

apt install php7.3 php7.3-common php7.3-cli php7.3-fpm  php7.3-mysql

4,给 NGINX 授权：

usermod -a -G www-data nginx

5,重启 PHP7.3 & NGINX

systemctl restart php7.3-fpm

systemctl restart nginx.service