We have recently published a blog post regarding the end-of-life for PHP 5.6 and 7.0.
Please take a moment to read it. It includes important information about to help you with testing and preparing your site for upgrading to PHP 7.2.
We are planning to remove support for PHP 5.6 and 7.0 on April 1 2019, but this date may change.
If you have any questions or concerns, please open a support ticket.