Debian 10 Buster has PHP 7.3 as the default version installable. The only per-requisite for this setup is per-installed Debian 10 and user account with suds access.
Step 1: Update system
As always, updating software repositories and installed packages to sync with latest releases.
sudo apt update && sudo apt -y upgrade
Step 2: Install PHP / PHP 7.3 on Debian 10 Buster
The next step is installation of PHP 7.3 on Debian 10. Run the following commands on your Debian 10 terminal to install PHP 7.3.
sudo apt -y install php php-common
Step 3: Installing PHP Extensions on Debian 10 Buster
PHP extensions can be installed on demand. Here I’ll show installation of most common PHP extensions required for basic usage.
sudo apt -y install php-cli php-fpm php-json php-pdo php-mysql php-zip php-gd php-mbstring php-curl php-xml php-pear php-bcmath
Step 4: Using PHP with Apache Web Server
You need to have installed Apache Web Server,
Then install libapache2-mod-php
sudo apt -y install libapache2-mod-php
Enable Apache module if not already enabled then restart the Web Server.
sudo a2enmod php7.3
sudo systemctl restart apache2
There you have it. PHP 7.3 has been installed on Debian 10 (Buster).