PHP 5.6 end of life
PHP.net will end support for PHP 5.6 in December 2018. As a result, Acquia is ending support for PHP 5.6 in favor of PHP 7.1 on Monday, 1 October 2018. At that time, we will remove PHP 5.6 and convert all remaining environments to PHP 7.1. This deadline will not be extended, as it is critical your website be upgraded to ensure its continued security.