PHP 7.3 for Ubuntu and Debian is available from ondrej/php PPA repository. PHP 7.3 stable version has been released with many new features and bug fixes. Always get the latest news from PHP releases news.

Step 1: Add PHP 7.3 PPA

Add ondrej/php which has PHP 7.3 package and other required PHP extensions.

sudo add-apt-repository ppa:ondrej/php
sudo apt update

This PPA can be added to your system manually by copying the lines below and adding them to your system’s software sources.

Step 2: Install PHP 7.3

Once the PPA repository has been added, install php 7.3 on your Ubuntu 18.04 / Ubuntu 16.04 server.

sudo apt install php7.3

Step 3: Installing PHP 7.3 Extensions

Install PHP 7.3 extensions by using the syntax

sudo apt install php7.3-<entension-name>

Step 4: Restart Web server

You may need to restart your Web server after installation of PHP.

# Apache
sudo service apache2 restart

# Nginx
sudo service nginx restart

Enjoy using PHP 7.3 on Ubuntu 18.04 / Ubuntu 16.04 LTS.