Upgrade AWS Elastic Beanstalk from PHP7.0 to PHP7.1
The AWS Elastic Beanstalk Console currently allows you to change between minor platform versions (e.g. from 2017.09 v2.6.1 running PHP 7.0 to 2017.09 v2.6.2 running PHP 7.0), but doesn’t support changes between major versions (e.g. from 2017.09 v2.6.2 running PHP 7.0 to 2017.09 v2.6.2 running PHP 7.1).