Quick Public Safety Announcement, PHP 5.6 goes end of life (EOL) on the 31 December 2018. This means that known security flaws will no longer be being fixed so any sites you have running on it will become vulnerable, hence it is important you update them to a newer version.
We recommend updating to the latest stable version (at the time of writing this is PHP 7.2). As this is a major upgrade you will want to test your site on the new version and may need to get your developers to update some code before moving over.
If you’re unsure if you are affected or want a hand upgrading? Get in touch!
Everyone loves a good graph and Jordi Boggiano has provided this great overview of the PHP versions out there in the wild!