We have a strange problem - PHP 5.6.x has a bug that leads to crash in our code. And it is a result of the stupid API change, they refuse to fix it in 5.6.x branch, and since there seems to be no PHP 5.7 it means our plugins should be installed on PHP 7 only for later Moodle versions.
Can we specify PHP version requirements for our release to exclude PHP 5.6.x somehow? And for people running PHP 5.6.x to avoid updating their installation (otherwise they'll lose function - automatic update can be devastating). I have seen PHP version fields in Moodle plugin database, but do not know are they actually checked and enforced during installation or just informational.