3.1 is fully compatible with PHP 7 - so you might as well upgrade to PHP 7 at that stage if you wish.
If you are using non-core (optional) plugins then you should be aware that they may never have been tested (and/or may not work) with PHP 7.
3.1 is fully compatible with PHP 7 - so you might as well upgrade to PHP 7 at that stage if you wish.
If you are using non-core (optional) plugins then you should be aware that they may never have been tested (and/or may not work) with PHP 7.