The new PHP version should be active now.After a successful installation, we can disable the old 7.2 and then enable 7.3:.
Then install the required PHP packages based on your current installation:. After completing the update, we need to install the PHP 7.3. In order to install PHP 7.3, we need to add the repository first:. So that we can revert to the older versions if something incompatible with the new one after switching. Here we have provided the steps to upgrade the current PHP 7.2 version to 7.3 on Ubuntu 14/16/18 versions without removing the old one. In this tutorial, we will learn how to install FFmpeg 4 on Ubuntu 16.04 from a PPA (Personal Package Archive). 
As a part of increasing the security, it is advised to keep your PHP version up to date. If you try to install FFmpeg using the package manager on Ubuntu 16.04 you will notice that the newest version it will give you is 2.8.11, which is a long way off from the latest version.
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