This is an old revision of the document!
The change that recently rocked the dev world was the sunsetting of PHP 5.x and moving PHP to version 7. (Don't ask us where version 6 is.) Also in the horizon is the trasition to newer releases of version 7.
Not that many organizations are prepared to deal with the change. So we have prepared a cheatsheet to cover some important technical changes and make it easier to people to transition to the new PHP version.