PHP V7 & CMSB v3.05
It's high on our list, but no ETA.
Other users have reported luck using this extension as a stopgap measure for any code using the legacy mysql functions:
With these commands to install:
git clone https://github.com/php/pecl-database-mysql mysql --recursive
sudo make install
Personally I like to wait a little bit after a major new PHP release, but it is high on our list to be done soon.