On his site Derick Rethans has posted an announcement about a major change in the Xdebug project (a widely used PHP debugger) he leads, saying goodby to PHP 5.
A few days ago I merged a patch into on GitHub. Maintaining PHP 5 and PHP 7 support in one code base is not particularly easy, and even more complicated for something like Xdebug, with its deep interactions with PHP's internals.
As PHP 5.6's active support has ended on December 31st, I also felt it no longer needed to support PHP 5 with Xdebug any more. It saves more than 5000 lines of code.
He shares some of the responses to the change (via Tweets) from the community ranging from full support to outcry over the change. He points out that the current version of Xdebug (2.5) will continue to operate on PHP 5 systems but when Xdebug 2.6 rolls around, the 2.5 branch will only receive bugfixes and no new features. You can find out about those upcoming features here.